register-task-definition¶

Description¶

Registers a new task definition from the supplied family and containerDefinitions . Optionally, you can add data volumes to your containers with the volumes parameter. For more information about task definition parameters and defaults, see Amazon ECS Task Definitions in the Amazon Elastic Container Service Developer Guide .

You can specify an IAM role for your task with the taskRoleArn parameter. When you specify an IAM role for a task, its containers can then use the latest versions of the AWS CLI or SDKs to make API requests to the AWS services that are specified in the IAM policy associated with the role. For more information, see IAM Roles for Tasks in the Amazon Elastic Container Service Developer Guide .

You can specify a Docker networking mode for the containers in your task definition with the networkMode parameter. The available network modes correspond to those described in Network settings in the Docker run reference. If you specify the awsvpc network mode, the task is allocated an elastic network interface, and you must specify a NetworkConfiguration when you create a service or run a task with the task definition. For more information, see Task Networking in the Amazon Elastic Container Service Developer Guide .

Synopsis¶

  register-task-definition
--family <value>
[--task-role-arn <value>]
[--execution-role-arn <value>]
[--network-mode <value>]
--container-definitions <value>
[--volumes <value>]
[--placement-constraints <value>]
[--requires-compatibilities <value>]
[--cpu <value>]
[--memory <value>]
[--tags <value>]
[--pid-mode <value>]
[--ipc-mode <value>]
[--proxy-configuration <value>]
[--inference-accelerators <value>]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options¶

--family (string)

You must specify a family for a task definition, which allows you to track multiple versions of the same task definition. The family is used as a name for your task definition. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed.

--task-role-arn (string)

The short name or full Amazon Resource Name (ARN) of the IAM role that containers in this task can assume. All containers in this task are granted the permissions that are specified in this role. For more information, see IAM Roles for Tasks in the Amazon Elastic Container Service Developer Guide .

--execution-role-arn (string)

The Amazon Resource Name (ARN) of the task execution role that grants the Amazon ECS container agent permission to make AWS API calls on your behalf. The task execution IAM role is required depending on the requirements of your task. For more information, see Amazon ECS task execution IAM role in the Amazon Elastic Container Service Developer Guide .

--network-mode (string)

The Docker networking mode to use for the containers in the task. The valid values are none , bridge , awsvpc , and host . If no network mode is specified, the default is bridge .

For Amazon ECS tasks on Fargate, the awsvpc network mode is required. For Amazon ECS tasks on Amazon EC2 instances, any network mode can be used. If the network mode is set to none , you cannot specify port mappings in your container definitions, and the tasks containers do not have external connectivity. The host and awsvpc network modes offer the highest networking performance for containers because they use the EC2 network stack instead of the virtualized network stack provided by the bridge mode.

With the host and awsvpc network modes, exposed container ports are mapped directly to the corresponding host port (for the host network mode) or the attached elastic network interface port (for the awsvpc network mode), so you cannot take advantage of dynamic host port mappings.

Warning

When using the host network mode, you should not run containers using the root user (UID 0). It is considered best practice to use a non-root user.

If the network mode is awsvpc , the task is allocated an elastic network interface, and you must specify a NetworkConfiguration value when you create a service or run a task with the task definition. For more information, see Task Networking in the Amazon Elastic Container Service Developer Guide .

Note

Currently, only Amazon ECS-optimized AMIs, other Amazon Linux variants with the ecs-init package, or AWS Fargate infrastructure support the awsvpc network mode.

If the network mode is host , you cannot run multiple instantiations of the same task on a single container instance when port mappings are used.

Docker for Windows uses different network modes than Docker for Linux. When you register a task definition with Windows containers, you must not specify a network mode. If you use the console to register a task definition with Windows containers, you must choose the <default> network mode object.

For more information, see Network settings in the Docker run reference .

Possible values:

bridge

host

awsvpc

none

--container-definitions (list)

A list of container definitions in JSON format that describe the different containers that make up your task.

(structure)

Container definitions are used in task definitions to describe the different containers that are launched as part of a task.

name -> (string)

The name of a container. If you are linking multiple containers together in a task definition, the name of one container can be entered in the links of another container to connect the containers. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed. This parameter maps to name in the Create a container section of the Docker Remote API and the --name option to docker run .

image -> (string)

The image used to start a container. This string is passed directly to the Docker daemon. Images in the Docker Hub registry are available by default. Other repositories are specified with either `` repository-url /image :tag `` or `` repository-url /image @*digest* `` . Up to 255 letters (uppercase and lowercase), numbers, hyphens, underscores, colons, periods, forward slashes, and number signs are allowed. This parameter maps to Image in the Create a container section of the Docker Remote API and the IMAGE parameter of docker run .

When a new task starts, the Amazon ECS container agent pulls the latest version of the specified image and tag for the container to use. However, subsequent updates to a repository image are not propagated to already running tasks.

Images in Amazon ECR repositories can be specified by either using the full registry/repository:tag or registry/repository@digest . For example, 012345678910.dkr.ecr.<region-name>.amazonaws.com/<repository-name>:latest or 012345678910.dkr.ecr.<region-name>.amazonaws.com/<repository-name>@sha256:94afd1f2e64d908bc90dbca0035a5b567EXAMPLE .

Images in official repositories on Docker Hub use a single name (for example, ubuntu or mongo ).

Images in other repositories on Docker Hub are qualified with an organization name (for example, amazon/amazon-ecs-agent ).

Images in other online repositories are qualified further by a domain name (for example, quay.io/assemblyline/ubuntu ).

repositoryCredentials -> (structure)

The private repository authentication credentials to use.

credentialsParameter -> (string)

The Amazon Resource Name (ARN) of the secret containing the private repository credentials.

Note

When you are using the Amazon ECS API, AWS CLI, or AWS SDK, if the secret exists in the same Region as the task that you are launching then you can use either the full ARN or the name of the secret. When you are using the AWS Management Console, you must specify the full ARN of the secret.

cpu -> (integer)

The number of cpu units reserved for the container. This parameter maps to CpuShares in the Create a container section of the Docker Remote API and the --cpu-shares option to docker run .

This field is optional for tasks using the Fargate launch type, and the only requirement is that the total amount of CPU reserved for all containers within a task be lower than the task-level cpu value.

Note

You can determine the number of CPU units that are available per EC2 instance type by multiplying the vCPUs listed for that instance type on the Amazon EC2 Instances detail page by 1,024.

Linux containers share unallocated CPU units with other containers on the container instance with the same ratio as their allocated amount. For example, if you run a single-container task on a single-core instance type with 512 CPU units specified for that container, and that is the only task running on the container instance, that container could use the full 1,024 CPU unit share at any given time. However, if you launched another copy of the same task on that container instance, each task would be guaranteed a minimum of 512 CPU units when needed, and each container could float to higher CPU usage if the other container was not using it, but if both tasks were 100% active all of the time, they would be limited to 512 CPU units.

On Linux container instances, the Docker daemon on the container instance uses the CPU value to calculate the relative CPU share ratios for running containers. For more information, see CPU share constraint in the Docker documentation. The minimum valid CPU share value that the Linux kernel allows is 2. However, the CPU parameter is not required, and you can use CPU values below 2 in your container definitions. For CPU values below 2 (including null), the behavior varies based on your Amazon ECS container agent version:

Agent versions less than or equal to 1.1.0: Null and zero CPU values are passed to Docker as 0, which Docker then converts to 1,024 CPU shares. CPU values of 1 are passed to Docker as 1, which the Linux kernel converts to two CPU shares.

Agent versions greater than or equal to 1.2.0: Null, zero, and CPU values of 1 are passed to Docker as 2.

On Windows container instances, the CPU limit is enforced as an absolute limit, or a quota. Windows containers only have access to the specified amount of CPU that is described in the task definition. A null or zero CPU value is passed to Docker as 0 , which Windows interprets as 1% of one CPU.

memory -> (integer)

The amount (in MiB) of memory to present to the container. If your container attempts to exceed the memory specified here, the container is killed. The total amount of memory reserved for all containers within a task must be lower than the task memory value, if one is specified. This parameter maps to Memory in the Create a container section of the Docker Remote API and the --memory option to docker run .

If using the Fargate launch type, this parameter is optional.

If using the EC2 launch type, you must specify either a task-level memory value or a container-level memory value. If you specify both a container-level memory and memoryReservation value, memory must be greater than memoryReservation . If you specify memoryReservation , then that value is subtracted from the available memory resources for the container instance on which the container is placed. Otherwise, the value of memory is used.

The Docker daemon reserves a minimum of 4 MiB of memory for a container, so you should not specify fewer than 4 MiB of memory for your containers.

memoryReservation -> (integer)

The soft limit (in MiB) of memory to reserve for the container. When system memory is under heavy contention, Docker attempts to keep the container memory to this soft limit. However, your container can consume more memory when it needs to, up to either the hard limit specified with the memory parameter (if applicable), or all of the available memory on the container instance, whichever comes first. This parameter maps to MemoryReservation in the Create a container section of the Docker Remote API and the --memory-reservation option to docker run .

If a task-level memory value is not specified, you must specify a non-zero integer for one or both of memory or memoryReservation in a container definition. If you specify both, memory must be greater than memoryReservation . If you specify memoryReservation , then that value is subtracted from the available memory resources for the container instance on which the container is placed. Otherwise, the value of memory is used.

For example, if your container normally uses 128 MiB of memory, but occasionally bursts to 256 MiB of memory for short periods of time, you can set a memoryReservation of 128 MiB, and a memory hard limit of 300 MiB. This configuration would allow the container to only reserve 128 MiB of memory from the remaining resources on the container instance, but also allow the container to consume more memory resources when needed.

The Docker daemon reserves a minimum of 4 MiB of memory for a container, so you should not specify fewer than 4 MiB of memory for your containers.

links -> (list)

The links parameter allows containers to communicate with each other without the need for port mappings. This parameter is only supported if the network mode of a task definition is bridge . The name:internalName construct is analogous to name:alias in Docker links. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed. For more information about linking Docker containers, go to Legacy container links in the Docker documentation. This parameter maps to Links in the Create a container section of the Docker Remote API and the --link option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

Warning

Containers that are collocated on a single container instance may be able to communicate with each other without requiring links or host port mappings. Network isolation is achieved on the container instance using security groups and VPC settings.

(string)

portMappings -> (list)

The list of port mappings for the container. Port mappings allow containers to access ports on the host container instance to send or receive traffic.

For task definitions that use the awsvpc network mode, you should only specify the containerPort . The hostPort can be left blank or it must be the same value as the containerPort .

Port mappings on Windows use the NetNAT gateway address rather than localhost . There is no loopback for port mappings on Windows, so you cannot access a container’s mapped port from the host itself.

This parameter maps to PortBindings in the Create a container section of the Docker Remote API and the --publish option to docker run . If the network mode of a task definition is set to none , then you can’t specify port mappings. If the network mode of a task definition is set to host , then host ports must either be undefined or they must match the container port in the port mapping.

Note

After a task reaches the RUNNING status, manual and automatic host and container port assignments are visible in the Network Bindings section of a container description for a selected task in the Amazon ECS console. The assignments are also visible in the networkBindings section DescribeTasks responses.

(structure)

Port mappings allow containers to access ports on the host container instance to send or receive traffic. Port mappings are specified as part of the container definition.

If you are using containers in a task with the awsvpc or host network mode, exposed ports should be specified using containerPort . The hostPort can be left blank or it must be the same value as the containerPort .

After a task reaches the RUNNING status, manual and automatic host and container port assignments are visible in the networkBindings section of DescribeTasks API responses.

containerPort -> (integer)

The port number on the container that is bound to the user-specified or automatically assigned host port.

If you are using containers in a task with the awsvpc or host network mode, exposed ports should be specified using containerPort .

If you are using containers in a task with the bridge network mode and you specify a container port and not a host port, your container automatically receives a host port in the ephemeral port range. For more information, see hostPort . Port mappings that are automatically assigned in this way do not count toward the 100 reserved ports limit of a container instance.

hostPort -> (integer)

The port number on the container instance to reserve for your container.

If you are using containers in a task with the awsvpc or host network mode, the hostPort can either be left blank or set to the same value as the containerPort .

If you are using containers in a task with the bridge network mode, you can specify a non-reserved host port for your container port mapping, or you can omit the hostPort (or set it to 0 ) while specifying a containerPort and your container automatically receives a port in the ephemeral port range for your container instance operating system and Docker version.

The default ephemeral port range for Docker version 1.6.0 and later is listed on the instance under /proc/sys/net/ipv4/ip_local_port_range . If this kernel parameter is unavailable, the default ephemeral port range from 49153 through 65535 is used. Do not attempt to specify a host port in the ephemeral port range as these are reserved for automatic assignment. In general, ports below 32768 are outside of the ephemeral port range.

Note

The default ephemeral port range from 49153 through 65535 is always used for Docker versions before 1.6.0.

The default reserved ports are 22 for SSH, the Docker ports 2375 and 2376, and the Amazon ECS container agent ports 51678-51680. Any host port that was previously specified in a running task is also reserved while the task is running (after a task stops, the host port is released). The current reserved ports are displayed in the remainingResources of DescribeContainerInstances output. A container instance can have up to 100 reserved ports at a time, including the default reserved ports. Automatically assigned ports don’t count toward the 100 reserved ports limit.

protocol -> (string)

The protocol used for the port mapping. Valid values are tcp and udp . The default is tcp .

essential -> (boolean)

If the essential parameter of a container is marked as true , and that container fails or stops for any reason, all other containers that are part of the task are stopped. If the essential parameter of a container is marked as false , then its failure does not affect the rest of the containers in a task. If this parameter is omitted, a container is assumed to be essential.

All tasks must have at least one essential container. If you have an application that is composed of multiple containers, you should group containers that are used for a common purpose into components, and separate the different components into multiple task definitions. For more information, see Application Architecture in the Amazon Elastic Container Service Developer Guide .

entryPoint -> (list)

Warning

Early versions of the Amazon ECS container agent do not properly handle entryPoint parameters. If you have problems using entryPoint , update your container agent or enter your commands and arguments as command array items instead.

The entry point that is passed to the container. This parameter maps to Entrypoint in the Create a container section of the Docker Remote API and the --entrypoint option to docker run . For more information, see https://docs.docker.com/engine/reference/builder/#entrypoint .

(string)

command -> (list)

The command that is passed to the container. This parameter maps to Cmd in the Create a container section of the Docker Remote API and the COMMAND parameter to docker run . For more information, see https://docs.docker.com/engine/reference/builder/#cmd . If there are multiple arguments, each argument should be a separated string in the array.

(string)

environment -> (list)

The environment variables to pass to a container. This parameter maps to Env in the Create a container section of the Docker Remote API and the --env option to docker run .

Warning

We do not recommend using plaintext environment variables for sensitive information, such as credential data.

(structure)

A key-value pair object.

name -> (string)

The name of the key-value pair. For environment variables, this is the name of the environment variable.

value -> (string)

The value of the key-value pair. For environment variables, this is the value of the environment variable.

environmentFiles -> (list)

A list of files containing the environment variables to pass to a container. This parameter maps to the --env-file option to docker run .

You can specify up to ten environment files. The file must have a .env file extension. Each line in an environment file should contain an environment variable in VARIABLE=VALUE format. Lines beginning with # are treated as comments and are ignored. For more information on the environment variable file syntax, see Declare default environment variables in file .

If there are environment variables specified using the environment parameter in a container definition, they take precedence over the variables contained within an environment file. If multiple environment files are specified that contain the same variable, they are processed from the top down. It is recommended to use unique variable names. For more information, see Specifying Environment Variables in the Amazon Elastic Container Service Developer Guide .

(structure)

A list of files containing the environment variables to pass to a container. You can specify up to ten environment files. The file must have a .env file extension. Each line in an environment file should contain an environment variable in VARIABLE=VALUE format. Lines beginning with # are treated as comments and are ignored. For more information on the environment variable file syntax, see Declare default environment variables in file .

If there are environment variables specified using the environment parameter in a container definition, they take precedence over the variables contained within an environment file. If multiple environment files are specified that contain the same variable, they are processed from the top down. It is recommended to use unique variable names. For more information, see Specifying Environment Variables in the Amazon Elastic Container Service Developer Guide .

This field is not valid for containers in tasks using the Fargate launch type.

value -> (string)

The Amazon Resource Name (ARN) of the Amazon S3 object containing the environment variable file.

type -> (string)

The file type to use. The only supported value is s3 .

mountPoints -> (list)

The mount points for data volumes in your container.

This parameter maps to Volumes in the Create a container section of the Docker Remote API and the --volume option to docker run .

Windows containers can mount whole directories on the same drive as $env:ProgramData . Windows containers cannot mount directories on a different drive, and mount point cannot be across drives.

(structure)

Details on a volume mount point that is used in a container definition.

sourceVolume -> (string)

The name of the volume to mount. Must be a volume name referenced in the name parameter of task definition volume .

containerPath -> (string)

The path on the container to mount the host volume at.

readOnly -> (boolean)

If this value is true , the container has read-only access to the volume. If this value is false , then the container can write to the volume. The default value is false .

volumesFrom -> (list)

Data volumes to mount from another container. This parameter maps to VolumesFrom in the Create a container section of the Docker Remote API and the --volumes-from option to docker run .

(structure)

Details on a data volume from another container in the same task definition.

sourceContainer -> (string)

The name of another container within the same task definition from which to mount volumes.

readOnly -> (boolean)

If this value is true , the container has read-only access to the volume. If this value is false , then the container can write to the volume. The default value is false .

linuxParameters -> (structure)

Linux-specific modifications that are applied to the container, such as Linux kernel capabilities. For more information see KernelCapabilities .

Note

This parameter is not supported for Windows containers.

capabilities -> (structure)

The Linux capabilities for the container that are added to or dropped from the default configuration provided by Docker.

Note

For tasks that use the Fargate launch type, capabilities is supported for all platform versions but the add parameter is only supported if using platform version 1.4.0 or later.

add -> (list)

The Linux capabilities for the container that have been added to the default configuration provided by Docker. This parameter maps to CapAdd in the Create a container section of the Docker Remote API and the --cap-add option to docker run .

Note

Tasks launched on AWS Fargate only support adding the SYS_PTRACE kernel capability.

Valid values: "ALL" | "AUDIT_CONTROL" | "AUDIT_WRITE" | "BLOCK_SUSPEND" | "CHOWN" | "DAC_OVERRIDE" | "DAC_READ_SEARCH" | "FOWNER" | "FSETID" | "IPC_LOCK" | "IPC_OWNER" | "KILL" | "LEASE" | "LINUX_IMMUTABLE" | "MAC_ADMIN" | "MAC_OVERRIDE" | "MKNOD" | "NET_ADMIN" | "NET_BIND_SERVICE" | "NET_BROADCAST" | "NET_RAW" | "SETFCAP" | "SETGID" | "SETPCAP" | "SETUID" | "SYS_ADMIN" | "SYS_BOOT" | "SYS_CHROOT" | "SYS_MODULE" | "SYS_NICE" | "SYS_PACCT" | "SYS_PTRACE" | "SYS_RAWIO" | "SYS_RESOURCE" | "SYS_TIME" | "SYS_TTY_CONFIG" | "SYSLOG" | "WAKE_ALARM"

(string)

drop -> (list)

The Linux capabilities for the container that have been removed from the default configuration provided by Docker. This parameter maps to CapDrop in the Create a container section of the Docker Remote API and the --cap-drop option to docker run .

Valid values: "ALL" | "AUDIT_CONTROL" | "AUDIT_WRITE" | "BLOCK_SUSPEND" | "CHOWN" | "DAC_OVERRIDE" | "DAC_READ_SEARCH" | "FOWNER" | "FSETID" | "IPC_LOCK" | "IPC_OWNER" | "KILL" | "LEASE" | "LINUX_IMMUTABLE" | "MAC_ADMIN" | "MAC_OVERRIDE" | "MKNOD" | "NET_ADMIN" | "NET_BIND_SERVICE" | "NET_BROADCAST" | "NET_RAW" | "SETFCAP" | "SETGID" | "SETPCAP" | "SETUID" | "SYS_ADMIN" | "SYS_BOOT" | "SYS_CHROOT" | "SYS_MODULE" | "SYS_NICE" | "SYS_PACCT" | "SYS_PTRACE" | "SYS_RAWIO" | "SYS_RESOURCE" | "SYS_TIME" | "SYS_TTY_CONFIG" | "SYSLOG" | "WAKE_ALARM"

(string)

devices -> (list)

Any host devices to expose to the container. This parameter maps to Devices in the Create a container section of the Docker Remote API and the --device option to docker run .

Note

If you are using tasks that use the Fargate launch type, the devices parameter is not supported.

(structure)

An object representing a container instance host device.

hostPath -> (string)

The path for the device on the host container instance.

containerPath -> (string)

The path inside the container at which to expose the host device.

permissions -> (list)

The explicit permissions to provide to the container for the device. By default, the container has permissions for read , write , and mknod for the device.

(string)

initProcessEnabled -> (boolean)

Run an init process inside the container that forwards signals and reaps processes. This parameter maps to the --init option to docker run . This parameter requires version 1.25 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

sharedMemorySize -> (integer)

The value for the size (in MiB) of the /dev/shm volume. This parameter maps to the --shm-size option to docker run .

Note

If you are using tasks that use the Fargate launch type, the sharedMemorySize parameter is not supported.

tmpfs -> (list)

The container path, mount options, and size (in MiB) of the tmpfs mount. This parameter maps to the --tmpfs option to docker run .

Note

If you are using tasks that use the Fargate launch type, the tmpfs parameter is not supported.

(structure)

The container path, mount options, and size of the tmpfs mount.

containerPath -> (string)

The absolute file path where the tmpfs volume is to be mounted.

size -> (integer)

The maximum size (in MiB) of the tmpfs volume.

mountOptions -> (list)

The list of tmpfs volume mount options.

Valid values: "defaults" | "ro" | "rw" | "suid" | "nosuid" | "dev" | "nodev" | "exec" | "noexec" | "sync" | "async" | "dirsync" | "remount" | "mand" | "nomand" | "atime" | "noatime" | "diratime" | "nodiratime" | "bind" | "rbind" | "unbindable" | "runbindable" | "private" | "rprivate" | "shared" | "rshared" | "slave" | "rslave" | "relatime" | "norelatime" | "strictatime" | "nostrictatime" | "mode" | "uid" | "gid" | "nr_inodes" | "nr_blocks" | "mpol"

(string)

maxSwap -> (integer)

The total amount of swap memory (in MiB) a container can use. This parameter will be translated to the --memory-swap option to docker run where the value would be the sum of the container memory plus the maxSwap value.

If a maxSwap value of 0 is specified, the container will not use swap. Accepted values are 0 or any positive integer. If the maxSwap parameter is omitted, the container will use the swap configuration for the container instance it is running on. A maxSwap value must be set for the swappiness parameter to be used.

Note

If you are using tasks that use the Fargate launch type, the maxSwap parameter is not supported.

swappiness -> (integer)

This allows you to tune a container’s memory swappiness behavior. A swappiness value of 0 will cause swapping to not happen unless absolutely necessary. A swappiness value of 100 will cause pages to be swapped very aggressively. Accepted values are whole numbers between 0 and 100 . If the swappiness parameter is not specified, a default value of 60 is used. If a value is not specified for maxSwap then this parameter is ignored. This parameter maps to the --memory-swappiness option to docker run .

Note

If you are using tasks that use the Fargate launch type, the swappiness parameter is not supported.

secrets -> (list)

The secrets to pass to the container. For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

(structure)

An object representing the secret to expose to your container. Secrets can be exposed to a container in the following ways:

To inject sensitive data into your containers as environment variables, use the secrets container definition parameter.

To reference sensitive information in the log configuration of a container, use the secretOptions container definition parameter.

For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

name -> (string)

The name of the secret.

valueFrom -> (string)

The secret to expose to the container. The supported values are either the full ARN of the AWS Secrets Manager secret or the full ARN of the parameter in the AWS Systems Manager Parameter Store.

Note

If the AWS Systems Manager Parameter Store parameter exists in the same Region as the task you are launching, then you can use either the full ARN or name of the parameter. If the parameter exists in a different Region, then the full ARN must be specified.

dependsOn -> (list)

The dependencies defined for container startup and shutdown. A container can contain multiple dependencies. When a dependency is defined for container startup, for container shutdown it is reversed.

For tasks using the EC2 launch type, the container instances require at least version 1.26.0 of the container agent to enable container dependencies. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

For tasks using the Fargate launch type, the task or service requires platform version 1.3.0 or later.

(structure)

The dependencies defined for container startup and shutdown. A container can contain multiple dependencies. When a dependency is defined for container startup, for container shutdown it is reversed.

Your Amazon ECS container instances require at least version 1.26.0 of the container agent to enable container dependencies. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

Note

For tasks using the Fargate launch type, this parameter requires that the task or service uses platform version 1.3.0 or later.

containerName -> (string)

The name of a container.

condition -> (string)

The dependency condition of the container. The following are the available conditions and their behavior:

START - This condition emulates the behavior of links and volumes today. It validates that a dependent container is started before permitting other containers to start.

COMPLETE - This condition validates that a dependent container runs to completion (exits) before permitting other containers to start. This can be useful for nonessential containers that run a script and then exit. This condition cannot be set on an essential container.

SUCCESS - This condition is the same as COMPLETE , but it also requires that the container exits with a zero status. This condition cannot be set on an essential container.

HEALTHY - This condition validates that the dependent container passes its Docker health check before permitting other containers to start. This requires that the dependent container has health checks configured. This condition is confirmed only at task startup.

startTimeout -> (integer)

Time duration (in seconds) to wait before giving up on resolving dependencies for a container. For example, you specify two containers in a task definition with containerA having a dependency on containerB reaching a COMPLETE , SUCCESS , or HEALTHY status. If a startTimeout value is specified for containerB and it does not reach the desired status within that time then containerA will give up and not start. This results in the task transitioning to a STOPPED state.

Note

When the ECS_CONTAINER_START_TIMEOUT container agent configuration variable is used, it is enforced indendently from this start timeout value.

For tasks using the Fargate launch type, this parameter requires that the task or service uses platform version 1.3.0 or later.

For tasks using the EC2 launch type, your container instances require at least version 1.26.0 of the container agent to enable a container start timeout value. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

stopTimeout -> (integer)

Time duration (in seconds) to wait before the container is forcefully killed if it doesn’t exit normally on its own.

For tasks using the Fargate launch type, the task or service requires platform version 1.3.0 or later. The max stop timeout value is 120 seconds and if the parameter is not specified, the default value of 30 seconds is used.

For tasks using the EC2 launch type, if the stopTimeout parameter is not specified, the value set for the Amazon ECS container agent configuration variable ECS_CONTAINER_STOP_TIMEOUT is used by default. If neither the stopTimeout parameter or the ECS_CONTAINER_STOP_TIMEOUT agent configuration variable are set, then the default values of 30 seconds for Linux containers and 30 seconds on Windows containers are used. Your container instances require at least version 1.26.0 of the container agent to enable a container stop timeout value. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

hostname -> (string)

The hostname to use for your container. This parameter maps to Hostname in the Create a container section of the Docker Remote API and the --hostname option to docker run .

Note

The hostname parameter is not supported if you are using the awsvpc network mode.

user -> (string)

The user to use inside the container. This parameter maps to User in the Create a container section of the Docker Remote API and the --user option to docker run .

Warning

When running tasks using the host network mode, you should not run containers using the root user (UID 0). It is considered best practice to use a non-root user.

You can specify the user using the following formats. If specifying a UID or GID, you must specify it as a positive integer.

user

user:group

uid

uid:gid

user:gid

uid:group

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

workingDirectory -> (string)

The working directory in which to run commands inside the container. This parameter maps to WorkingDir in the Create a container section of the Docker Remote API and the --workdir option to docker run .

disableNetworking -> (boolean)

When this parameter is true, networking is disabled within the container. This parameter maps to NetworkDisabled in the Create a container section of the Docker Remote API .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

privileged -> (boolean)

When this parameter is true, the container is given elevated privileges on the host container instance (similar to the root user). This parameter maps to Privileged in the Create a container section of the Docker Remote API and the --privileged option to docker run .

Note

This parameter is not supported for Windows containers or tasks using the Fargate launch type.

readonlyRootFilesystem -> (boolean)

When this parameter is true, the container is given read-only access to its root file system. This parameter maps to ReadonlyRootfs in the Create a container section of the Docker Remote API and the --read-only option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

dnsServers -> (list)

A list of DNS servers that are presented to the container. This parameter maps to Dns in the Create a container section of the Docker Remote API and the --dns option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(string)

dnsSearchDomains -> (list)

A list of DNS search domains that are presented to the container. This parameter maps to DnsSearch in the Create a container section of the Docker Remote API and the --dns-search option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(string)

extraHosts -> (list)

A list of hostnames and IP address mappings to append to the /etc/hosts file on the container. This parameter maps to ExtraHosts in the Create a container section of the Docker Remote API and the --add-host option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(structure)

Hostnames and IP address entries that are added to the /etc/hosts file of a container via the extraHosts parameter of its ContainerDefinition .

hostname -> (string)

The hostname to use in the /etc/hosts entry.

ipAddress -> (string)

The IP address to use in the /etc/hosts entry.

dockerSecurityOptions -> (list)

A list of strings to provide custom labels for SELinux and AppArmor multi-level security systems. This field is not valid for containers in tasks using the Fargate launch type.

With Windows containers, this parameter can be used to reference a credential spec file when configuring a container for Active Directory authentication. For more information, see Using gMSAs for Windows Containers in the Amazon Elastic Container Service Developer Guide .

This parameter maps to SecurityOpt in the Create a container section of the Docker Remote API and the --security-opt option to docker run .

Note

The Amazon ECS container agent running on a container instance must register with the ECS_SELINUX_CAPABLE=true or ECS_APPARMOR_CAPABLE=true environment variables before containers placed on that instance can use these security options. For more information, see Amazon ECS Container Agent Configuration in the Amazon Elastic Container Service Developer Guide .

For more information about valid values, see Docker Run Security Configuration .

Valid values: “no-new-privileges” | “apparmor:PROFILE” | “label:value” | “credentialspec:CredentialSpecFilePath”

(string)

interactive -> (boolean)

When this parameter is true , this allows you to deploy containerized applications that require stdin or a tty to be allocated. This parameter maps to OpenStdin in the Create a container section of the Docker Remote API and the --interactive option to docker run .

pseudoTerminal -> (boolean)

When this parameter is true , a TTY is allocated. This parameter maps to Tty in the Create a container section of the Docker Remote API and the --tty option to docker run .

dockerLabels -> (map)

A key/value map of labels to add to the container. This parameter maps to Labels in the Create a container section of the Docker Remote API and the --label option to docker run . This parameter requires version 1.18 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

key -> (string)

value -> (string)

ulimits -> (list)

A list of ulimits to set in the container. If a ulimit value is specified in a task definition, it will override the default values set by Docker. This parameter maps to Ulimits in the Create a container section of the Docker Remote API and the --ulimit option to docker run . Valid naming values are displayed in the Ulimit data type. This parameter requires version 1.18 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(structure)

The ulimit settings to pass to the container.

name -> (string)

The type of the ulimit .

softLimit -> (integer)

The soft limit for the ulimit type.

hardLimit -> (integer)

The hard limit for the ulimit type.

logConfiguration -> (structure)

The log configuration specification for the container.

This parameter maps to LogConfig in the Create a container section of the Docker Remote API and the --log-driver option to docker run . By default, containers use the same logging driver that the Docker daemon uses. However the container may use a different logging driver than the Docker daemon by specifying a log driver with this parameter in the container definition. To use a different logging driver for a container, the log system must be configured properly on the container instance (or on a different log server for remote logging options). For more information on the options for different supported log drivers, see Configure logging drivers in the Docker documentation.

Note

Amazon ECS currently supports a subset of the logging drivers available to the Docker daemon (shown in the LogConfiguration data type). Additional log drivers may be available in future releases of the Amazon ECS container agent.

This parameter requires version 1.18 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

Note

The Amazon ECS container agent running on a container instance must register the logging drivers available on that instance with the ECS_AVAILABLE_LOGGING_DRIVERS environment variable before containers placed on that instance can use these log configuration options. For more information, see Amazon ECS Container Agent Configuration in the Amazon Elastic Container Service Developer Guide .

logDriver -> (string)

The log driver to use for the container.

For tasks on AWS Fargate, the supported log drivers are awslogs , splunk , and awsfirelens .

For tasks hosted on Amazon EC2 instances, the supported log drivers are awslogs , fluentd , gelf , json-file , journald , logentries ,``syslog`` , splunk , and awsfirelens .

For more information about using the awslogs log driver, see Using the awslogs log driver in the Amazon Elastic Container Service Developer Guide .

For more information about using the awsfirelens log driver, see Custom log routing in the Amazon Elastic Container Service Developer Guide .

Note

If you have a custom driver that is not listed, you can fork the Amazon ECS container agent project that is available on GitHub and customize it to work with that driver. We encourage you to submit pull requests for changes that you would like to have included. However, we do not currently provide support for running modified copies of this software.

options -> (map)

The configuration options to send to the log driver. This parameter requires version 1.19 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

key -> (string)

value -> (string)

secretOptions -> (list)

The secrets to pass to the log configuration. For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

(structure)

An object representing the secret to expose to your container. Secrets can be exposed to a container in the following ways:

To inject sensitive data into your containers as environment variables, use the secrets container definition parameter.

To reference sensitive information in the log configuration of a container, use the secretOptions container definition parameter.

For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

name -> (string)

The name of the secret.

valueFrom -> (string)

The secret to expose to the container. The supported values are either the full ARN of the AWS Secrets Manager secret or the full ARN of the parameter in the AWS Systems Manager Parameter Store.

Note

If the AWS Systems Manager Parameter Store parameter exists in the same Region as the task you are launching, then you can use either the full ARN or name of the parameter. If the parameter exists in a different Region, then the full ARN must be specified.

healthCheck -> (structure)

The container health check command and associated configuration parameters for the container. This parameter maps to HealthCheck in the Create a container section of the Docker Remote API and the HEALTHCHECK parameter of docker run .

command -> (list)

A string array representing the command that the container runs to determine if it is healthy. The string array must start with CMD to execute the command arguments directly, or CMD-SHELL to run the command with the container’s default shell. For example:

[ "CMD-SHELL", "curl -f http://localhost/ || exit 1" ]

An exit code of 0 indicates success, and non-zero exit code indicates failure. For more information, see HealthCheck in the Create a container section of the Docker Remote API .

(string)

interval -> (integer)

The time period in seconds between each health check execution. You may specify between 5 and 300 seconds. The default value is 30 seconds.

timeout -> (integer)

The time period in seconds to wait for a health check to succeed before it is considered a failure. You may specify between 2 and 60 seconds. The default value is 5.

retries -> (integer)

The number of times to retry a failed health check before the container is considered unhealthy. You may specify between 1 and 10 retries. The default value is 3.

startPeriod -> (integer)

The optional grace period within which to provide containers time to bootstrap before failed health checks count towards the maximum number of retries. You may specify between 0 and 300 seconds. The startPeriod is disabled by default.

Note

If a health check succeeds within the startPeriod , then the container is considered healthy and any subsequent failures count toward the maximum number of retries.

systemControls -> (list)

A list of namespaced kernel parameters to set in the container. This parameter maps to Sysctls in the Create a container section of the Docker Remote API and the --sysctl option to docker run .

Note

It is not recommended that you specify network-related systemControls parameters for multiple containers in a single task that also uses either the awsvpc or host network modes. For tasks that use the awsvpc network mode, the container that is started last determines which systemControls parameters take effect. For tasks that use the host network mode, it changes the container instance’s namespaced kernel parameters as well as the containers.

(structure)

A list of namespaced kernel parameters to set in the container. This parameter maps to Sysctls in the Create a container section of the Docker Remote API and the --sysctl option to docker run .

It is not recommended that you specify network-related systemControls parameters for multiple containers in a single task that also uses either the awsvpc or host network mode for the following reasons:

For tasks that use the awsvpc network mode, if you set systemControls for any container, it applies to all containers in the task. If you set different systemControls for multiple containers in a single task, the container that is started last determines which systemControls take effect.

For tasks that use the host network mode, the systemControls parameter applies to the container instance’s kernel parameter as well as that of all containers of any tasks running on that container instance.

namespace -> (string)

The namespaced kernel parameter for which to set a value .

value -> (string)

The value for the namespaced kernel parameter specified in namespace .

resourceRequirements -> (list)

The type and amount of a resource to assign to a container. The only supported resource is a GPU.

(structure)

The type and amount of a resource to assign to a container. The supported resource types are GPUs and Elastic Inference accelerators. For more information, see Working with GPUs on Amazon ECS or Working with Amazon Elastic Inference on Amazon ECS in the Amazon Elastic Container Service Developer Guide

value -> (string)

The value for the specified resource type.

If the GPU type is used, the value is the number of physical GPUs the Amazon ECS container agent will reserve for the container. The number of GPUs reserved for all containers in a task should not exceed the number of available GPUs on the container instance the task is launched on.

If the InferenceAccelerator type is used, the value should match the deviceName for an InferenceAccelerator specified in a task definition.

type -> (string)

The type of resource to assign to a container. The supported values are GPU or InferenceAccelerator .

firelensConfiguration -> (structure)

The FireLens configuration for the container. This is used to specify and configure a log router for container logs. For more information, see Custom Log Routing in the Amazon Elastic Container Service Developer Guide .

type -> (string)

The log router to use. The valid values are fluentd or fluentbit .

options -> (map)

The options to use when configuring the log router. This field is optional and can be used to specify a custom configuration file or to add additional metadata, such as the task, task definition, cluster, and container instance details to the log event. If specified, the syntax to use is "options":{"enable-ecs-log-metadata":"true|false","config-file-type:"s3|file","config-file-value":"arn:aws:s3:::mybucket/fluent.conf|filepath"} . For more information, see Creating a Task Definition that Uses a FireLens Configuration in the Amazon Elastic Container Service Developer Guide .

key -> (string)

value -> (string)

JSON Syntax:

[
  {
    "name": "string",
    "image": "string",
    "repositoryCredentials": {
      "credentialsParameter": "string"
    },
    "cpu": integer,
    "memory": integer,
    "memoryReservation": integer,
    "links": ["string", ...],
    "portMappings": [
      {
        "containerPort": integer,
        "hostPort": integer,
        "protocol": "tcp"|"udp"
      }
      ...
    ],
    "essential": true|false,
    "entryPoint": ["string", ...],
    "command": ["string", ...],
    "environment": [
      {
        "name": "string",
        "value": "string"
      }
      ...
    ],
    "environmentFiles": [
      {
        "value": "string",
        "type": "s3"
      }
      ...
    ],
    "mountPoints": [
      {
        "sourceVolume": "string",
        "containerPath": "string",
        "readOnly": true|false
      }
      ...
    ],
    "volumesFrom": [
      {
        "sourceContainer": "string",
        "readOnly": true|false
      }
      ...
    ],
    "linuxParameters": {
      "capabilities": {
        "add": ["string", ...],
        "drop": ["string", ...]
      },
      "devices": [
        {
          "hostPath": "string",
          "containerPath": "string",
          "permissions": ["read"|"write"|"mknod", ...]
        }
        ...
      ],
      "initProcessEnabled": true|false,
      "sharedMemorySize": integer,
      "tmpfs": [
        {
          "containerPath": "string",
          "size": integer,
          "mountOptions": ["string", ...]
        }
        ...
      ],
      "maxSwap": integer,
      "swappiness": integer
    },
    "secrets": [
      {
        "name": "string",
        "valueFrom": "string"
      }
      ...
    ],
    "dependsOn": [
      {
        "containerName": "string",
        "condition": "START"|"COMPLETE"|"SUCCESS"|"HEALTHY"
      }
      ...
    ],
    "startTimeout": integer,
    "stopTimeout": integer,
    "hostname": "string",
    "user": "string",
    "workingDirectory": "string",
    "disableNetworking": true|false,
    "privileged": true|false,
    "readonlyRootFilesystem": true|false,
    "dnsServers": ["string", ...],
    "dnsSearchDomains": ["string", ...],
    "extraHosts": [
      {
        "hostname": "string",
        "ipAddress": "string"
      }
      ...
    ],
    "dockerSecurityOptions": ["string", ...],
    "interactive": true|false,
    "pseudoTerminal": true|false,
    "dockerLabels": {"string": "string"
      ...},
    "ulimits": [
      {
        "name": "core"|"cpu"|"data"|"fsize"|"locks"|"memlock"|"msgqueue"|"nice"|"nofile"|"nproc"|"rss"|"rtprio"|"rttime"|"sigpending"|"stack",
        "softLimit": integer,
        "hardLimit": integer
      }
      ...
    ],
    "logConfiguration": {
      "logDriver": "json-file"|"syslog"|"journald"|"gelf"|"fluentd"|"awslogs"|"splunk"|"awsfirelens",
      "options": {"string": "string"
        ...},
      "secretOptions": [
        {
          "name": "string",
          "valueFrom": "string"
        }
        ...
      ]
    },
    "healthCheck": {
      "command": ["string", ...],
      "interval": integer,
      "timeout": integer,
      "retries": integer,
      "startPeriod": integer
    },
    "systemControls": [
      {
        "namespace": "string",
        "value": "string"
      }
      ...
    ],
    "resourceRequirements": [
      {
        "value": "string",
        "type": "GPU"|"InferenceAccelerator"
      }
      ...
    ],
    "firelensConfiguration": {
      "type": "fluentd"|"fluentbit",
      "options": {"string": "string"
        ...}
    }
  }
  ...
]

--volumes (list)

A list of volume definitions in JSON format that containers in your task may use.

(structure)

A data volume used in a task definition. For tasks that use the Amazon Elastic File System (Amazon EFS), specify an efsVolumeConfiguration . For Windows tasks that use Amazon FSx for Windows File Server file system, specify a fsxWindowsFileServerVolumeConfiguration . For tasks that use a Docker volume, specify a DockerVolumeConfiguration . For tasks that use a bind mount host volume, specify a host and optional sourcePath . For more information, see Using Data Volumes in Tasks .

name -> (string)

The name of the volume. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed. This name is referenced in the sourceVolume parameter of container definition mountPoints .

host -> (structure)

This parameter is specified when you are using bind mount host volumes. The contents of the host parameter determine whether your bind mount host volume persists on the host container instance and where it is stored. If the host parameter is empty, then the Docker daemon assigns a host path for your data volume. However, the data is not guaranteed to persist after the containers associated with it stop running.

Windows containers can mount whole directories on the same drive as $env:ProgramData . Windows containers cannot mount directories on a different drive, and mount point cannot be across drives. For example, you can mount C:\my\path:C:\my\path and D:\:D:\ , but not D:\my\path:C:\my\path or D:\:C:\my\path .

sourcePath -> (string)

When the host parameter is used, specify a sourcePath to declare the path on the host container instance that is presented to the container. If this parameter is empty, then the Docker daemon has assigned a host path for you. If the host parameter contains a sourcePath file location, then the data volume persists at the specified location on the host container instance until you delete it manually. If the sourcePath value does not exist on the host container instance, the Docker daemon creates it. If the location does exist, the contents of the source path folder are exported.

If you are using the Fargate launch type, the sourcePath parameter is not supported.

dockerVolumeConfiguration -> (structure)

This parameter is specified when you are using Docker volumes. Docker volumes are only supported when you are using the EC2 launch type. Windows containers only support the use of the local driver. To use bind mounts, specify the host parameter instead.

scope -> (string)

The scope for the Docker volume that determines its lifecycle. Docker volumes that are scoped to a task are automatically provisioned when the task starts and destroyed when the task stops. Docker volumes that are scoped as shared persist after the task stops.

autoprovision -> (boolean)

If this value is true , the Docker volume is created if it does not already exist.

Note

This field is only used if the scope is shared .

driver -> (string)

The Docker volume driver to use. The driver value must match the driver name provided by Docker because it is used for task placement. If the driver was installed using the Docker plugin CLI, use docker plugin ls to retrieve the driver name from your container instance. If the driver was installed using another method, use Docker plugin discovery to retrieve the driver name. For more information, see Docker plugin discovery . This parameter maps to Driver in the Create a volume section of the Docker Remote API and the xxdriver option to docker volume create .

driverOpts -> (map)

A map of Docker driver-specific options passed through. This parameter maps to DriverOpts in the Create a volume section of the Docker Remote API and the xxopt option to docker volume create .

key -> (string)

value -> (string)

labels -> (map)

Custom metadata to add to your Docker volume. This parameter maps to Labels in the Create a volume section of the Docker Remote API and the xxlabel option to docker volume create .

key -> (string)

value -> (string)

efsVolumeConfiguration -> (structure)

This parameter is specified when you are using an Amazon Elastic File System file system for task storage.

fileSystemId -> (string)

The Amazon EFS file system ID to use.

rootDirectory -> (string)

The directory within the Amazon EFS file system to mount as the root directory inside the host. If this parameter is omitted, the root of the Amazon EFS volume will be used. Specifying / will have the same effect as omitting this parameter.

Warning

If an EFS access point is specified in the authorizationConfig , the root directory parameter must either be omitted or set to / which will enforce the path set on the EFS access point.

transitEncryption -> (string)

Whether or not to enable encryption for Amazon EFS data in transit between the Amazon ECS host and the Amazon EFS server. Transit encryption must be enabled if Amazon EFS IAM authorization is used. If this parameter is omitted, the default value of DISABLED is used. For more information, see Encrypting Data in Transit in the Amazon Elastic File System User Guide .

transitEncryptionPort -> (integer)

The port to use when sending encrypted data between the Amazon ECS host and the Amazon EFS server. If you do not specify a transit encryption port, it will use the port selection strategy that the Amazon EFS mount helper uses. For more information, see EFS Mount Helper in the Amazon Elastic File System User Guide .

authorizationConfig -> (structure)

The authorization configuration details for the Amazon EFS file system.

accessPointId -> (string)

The Amazon EFS access point ID to use. If an access point is specified, the root directory value specified in the EFSVolumeConfiguration must either be omitted or set to / which will enforce the path set on the EFS access point. If an access point is used, transit encryption must be enabled in the EFSVolumeConfiguration . For more information, see Working with Amazon EFS Access Points in the Amazon Elastic File System User Guide .

iam -> (string)

Whether or not to use the Amazon ECS task IAM role defined in a task definition when mounting the Amazon EFS file system. If enabled, transit encryption must be enabled in the EFSVolumeConfiguration . If this parameter is omitted, the default value of DISABLED is used. For more information, see Using Amazon EFS Access Points in the Amazon Elastic Container Service Developer Guide .

fsxWindowsFileServerVolumeConfiguration -> (structure)

This parameter is specified when you are using Amazon FSx for Windows File Server file system for task storage.

fileSystemId -> (string)

The Amazon FSx for Windows File Server file system ID to use.

rootDirectory -> (string)

The directory within the Amazon FSx for Windows File Server file system to mount as the root directory inside the host.

authorizationConfig -> (structure)

The authorization configuration details for the Amazon FSx for Windows File Server file system.

credentialsParameter -> (string)

The authorization credential option to use. The authorization credential options can be provided using either the Amazon Resource Name (ARN) of an AWS Secrets Manager secret or AWS Systems Manager Parameter Store parameter. The ARNs refer to the stored credentials.

domain -> (string)

A fully qualified domain name hosted by an AWS Directory Service Managed Microsoft AD (Active Directory) or self-hosted AD on Amazon EC2.

Shorthand Syntax:

name=string,host={sourcePath=string},dockerVolumeConfiguration={scope=string,autoprovision=boolean,driver=string,driverOpts={KeyName1=string,KeyName2=string},labels={KeyName1=string,KeyName2=string}},efsVolumeConfiguration={fileSystemId=string,rootDirectory=string,transitEncryption=string,transitEncryptionPort=integer,authorizationConfig={accessPointId=string,iam=string}},fsxWindowsFileServerVolumeConfiguration={fileSystemId=string,rootDirectory=string,authorizationConfig={credentialsParameter=string,domain=string}} ...

JSON Syntax:

[
  {
    "name": "string",
    "host": {
      "sourcePath": "string"
    },
    "dockerVolumeConfiguration": {
      "scope": "task"|"shared",
      "autoprovision": true|false,
      "driver": "string",
      "driverOpts": {"string": "string"
        ...},
      "labels": {"string": "string"
        ...}
    },
    "efsVolumeConfiguration": {
      "fileSystemId": "string",
      "rootDirectory": "string",
      "transitEncryption": "ENABLED"|"DISABLED",
      "transitEncryptionPort": integer,
      "authorizationConfig": {
        "accessPointId": "string",
        "iam": "ENABLED"|"DISABLED"
      }
    },
    "fsxWindowsFileServerVolumeConfiguration": {
      "fileSystemId": "string",
      "rootDirectory": "string",
      "authorizationConfig": {
        "credentialsParameter": "string",
        "domain": "string"
      }
    }
  }
  ...
]

--placement-constraints (list)

An array of placement constraint objects to use for the task. You can specify a maximum of 10 constraints per task (this limit includes constraints in the task definition and those specified at runtime).

(structure)

An object representing a constraint on task placement in the task definition. For more information, see Task Placement Constraints in the Amazon Elastic Container Service Developer Guide .

Note

If you are using the Fargate launch type, task placement constraints are not supported.

type -> (string)

The type of constraint. The MemberOf constraint restricts selection to be from a group of valid candidates.

expression -> (string)

A cluster query language expression to apply to the constraint. For more information, see Cluster Query Language in the Amazon Elastic Container Service Developer Guide .

Shorthand Syntax:

type=string,expression=string ...

JSON Syntax:

[
  {
    "type": "memberOf",
    "expression": "string"
  }
  ...
]

--requires-compatibilities (list)

The task launch type that Amazon ECS should validate the task definition against. This ensures that the task definition parameters are compatible with the specified launch type. If no value is specified, it defaults to EC2 .

(string)

Syntax:

"string" "string" ...

Where valid values are:
  EC2
  FARGATE

--cpu (string)

The number of CPU units used by the task. It can be expressed as an integer using CPU units, for example 1024 , or as a string using vCPUs, for example 1 vCPU or 1 vcpu , in a task definition. String values are converted to an integer indicating the CPU units when the task definition is registered.

Note

Task-level CPU and memory parameters are ignored for Windows containers. We recommend specifying container-level resources for Windows containers.

If you are using the EC2 launch type, this field is optional. Supported values are between 128 CPU units (0.125 vCPUs) and 10240 CPU units (10 vCPUs).

If you are using the Fargate launch type, this field is required and you must use one of the following values, which determines your range of supported values for the memory parameter:

256 (.25 vCPU) - Available memory values: 512 (0.5 GB), 1024 (1 GB), 2048 (2 GB)

512 (.5 vCPU) - Available memory values: 1024 (1 GB), 2048 (2 GB), 3072 (3 GB), 4096 (4 GB)

1024 (1 vCPU) - Available memory values: 2048 (2 GB), 3072 (3 GB), 4096 (4 GB), 5120 (5 GB), 6144 (6 GB), 7168 (7 GB), 8192 (8 GB)

2048 (2 vCPU) - Available memory values: Between 4096 (4 GB) and 16384 (16 GB) in increments of 1024 (1 GB)

4096 (4 vCPU) - Available memory values: Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB)

--memory (string)

The amount of memory (in MiB) used by the task. It can be expressed as an integer using MiB, for example 1024 , or as a string using GB, for example 1GB or 1 GB , in a task definition. String values are converted to an integer indicating the MiB when the task definition is registered.

Note

Task-level CPU and memory parameters are ignored for Windows containers. We recommend specifying container-level resources for Windows containers.

If using the EC2 launch type, this field is optional.

If using the Fargate launch type, this field is required and you must use one of the following values, which determines your range of supported values for the cpu parameter:

512 (0.5 GB), 1024 (1 GB), 2048 (2 GB) - Available cpu values: 256 (.25 vCPU)

1024 (1 GB), 2048 (2 GB), 3072 (3 GB), 4096 (4 GB) - Available cpu values: 512 (.5 vCPU)

2048 (2 GB), 3072 (3 GB), 4096 (4 GB), 5120 (5 GB), 6144 (6 GB), 7168 (7 GB), 8192 (8 GB) - Available cpu values: 1024 (1 vCPU)

Between 4096 (4 GB) and 16384 (16 GB) in increments of 1024 (1 GB) - Available cpu values: 2048 (2 vCPU)

Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB) - Available cpu values: 4096 (4 vCPU)

--tags (list)

The metadata that you apply to the task definition to help you categorize and organize them. Each tag consists of a key and an optional value, both of which you define.

The following basic restrictions apply to tags:

Maximum number of tags per resource - 50

For each resource, each tag key must be unique, and each tag key can have only one value.

Maximum key length - 128 Unicode characters in UTF-8

Maximum value length - 256 Unicode characters in UTF-8

If your tagging schema is used across multiple services and resources, remember that other services may have restrictions on allowed characters. Generally allowed characters are: letters, numbers, and spaces representable in UTF-8, and the following characters: + - = . _ : / @.

Tag keys and values are case-sensitive.

Do not use aws: , AWS: , or any upper or lowercase combination of such as a prefix for either keys or values as it is reserved for AWS use. You cannot edit or delete tag keys or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

(structure)

The metadata that you apply to a resource to help you categorize and organize them. Each tag consists of a key and an optional value, both of which you define.

The following basic restrictions apply to tags:

Maximum number of tags per resource - 50

For each resource, each tag key must be unique, and each tag key can have only one value.

Maximum key length - 128 Unicode characters in UTF-8

Maximum value length - 256 Unicode characters in UTF-8

If your tagging schema is used across multiple services and resources, remember that other services may have restrictions on allowed characters. Generally allowed characters are: letters, numbers, and spaces representable in UTF-8, and the following characters: + - = . _ : / @.

Tag keys and values are case-sensitive.

Do not use aws: , AWS: , or any upper or lowercase combination of such as a prefix for either keys or values as it is reserved for AWS use. You cannot edit or delete tag keys or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

key -> (string)

One part of a key-value pair that make up a tag. A key is a general label that acts like a category for more specific tag values.

value -> (string)

The optional part of a key-value pair that make up a tag. A value acts as a descriptor within a tag category (key).

Shorthand Syntax:

key=string,value=string ...

JSON Syntax:

[
  {
    "key": "string",
    "value": "string"
  }
  ...
]

--pid-mode (string)

The process namespace to use for the containers in the task. The valid values are host or task . If host is specified, then all containers within the tasks that specified the host PID mode on the same container instance share the same process namespace with the host Amazon EC2 instance. If task is specified, all containers within the specified task share the same process namespace. If no value is specified, the default is a private namespace. For more information, see PID settings in the Docker run reference .

If the host PID mode is used, be aware that there is a heightened risk of undesired process namespace expose. For more information, see Docker security .

Note

This parameter is not supported for Windows containers or tasks using the Fargate launch type.

Possible values:

host

task

--ipc-mode (string)

The IPC resource namespace to use for the containers in the task. The valid values are host , task , or none . If host is specified, then all containers within the tasks that specified the host IPC mode on the same container instance share the same IPC resources with the host Amazon EC2 instance. If task is specified, all containers within the specified task share the same IPC resources. If none is specified, then IPC resources within the containers of a task are private and not shared with other containers in a task or on the container instance. If no value is specified, then the IPC resource namespace sharing depends on the Docker daemon setting on the container instance. For more information, see IPC settings in the Docker run reference .

If the host IPC mode is used, be aware that there is a heightened risk of undesired IPC namespace expose. For more information, see Docker security .

If you are setting namespaced kernel parameters using systemControls for the containers in the task, the following will apply to your IPC resource namespace. For more information, see System Controls in the Amazon Elastic Container Service Developer Guide .

For tasks that use the host IPC mode, IPC namespace related systemControls are not supported.

For tasks that use the task IPC mode, IPC namespace related systemControls will apply to all containers within a task.

Note

This parameter is not supported for Windows containers or tasks using the Fargate launch type.

Possible values:

host

task

none

--proxy-configuration (structure)

The configuration details for the App Mesh proxy.

For tasks using the EC2 launch type, the container instances require at least version 1.26.0 of the container agent and at least version 1.26.0-1 of the ecs-init package to enable a proxy configuration. If your container instances are launched from the Amazon ECS-optimized AMI version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI

type -> (string)

The proxy type. The only supported value is APPMESH .

containerName -> (string)

The name of the container that will serve as the App Mesh proxy.

properties -> (list)

The set of network configuration parameters to provide the Container Network Interface (CNI) plugin, specified as key-value pairs.

IgnoredUID - (Required) The user ID (UID) of the proxy container as defined by the user parameter in a container definition. This is used to ensure the proxy ignores its own traffic. If IgnoredGID is specified, this field can be empty.

IgnoredGID - (Required) The group ID (GID) of the proxy container as defined by the user parameter in a container definition. This is used to ensure the proxy ignores its own traffic. If IgnoredUID is specified, this field can be empty.

AppPorts - (Required) The list of ports that the application uses. Network traffic to these ports is forwarded to the ProxyIngressPort and ProxyEgressPort .

ProxyIngressPort - (Required) Specifies the port that incoming traffic to the AppPorts is directed to.

ProxyEgressPort - (Required) Specifies the port that outgoing traffic from the AppPorts is directed to.

EgressIgnoredPorts - (Required) The egress traffic going to the specified ports is ignored and not redirected to the ProxyEgressPort . It can be an empty list.

EgressIgnoredIPs - (Required) The egress traffic going to the specified IP addresses is ignored and not redirected to the ProxyEgressPort . It can be an empty list.

(structure)

A key-value pair object.

name -> (string)

The name of the key-value pair. For environment variables, this is the name of the environment variable.

value -> (string)

The value of the key-value pair. For environment variables, this is the value of the environment variable.

Shorthand Syntax:

type=string,containerName=string,properties=[{name=string,value=string},{name=string,value=string}]

JSON Syntax:

{
  "type": "APPMESH",
  "containerName": "string",
  "properties": [
    {
      "name": "string",
      "value": "string"
    }
    ...
  ]
}

--inference-accelerators (list)

The Elastic Inference accelerators to use for the containers in the task.

(structure)

Details on a Elastic Inference accelerator. For more information, see Working with Amazon Elastic Inference on Amazon ECS in the Amazon Elastic Container Service Developer Guide .

deviceName -> (string)

The Elastic Inference accelerator device name. The deviceName must also be referenced in a container definition as a ResourceRequirement .

deviceType -> (string)

The Elastic Inference accelerator type to use.

Shorthand Syntax:

deviceName=string,deviceType=string ...

JSON Syntax:

[
  {
    "deviceName": "string",
    "deviceType": "string"
  }
  ...
]

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Examples¶

Example 1: To register a task definition with a JSON file

The following register-task-definition example registers a task definition to the specified family with container definitions that are saved in JSON format at the specified file location.

aws ecs register-task-definition \
    --cli-input-json file://<path_to_json_file>/sleep360.json

sleep360.json file contents:

{
    "containerDefinitions": [
        {
            "name": "sleep",
            "image": "busybox",
            "cpu": 10,
            "command": [
                "sleep",
                "360"
            ],
            "memory": 10,
            "essential": true
        }
    ],
    "family": "sleep360"
}

Output:

{
    "taskDefinition": {
        "taskDefinitionArn": "arn:aws:ecs:us-west-2:123456789012:task-definition/sleep360:2",
        "containerDefinitions": [
            {
                "name": "sleep",
                "image": "busybox",
                "cpu": 10,
                "memory": 10,
                "portMappings": [],
                "essential": true,
                "command": [
                    "sleep",
                    "360"
                ],
                "environment": [],
                "mountPoints": [],
                "volumesFrom": []
            }
        ],
        "family": "sleep360",
        "revision": 2,
        "volumes": [],
        "status": "ACTIVE",
        "placementConstraints": [],
        "compatibilities": [
            "EC2"
        ]
    }
}

Example 2: To register a task definition with a JSON string parameter

The following register-task-definition example registers the same task definition from the previous example, but the container definitions are provided as a string parameter with the double quotes escaped.

aws ecs register-task-definition \
    --family sleep360 \
    --container-definitions "[{\"name\":\"sleep\",\"image\":\"busybox\",\"cpu\":10,\"command\":[\"sleep\",\"360\"],\"memory\":10,\"essential\":true}]"

The output is identical to the previous example.

Example 3: To use data volumes in a task definition

This example task definition file creates a data volume called webdata that exists at /ecs/webdata on the container instance. The volume is mounted read-only as /usr/share/nginx/html on the web container, and read-write as /nginx/ on the timer container.

{
    "family": "web-timer",
    "containerDefinitions": [
        {
            "name": "web",
            "image": "nginx",
            "cpu": 99,
            "memory": 100,
            "portMappings": [
                {
                    "containerPort": 80,
                    "hostPort": 80
                }
            ],
            "essential": true,
            "mountPoints": [
                {
                    "sourceVolume": "webdata",
                    "containerPath": "/usr/share/nginx/html",
                    "readOnly": true
                }
            ]
        },
        {
            "name": "timer",
            "image": "busybox",
            "cpu": 10,
            "memory": 20,
            "entryPoint": ["sh", "-c"],
            "command": ["while true; do date > /nginx/index.html; sleep 1; done"],
            "mountPoints": [
                {
                    "sourceVolume": "webdata",
                    "containerPath": "/nginx/"
                }
            ]
        }
    ],
    "volumes": [
        {
            "name": "webdata",
            "host": {
                "sourcePath": "/ecs/webdata"
            }
        }
    ]
}

For more information, see Creating a Task Definition in the Amazon ECS Developer Guide.

Output¶

taskDefinition -> (structure)

The full description of the registered task definition.

taskDefinitionArn -> (string)

The full Amazon Resource Name (ARN) of the task definition.

containerDefinitions -> (list)

A list of container definitions in JSON format that describe the different containers that make up your task. For more information about container definition parameters and defaults, see Amazon ECS Task Definitions in the Amazon Elastic Container Service Developer Guide .

(structure)

Container definitions are used in task definitions to describe the different containers that are launched as part of a task.

name -> (string)

The name of a container. If you are linking multiple containers together in a task definition, the name of one container can be entered in the links of another container to connect the containers. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed. This parameter maps to name in the Create a container section of the Docker Remote API and the --name option to docker run .

image -> (string)

The image used to start a container. This string is passed directly to the Docker daemon. Images in the Docker Hub registry are available by default. Other repositories are specified with either `` repository-url /image :tag `` or `` repository-url /image @*digest* `` . Up to 255 letters (uppercase and lowercase), numbers, hyphens, underscores, colons, periods, forward slashes, and number signs are allowed. This parameter maps to Image in the Create a container section of the Docker Remote API and the IMAGE parameter of docker run .

When a new task starts, the Amazon ECS container agent pulls the latest version of the specified image and tag for the container to use. However, subsequent updates to a repository image are not propagated to already running tasks.

Images in Amazon ECR repositories can be specified by either using the full registry/repository:tag or registry/repository@digest . For example, 012345678910.dkr.ecr.<region-name>.amazonaws.com/<repository-name>:latest or 012345678910.dkr.ecr.<region-name>.amazonaws.com/<repository-name>@sha256:94afd1f2e64d908bc90dbca0035a5b567EXAMPLE .

Images in official repositories on Docker Hub use a single name (for example, ubuntu or mongo ).

Images in other repositories on Docker Hub are qualified with an organization name (for example, amazon/amazon-ecs-agent ).

Images in other online repositories are qualified further by a domain name (for example, quay.io/assemblyline/ubuntu ).

repositoryCredentials -> (structure)

The private repository authentication credentials to use.

credentialsParameter -> (string)

The Amazon Resource Name (ARN) of the secret containing the private repository credentials.

Note

When you are using the Amazon ECS API, AWS CLI, or AWS SDK, if the secret exists in the same Region as the task that you are launching then you can use either the full ARN or the name of the secret. When you are using the AWS Management Console, you must specify the full ARN of the secret.

cpu -> (integer)

The number of cpu units reserved for the container. This parameter maps to CpuShares in the Create a container section of the Docker Remote API and the --cpu-shares option to docker run .

This field is optional for tasks using the Fargate launch type, and the only requirement is that the total amount of CPU reserved for all containers within a task be lower than the task-level cpu value.

Note

You can determine the number of CPU units that are available per EC2 instance type by multiplying the vCPUs listed for that instance type on the Amazon EC2 Instances detail page by 1,024.

Linux containers share unallocated CPU units with other containers on the container instance with the same ratio as their allocated amount. For example, if you run a single-container task on a single-core instance type with 512 CPU units specified for that container, and that is the only task running on the container instance, that container could use the full 1,024 CPU unit share at any given time. However, if you launched another copy of the same task on that container instance, each task would be guaranteed a minimum of 512 CPU units when needed, and each container could float to higher CPU usage if the other container was not using it, but if both tasks were 100% active all of the time, they would be limited to 512 CPU units.

On Linux container instances, the Docker daemon on the container instance uses the CPU value to calculate the relative CPU share ratios for running containers. For more information, see CPU share constraint in the Docker documentation. The minimum valid CPU share value that the Linux kernel allows is 2. However, the CPU parameter is not required, and you can use CPU values below 2 in your container definitions. For CPU values below 2 (including null), the behavior varies based on your Amazon ECS container agent version:

Agent versions less than or equal to 1.1.0: Null and zero CPU values are passed to Docker as 0, which Docker then converts to 1,024 CPU shares. CPU values of 1 are passed to Docker as 1, which the Linux kernel converts to two CPU shares.

Agent versions greater than or equal to 1.2.0: Null, zero, and CPU values of 1 are passed to Docker as 2.

On Windows container instances, the CPU limit is enforced as an absolute limit, or a quota. Windows containers only have access to the specified amount of CPU that is described in the task definition. A null or zero CPU value is passed to Docker as 0 , which Windows interprets as 1% of one CPU.

memory -> (integer)

The amount (in MiB) of memory to present to the container. If your container attempts to exceed the memory specified here, the container is killed. The total amount of memory reserved for all containers within a task must be lower than the task memory value, if one is specified. This parameter maps to Memory in the Create a container section of the Docker Remote API and the --memory option to docker run .

If using the Fargate launch type, this parameter is optional.

If using the EC2 launch type, you must specify either a task-level memory value or a container-level memory value. If you specify both a container-level memory and memoryReservation value, memory must be greater than memoryReservation . If you specify memoryReservation , then that value is subtracted from the available memory resources for the container instance on which the container is placed. Otherwise, the value of memory is used.

The Docker daemon reserves a minimum of 4 MiB of memory for a container, so you should not specify fewer than 4 MiB of memory for your containers.

memoryReservation -> (integer)

The soft limit (in MiB) of memory to reserve for the container. When system memory is under heavy contention, Docker attempts to keep the container memory to this soft limit. However, your container can consume more memory when it needs to, up to either the hard limit specified with the memory parameter (if applicable), or all of the available memory on the container instance, whichever comes first. This parameter maps to MemoryReservation in the Create a container section of the Docker Remote API and the --memory-reservation option to docker run .

If a task-level memory value is not specified, you must specify a non-zero integer for one or both of memory or memoryReservation in a container definition. If you specify both, memory must be greater than memoryReservation . If you specify memoryReservation , then that value is subtracted from the available memory resources for the container instance on which the container is placed. Otherwise, the value of memory is used.

For example, if your container normally uses 128 MiB of memory, but occasionally bursts to 256 MiB of memory for short periods of time, you can set a memoryReservation of 128 MiB, and a memory hard limit of 300 MiB. This configuration would allow the container to only reserve 128 MiB of memory from the remaining resources on the container instance, but also allow the container to consume more memory resources when needed.

The Docker daemon reserves a minimum of 4 MiB of memory for a container, so you should not specify fewer than 4 MiB of memory for your containers.

links -> (list)

The links parameter allows containers to communicate with each other without the need for port mappings. This parameter is only supported if the network mode of a task definition is bridge . The name:internalName construct is analogous to name:alias in Docker links. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed. For more information about linking Docker containers, go to Legacy container links in the Docker documentation. This parameter maps to Links in the Create a container section of the Docker Remote API and the --link option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

Warning

Containers that are collocated on a single container instance may be able to communicate with each other without requiring links or host port mappings. Network isolation is achieved on the container instance using security groups and VPC settings.

(string)

portMappings -> (list)

The list of port mappings for the container. Port mappings allow containers to access ports on the host container instance to send or receive traffic.

For task definitions that use the awsvpc network mode, you should only specify the containerPort . The hostPort can be left blank or it must be the same value as the containerPort .

Port mappings on Windows use the NetNAT gateway address rather than localhost . There is no loopback for port mappings on Windows, so you cannot access a container’s mapped port from the host itself.

This parameter maps to PortBindings in the Create a container section of the Docker Remote API and the --publish option to docker run . If the network mode of a task definition is set to none , then you can’t specify port mappings. If the network mode of a task definition is set to host , then host ports must either be undefined or they must match the container port in the port mapping.

Note

After a task reaches the RUNNING status, manual and automatic host and container port assignments are visible in the Network Bindings section of a container description for a selected task in the Amazon ECS console. The assignments are also visible in the networkBindings section DescribeTasks responses.

(structure)

Port mappings allow containers to access ports on the host container instance to send or receive traffic. Port mappings are specified as part of the container definition.

If you are using containers in a task with the awsvpc or host network mode, exposed ports should be specified using containerPort . The hostPort can be left blank or it must be the same value as the containerPort .

After a task reaches the RUNNING status, manual and automatic host and container port assignments are visible in the networkBindings section of DescribeTasks API responses.

containerPort -> (integer)

The port number on the container that is bound to the user-specified or automatically assigned host port.

If you are using containers in a task with the awsvpc or host network mode, exposed ports should be specified using containerPort .

If you are using containers in a task with the bridge network mode and you specify a container port and not a host port, your container automatically receives a host port in the ephemeral port range. For more information, see hostPort . Port mappings that are automatically assigned in this way do not count toward the 100 reserved ports limit of a container instance.

hostPort -> (integer)

The port number on the container instance to reserve for your container.

If you are using containers in a task with the awsvpc or host network mode, the hostPort can either be left blank or set to the same value as the containerPort .

If you are using containers in a task with the bridge network mode, you can specify a non-reserved host port for your container port mapping, or you can omit the hostPort (or set it to 0 ) while specifying a containerPort and your container automatically receives a port in the ephemeral port range for your container instance operating system and Docker version.

The default ephemeral port range for Docker version 1.6.0 and later is listed on the instance under /proc/sys/net/ipv4/ip_local_port_range . If this kernel parameter is unavailable, the default ephemeral port range from 49153 through 65535 is used. Do not attempt to specify a host port in the ephemeral port range as these are reserved for automatic assignment. In general, ports below 32768 are outside of the ephemeral port range.

Note

The default ephemeral port range from 49153 through 65535 is always used for Docker versions before 1.6.0.

The default reserved ports are 22 for SSH, the Docker ports 2375 and 2376, and the Amazon ECS container agent ports 51678-51680. Any host port that was previously specified in a running task is also reserved while the task is running (after a task stops, the host port is released). The current reserved ports are displayed in the remainingResources of DescribeContainerInstances output. A container instance can have up to 100 reserved ports at a time, including the default reserved ports. Automatically assigned ports don’t count toward the 100 reserved ports limit.

protocol -> (string)

The protocol used for the port mapping. Valid values are tcp and udp . The default is tcp .

essential -> (boolean)

If the essential parameter of a container is marked as true , and that container fails or stops for any reason, all other containers that are part of the task are stopped. If the essential parameter of a container is marked as false , then its failure does not affect the rest of the containers in a task. If this parameter is omitted, a container is assumed to be essential.

All tasks must have at least one essential container. If you have an application that is composed of multiple containers, you should group containers that are used for a common purpose into components, and separate the different components into multiple task definitions. For more information, see Application Architecture in the Amazon Elastic Container Service Developer Guide .

entryPoint -> (list)

Warning

Early versions of the Amazon ECS container agent do not properly handle entryPoint parameters. If you have problems using entryPoint , update your container agent or enter your commands and arguments as command array items instead.

The entry point that is passed to the container. This parameter maps to Entrypoint in the Create a container section of the Docker Remote API and the --entrypoint option to docker run . For more information, see https://docs.docker.com/engine/reference/builder/#entrypoint .

(string)

command -> (list)

The command that is passed to the container. This parameter maps to Cmd in the Create a container section of the Docker Remote API and the COMMAND parameter to docker run . For more information, see https://docs.docker.com/engine/reference/builder/#cmd . If there are multiple arguments, each argument should be a separated string in the array.

(string)

environment -> (list)

The environment variables to pass to a container. This parameter maps to Env in the Create a container section of the Docker Remote API and the --env option to docker run .

Warning

We do not recommend using plaintext environment variables for sensitive information, such as credential data.

(structure)

A key-value pair object.

name -> (string)

The name of the key-value pair. For environment variables, this is the name of the environment variable.

value -> (string)

The value of the key-value pair. For environment variables, this is the value of the environment variable.

environmentFiles -> (list)

A list of files containing the environment variables to pass to a container. This parameter maps to the --env-file option to docker run .

You can specify up to ten environment files. The file must have a .env file extension. Each line in an environment file should contain an environment variable in VARIABLE=VALUE format. Lines beginning with # are treated as comments and are ignored. For more information on the environment variable file syntax, see Declare default environment variables in file .

If there are environment variables specified using the environment parameter in a container definition, they take precedence over the variables contained within an environment file. If multiple environment files are specified that contain the same variable, they are processed from the top down. It is recommended to use unique variable names. For more information, see Specifying Environment Variables in the Amazon Elastic Container Service Developer Guide .

(structure)

A list of files containing the environment variables to pass to a container. You can specify up to ten environment files. The file must have a .env file extension. Each line in an environment file should contain an environment variable in VARIABLE=VALUE format. Lines beginning with # are treated as comments and are ignored. For more information on the environment variable file syntax, see Declare default environment variables in file .

If there are environment variables specified using the environment parameter in a container definition, they take precedence over the variables contained within an environment file. If multiple environment files are specified that contain the same variable, they are processed from the top down. It is recommended to use unique variable names. For more information, see Specifying Environment Variables in the Amazon Elastic Container Service Developer Guide .

This field is not valid for containers in tasks using the Fargate launch type.

value -> (string)

The Amazon Resource Name (ARN) of the Amazon S3 object containing the environment variable file.

type -> (string)

The file type to use. The only supported value is s3 .

mountPoints -> (list)

The mount points for data volumes in your container.

This parameter maps to Volumes in the Create a container section of the Docker Remote API and the --volume option to docker run .

Windows containers can mount whole directories on the same drive as $env:ProgramData . Windows containers cannot mount directories on a different drive, and mount point cannot be across drives.

(structure)

Details on a volume mount point that is used in a container definition.

sourceVolume -> (string)

The name of the volume to mount. Must be a volume name referenced in the name parameter of task definition volume .

containerPath -> (string)

The path on the container to mount the host volume at.

readOnly -> (boolean)

If this value is true , the container has read-only access to the volume. If this value is false , then the container can write to the volume. The default value is false .

volumesFrom -> (list)

Data volumes to mount from another container. This parameter maps to VolumesFrom in the Create a container section of the Docker Remote API and the --volumes-from option to docker run .

(structure)

Details on a data volume from another container in the same task definition.

sourceContainer -> (string)

The name of another container within the same task definition from which to mount volumes.

readOnly -> (boolean)

If this value is true , the container has read-only access to the volume. If this value is false , then the container can write to the volume. The default value is false .

linuxParameters -> (structure)

Linux-specific modifications that are applied to the container, such as Linux kernel capabilities. For more information see KernelCapabilities .

Note

This parameter is not supported for Windows containers.

capabilities -> (structure)

The Linux capabilities for the container that are added to or dropped from the default configuration provided by Docker.

Note

For tasks that use the Fargate launch type, capabilities is supported for all platform versions but the add parameter is only supported if using platform version 1.4.0 or later.

add -> (list)

The Linux capabilities for the container that have been added to the default configuration provided by Docker. This parameter maps to CapAdd in the Create a container section of the Docker Remote API and the --cap-add option to docker run .

Note

Tasks launched on AWS Fargate only support adding the SYS_PTRACE kernel capability.

Valid values: "ALL" | "AUDIT_CONTROL" | "AUDIT_WRITE" | "BLOCK_SUSPEND" | "CHOWN" | "DAC_OVERRIDE" | "DAC_READ_SEARCH" | "FOWNER" | "FSETID" | "IPC_LOCK" | "IPC_OWNER" | "KILL" | "LEASE" | "LINUX_IMMUTABLE" | "MAC_ADMIN" | "MAC_OVERRIDE" | "MKNOD" | "NET_ADMIN" | "NET_BIND_SERVICE" | "NET_BROADCAST" | "NET_RAW" | "SETFCAP" | "SETGID" | "SETPCAP" | "SETUID" | "SYS_ADMIN" | "SYS_BOOT" | "SYS_CHROOT" | "SYS_MODULE" | "SYS_NICE" | "SYS_PACCT" | "SYS_PTRACE" | "SYS_RAWIO" | "SYS_RESOURCE" | "SYS_TIME" | "SYS_TTY_CONFIG" | "SYSLOG" | "WAKE_ALARM"

(string)

drop -> (list)

The Linux capabilities for the container that have been removed from the default configuration provided by Docker. This parameter maps to CapDrop in the Create a container section of the Docker Remote API and the --cap-drop option to docker run .

Valid values: "ALL" | "AUDIT_CONTROL" | "AUDIT_WRITE" | "BLOCK_SUSPEND" | "CHOWN" | "DAC_OVERRIDE" | "DAC_READ_SEARCH" | "FOWNER" | "FSETID" | "IPC_LOCK" | "IPC_OWNER" | "KILL" | "LEASE" | "LINUX_IMMUTABLE" | "MAC_ADMIN" | "MAC_OVERRIDE" | "MKNOD" | "NET_ADMIN" | "NET_BIND_SERVICE" | "NET_BROADCAST" | "NET_RAW" | "SETFCAP" | "SETGID" | "SETPCAP" | "SETUID" | "SYS_ADMIN" | "SYS_BOOT" | "SYS_CHROOT" | "SYS_MODULE" | "SYS_NICE" | "SYS_PACCT" | "SYS_PTRACE" | "SYS_RAWIO" | "SYS_RESOURCE" | "SYS_TIME" | "SYS_TTY_CONFIG" | "SYSLOG" | "WAKE_ALARM"

(string)

devices -> (list)

Any host devices to expose to the container. This parameter maps to Devices in the Create a container section of the Docker Remote API and the --device option to docker run .

Note

If you are using tasks that use the Fargate launch type, the devices parameter is not supported.

(structure)

An object representing a container instance host device.

hostPath -> (string)

The path for the device on the host container instance.

containerPath -> (string)

The path inside the container at which to expose the host device.

permissions -> (list)

The explicit permissions to provide to the container for the device. By default, the container has permissions for read , write , and mknod for the device.

(string)

initProcessEnabled -> (boolean)

Run an init process inside the container that forwards signals and reaps processes. This parameter maps to the --init option to docker run . This parameter requires version 1.25 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

sharedMemorySize -> (integer)

The value for the size (in MiB) of the /dev/shm volume. This parameter maps to the --shm-size option to docker run .

Note

If you are using tasks that use the Fargate launch type, the sharedMemorySize parameter is not supported.

tmpfs -> (list)

The container path, mount options, and size (in MiB) of the tmpfs mount. This parameter maps to the --tmpfs option to docker run .

Note

If you are using tasks that use the Fargate launch type, the tmpfs parameter is not supported.

(structure)

The container path, mount options, and size of the tmpfs mount.

containerPath -> (string)

The absolute file path where the tmpfs volume is to be mounted.

size -> (integer)

The maximum size (in MiB) of the tmpfs volume.

mountOptions -> (list)

The list of tmpfs volume mount options.

Valid values: "defaults" | "ro" | "rw" | "suid" | "nosuid" | "dev" | "nodev" | "exec" | "noexec" | "sync" | "async" | "dirsync" | "remount" | "mand" | "nomand" | "atime" | "noatime" | "diratime" | "nodiratime" | "bind" | "rbind" | "unbindable" | "runbindable" | "private" | "rprivate" | "shared" | "rshared" | "slave" | "rslave" | "relatime" | "norelatime" | "strictatime" | "nostrictatime" | "mode" | "uid" | "gid" | "nr_inodes" | "nr_blocks" | "mpol"

(string)

maxSwap -> (integer)

The total amount of swap memory (in MiB) a container can use. This parameter will be translated to the --memory-swap option to docker run where the value would be the sum of the container memory plus the maxSwap value.

If a maxSwap value of 0 is specified, the container will not use swap. Accepted values are 0 or any positive integer. If the maxSwap parameter is omitted, the container will use the swap configuration for the container instance it is running on. A maxSwap value must be set for the swappiness parameter to be used.

Note

If you are using tasks that use the Fargate launch type, the maxSwap parameter is not supported.

swappiness -> (integer)

This allows you to tune a container’s memory swappiness behavior. A swappiness value of 0 will cause swapping to not happen unless absolutely necessary. A swappiness value of 100 will cause pages to be swapped very aggressively. Accepted values are whole numbers between 0 and 100 . If the swappiness parameter is not specified, a default value of 60 is used. If a value is not specified for maxSwap then this parameter is ignored. This parameter maps to the --memory-swappiness option to docker run .

Note

If you are using tasks that use the Fargate launch type, the swappiness parameter is not supported.

secrets -> (list)

The secrets to pass to the container. For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

(structure)

An object representing the secret to expose to your container. Secrets can be exposed to a container in the following ways:

To inject sensitive data into your containers as environment variables, use the secrets container definition parameter.

To reference sensitive information in the log configuration of a container, use the secretOptions container definition parameter.

For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

name -> (string)

The name of the secret.

valueFrom -> (string)

The secret to expose to the container. The supported values are either the full ARN of the AWS Secrets Manager secret or the full ARN of the parameter in the AWS Systems Manager Parameter Store.

Note

If the AWS Systems Manager Parameter Store parameter exists in the same Region as the task you are launching, then you can use either the full ARN or name of the parameter. If the parameter exists in a different Region, then the full ARN must be specified.

dependsOn -> (list)

The dependencies defined for container startup and shutdown. A container can contain multiple dependencies. When a dependency is defined for container startup, for container shutdown it is reversed.

For tasks using the EC2 launch type, the container instances require at least version 1.26.0 of the container agent to enable container dependencies. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

For tasks using the Fargate launch type, the task or service requires platform version 1.3.0 or later.

(structure)

The dependencies defined for container startup and shutdown. A container can contain multiple dependencies. When a dependency is defined for container startup, for container shutdown it is reversed.

Your Amazon ECS container instances require at least version 1.26.0 of the container agent to enable container dependencies. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

Note

For tasks using the Fargate launch type, this parameter requires that the task or service uses platform version 1.3.0 or later.

containerName -> (string)

The name of a container.

condition -> (string)

The dependency condition of the container. The following are the available conditions and their behavior:

START - This condition emulates the behavior of links and volumes today. It validates that a dependent container is started before permitting other containers to start.

COMPLETE - This condition validates that a dependent container runs to completion (exits) before permitting other containers to start. This can be useful for nonessential containers that run a script and then exit. This condition cannot be set on an essential container.

SUCCESS - This condition is the same as COMPLETE , but it also requires that the container exits with a zero status. This condition cannot be set on an essential container.

HEALTHY - This condition validates that the dependent container passes its Docker health check before permitting other containers to start. This requires that the dependent container has health checks configured. This condition is confirmed only at task startup.

startTimeout -> (integer)

Time duration (in seconds) to wait before giving up on resolving dependencies for a container. For example, you specify two containers in a task definition with containerA having a dependency on containerB reaching a COMPLETE , SUCCESS , or HEALTHY status. If a startTimeout value is specified for containerB and it does not reach the desired status within that time then containerA will give up and not start. This results in the task transitioning to a STOPPED state.

Note

When the ECS_CONTAINER_START_TIMEOUT container agent configuration variable is used, it is enforced indendently from this start timeout value.

For tasks using the Fargate launch type, this parameter requires that the task or service uses platform version 1.3.0 or later.

For tasks using the EC2 launch type, your container instances require at least version 1.26.0 of the container agent to enable a container start timeout value. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

stopTimeout -> (integer)

Time duration (in seconds) to wait before the container is forcefully killed if it doesn’t exit normally on its own.

For tasks using the Fargate launch type, the task or service requires platform version 1.3.0 or later. The max stop timeout value is 120 seconds and if the parameter is not specified, the default value of 30 seconds is used.

For tasks using the EC2 launch type, if the stopTimeout parameter is not specified, the value set for the Amazon ECS container agent configuration variable ECS_CONTAINER_STOP_TIMEOUT is used by default. If neither the stopTimeout parameter or the ECS_CONTAINER_STOP_TIMEOUT agent configuration variable are set, then the default values of 30 seconds for Linux containers and 30 seconds on Windows containers are used. Your container instances require at least version 1.26.0 of the container agent to enable a container stop timeout value. However, we recommend using the latest container agent version. For information about checking your agent version and updating to the latest version, see Updating the Amazon ECS Container Agent in the Amazon Elastic Container Service Developer Guide . If you are using an Amazon ECS-optimized Linux AMI, your instance needs at least version 1.26.0-1 of the ecs-init package. If your container instances are launched from version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

hostname -> (string)

The hostname to use for your container. This parameter maps to Hostname in the Create a container section of the Docker Remote API and the --hostname option to docker run .

Note

The hostname parameter is not supported if you are using the awsvpc network mode.

user -> (string)

The user to use inside the container. This parameter maps to User in the Create a container section of the Docker Remote API and the --user option to docker run .

Warning

When running tasks using the host network mode, you should not run containers using the root user (UID 0). It is considered best practice to use a non-root user.

You can specify the user using the following formats. If specifying a UID or GID, you must specify it as a positive integer.

user

user:group

uid

uid:gid

user:gid

uid:group

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

workingDirectory -> (string)

The working directory in which to run commands inside the container. This parameter maps to WorkingDir in the Create a container section of the Docker Remote API and the --workdir option to docker run .

disableNetworking -> (boolean)

When this parameter is true, networking is disabled within the container. This parameter maps to NetworkDisabled in the Create a container section of the Docker Remote API .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

privileged -> (boolean)

When this parameter is true, the container is given elevated privileges on the host container instance (similar to the root user). This parameter maps to Privileged in the Create a container section of the Docker Remote API and the --privileged option to docker run .

Note

This parameter is not supported for Windows containers or tasks using the Fargate launch type.

readonlyRootFilesystem -> (boolean)

When this parameter is true, the container is given read-only access to its root file system. This parameter maps to ReadonlyRootfs in the Create a container section of the Docker Remote API and the --read-only option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

dnsServers -> (list)

A list of DNS servers that are presented to the container. This parameter maps to Dns in the Create a container section of the Docker Remote API and the --dns option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(string)

dnsSearchDomains -> (list)

A list of DNS search domains that are presented to the container. This parameter maps to DnsSearch in the Create a container section of the Docker Remote API and the --dns-search option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(string)

extraHosts -> (list)

A list of hostnames and IP address mappings to append to the /etc/hosts file on the container. This parameter maps to ExtraHosts in the Create a container section of the Docker Remote API and the --add-host option to docker run .

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(structure)

Hostnames and IP address entries that are added to the /etc/hosts file of a container via the extraHosts parameter of its ContainerDefinition .

hostname -> (string)

The hostname to use in the /etc/hosts entry.

ipAddress -> (string)

The IP address to use in the /etc/hosts entry.

dockerSecurityOptions -> (list)

A list of strings to provide custom labels for SELinux and AppArmor multi-level security systems. This field is not valid for containers in tasks using the Fargate launch type.

With Windows containers, this parameter can be used to reference a credential spec file when configuring a container for Active Directory authentication. For more information, see Using gMSAs for Windows Containers in the Amazon Elastic Container Service Developer Guide .

This parameter maps to SecurityOpt in the Create a container section of the Docker Remote API and the --security-opt option to docker run .

Note

The Amazon ECS container agent running on a container instance must register with the ECS_SELINUX_CAPABLE=true or ECS_APPARMOR_CAPABLE=true environment variables before containers placed on that instance can use these security options. For more information, see Amazon ECS Container Agent Configuration in the Amazon Elastic Container Service Developer Guide .

For more information about valid values, see Docker Run Security Configuration .

Valid values: “no-new-privileges” | “apparmor:PROFILE” | “label:value” | “credentialspec:CredentialSpecFilePath”

(string)

interactive -> (boolean)

When this parameter is true , this allows you to deploy containerized applications that require stdin or a tty to be allocated. This parameter maps to OpenStdin in the Create a container section of the Docker Remote API and the --interactive option to docker run .

pseudoTerminal -> (boolean)

When this parameter is true , a TTY is allocated. This parameter maps to Tty in the Create a container section of the Docker Remote API and the --tty option to docker run .

dockerLabels -> (map)

A key/value map of labels to add to the container. This parameter maps to Labels in the Create a container section of the Docker Remote API and the --label option to docker run . This parameter requires version 1.18 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

key -> (string)

value -> (string)

ulimits -> (list)

A list of ulimits to set in the container. If a ulimit value is specified in a task definition, it will override the default values set by Docker. This parameter maps to Ulimits in the Create a container section of the Docker Remote API and the --ulimit option to docker run . Valid naming values are displayed in the Ulimit data type. This parameter requires version 1.18 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

Note

This parameter is not supported for Windows containers or tasks that use the awsvpc network mode.

(structure)

The ulimit settings to pass to the container.

name -> (string)

The type of the ulimit .

softLimit -> (integer)

The soft limit for the ulimit type.

hardLimit -> (integer)

The hard limit for the ulimit type.

logConfiguration -> (structure)

The log configuration specification for the container.

This parameter maps to LogConfig in the Create a container section of the Docker Remote API and the --log-driver option to docker run . By default, containers use the same logging driver that the Docker daemon uses. However the container may use a different logging driver than the Docker daemon by specifying a log driver with this parameter in the container definition. To use a different logging driver for a container, the log system must be configured properly on the container instance (or on a different log server for remote logging options). For more information on the options for different supported log drivers, see Configure logging drivers in the Docker documentation.

Note

Amazon ECS currently supports a subset of the logging drivers available to the Docker daemon (shown in the LogConfiguration data type). Additional log drivers may be available in future releases of the Amazon ECS container agent.

This parameter requires version 1.18 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

Note

The Amazon ECS container agent running on a container instance must register the logging drivers available on that instance with the ECS_AVAILABLE_LOGGING_DRIVERS environment variable before containers placed on that instance can use these log configuration options. For more information, see Amazon ECS Container Agent Configuration in the Amazon Elastic Container Service Developer Guide .

logDriver -> (string)

The log driver to use for the container.

For tasks on AWS Fargate, the supported log drivers are awslogs , splunk , and awsfirelens .

For tasks hosted on Amazon EC2 instances, the supported log drivers are awslogs , fluentd , gelf , json-file , journald , logentries ,``syslog`` , splunk , and awsfirelens .

For more information about using the awslogs log driver, see Using the awslogs log driver in the Amazon Elastic Container Service Developer Guide .

For more information about using the awsfirelens log driver, see Custom log routing in the Amazon Elastic Container Service Developer Guide .

Note

If you have a custom driver that is not listed, you can fork the Amazon ECS container agent project that is available on GitHub and customize it to work with that driver. We encourage you to submit pull requests for changes that you would like to have included. However, we do not currently provide support for running modified copies of this software.

options -> (map)

The configuration options to send to the log driver. This parameter requires version 1.19 of the Docker Remote API or greater on your container instance. To check the Docker Remote API version on your container instance, log in to your container instance and run the following command: sudo docker version --format '{{.Server.APIVersion}}'

key -> (string)

value -> (string)

secretOptions -> (list)

The secrets to pass to the log configuration. For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

(structure)

An object representing the secret to expose to your container. Secrets can be exposed to a container in the following ways:

To inject sensitive data into your containers as environment variables, use the secrets container definition parameter.

To reference sensitive information in the log configuration of a container, use the secretOptions container definition parameter.

For more information, see Specifying Sensitive Data in the Amazon Elastic Container Service Developer Guide .

name -> (string)

The name of the secret.

valueFrom -> (string)

The secret to expose to the container. The supported values are either the full ARN of the AWS Secrets Manager secret or the full ARN of the parameter in the AWS Systems Manager Parameter Store.

Note

If the AWS Systems Manager Parameter Store parameter exists in the same Region as the task you are launching, then you can use either the full ARN or name of the parameter. If the parameter exists in a different Region, then the full ARN must be specified.

healthCheck -> (structure)

The container health check command and associated configuration parameters for the container. This parameter maps to HealthCheck in the Create a container section of the Docker Remote API and the HEALTHCHECK parameter of docker run .

command -> (list)

A string array representing the command that the container runs to determine if it is healthy. The string array must start with CMD to execute the command arguments directly, or CMD-SHELL to run the command with the container’s default shell. For example:

[ "CMD-SHELL", "curl -f http://localhost/ || exit 1" ]

An exit code of 0 indicates success, and non-zero exit code indicates failure. For more information, see HealthCheck in the Create a container section of the Docker Remote API .

(string)

interval -> (integer)

The time period in seconds between each health check execution. You may specify between 5 and 300 seconds. The default value is 30 seconds.

timeout -> (integer)

The time period in seconds to wait for a health check to succeed before it is considered a failure. You may specify between 2 and 60 seconds. The default value is 5.

retries -> (integer)

The number of times to retry a failed health check before the container is considered unhealthy. You may specify between 1 and 10 retries. The default value is 3.

startPeriod -> (integer)

The optional grace period within which to provide containers time to bootstrap before failed health checks count towards the maximum number of retries. You may specify between 0 and 300 seconds. The startPeriod is disabled by default.

Note

If a health check succeeds within the startPeriod , then the container is considered healthy and any subsequent failures count toward the maximum number of retries.

systemControls -> (list)

A list of namespaced kernel parameters to set in the container. This parameter maps to Sysctls in the Create a container section of the Docker Remote API and the --sysctl option to docker run .

Note

It is not recommended that you specify network-related systemControls parameters for multiple containers in a single task that also uses either the awsvpc or host network modes. For tasks that use the awsvpc network mode, the container that is started last determines which systemControls parameters take effect. For tasks that use the host network mode, it changes the container instance’s namespaced kernel parameters as well as the containers.

(structure)

A list of namespaced kernel parameters to set in the container. This parameter maps to Sysctls in the Create a container section of the Docker Remote API and the --sysctl option to docker run .

It is not recommended that you specify network-related systemControls parameters for multiple containers in a single task that also uses either the awsvpc or host network mode for the following reasons:

For tasks that use the awsvpc network mode, if you set systemControls for any container, it applies to all containers in the task. If you set different systemControls for multiple containers in a single task, the container that is started last determines which systemControls take effect.

For tasks that use the host network mode, the systemControls parameter applies to the container instance’s kernel parameter as well as that of all containers of any tasks running on that container instance.

namespace -> (string)

The namespaced kernel parameter for which to set a value .

value -> (string)

The value for the namespaced kernel parameter specified in namespace .

resourceRequirements -> (list)

The type and amount of a resource to assign to a container. The only supported resource is a GPU.

(structure)

The type and amount of a resource to assign to a container. The supported resource types are GPUs and Elastic Inference accelerators. For more information, see Working with GPUs on Amazon ECS or Working with Amazon Elastic Inference on Amazon ECS in the Amazon Elastic Container Service Developer Guide

value -> (string)

The value for the specified resource type.

If the GPU type is used, the value is the number of physical GPUs the Amazon ECS container agent will reserve for the container. The number of GPUs reserved for all containers in a task should not exceed the number of available GPUs on the container instance the task is launched on.

If the InferenceAccelerator type is used, the value should match the deviceName for an InferenceAccelerator specified in a task definition.

type -> (string)

The type of resource to assign to a container. The supported values are GPU or InferenceAccelerator .

firelensConfiguration -> (structure)

The FireLens configuration for the container. This is used to specify and configure a log router for container logs. For more information, see Custom Log Routing in the Amazon Elastic Container Service Developer Guide .

type -> (string)

The log router to use. The valid values are fluentd or fluentbit .

options -> (map)

The options to use when configuring the log router. This field is optional and can be used to specify a custom configuration file or to add additional metadata, such as the task, task definition, cluster, and container instance details to the log event. If specified, the syntax to use is "options":{"enable-ecs-log-metadata":"true|false","config-file-type:"s3|file","config-file-value":"arn:aws:s3:::mybucket/fluent.conf|filepath"} . For more information, see Creating a Task Definition that Uses a FireLens Configuration in the Amazon Elastic Container Service Developer Guide .

key -> (string)

value -> (string)

family -> (string)

The name of a family that this task definition is registered to. Up to 255 letters (uppercase and lowercase), numbers, hyphens, and underscores are allowed.

A family groups multiple versions of a task definition. Amazon ECS gives the first task definition that you registered to a family a revision number of 1. Amazon ECS gives sequential revision numbers to each task definition that you add.

taskRoleArn -> (string)

The short name or full Amazon Resource Name (ARN) of the AWS Identity and Access Management (IAM) role that grants containers in the task permission to call AWS APIs on your behalf. For more information, see Amazon ECS Task Role in the Amazon Elastic Container Service Developer Guide .

IAM roles for tasks on Windows require that the -EnableTaskIAMRole option is set when you launch the Amazon ECS-optimized Windows AMI. Your containers must also run some configuration code in order to take advantage of the feature. For more information, see Windows IAM Roles for Tasks in the Amazon Elastic Container Service Developer Guide .

executionRoleArn -> (string)

The Amazon Resource Name (ARN) of the task execution role that grants the Amazon ECS container agent permission to make AWS API calls on your behalf. The task execution IAM role is required depending on the requirements of your task. For more information, see Amazon ECS task execution IAM role in the Amazon Elastic Container Service Developer Guide .

networkMode -> (string)

The Docker networking mode to use for the containers in the task. The valid values are none , bridge , awsvpc , and host . If no network mode is specified, the default is bridge .

For Amazon ECS tasks on Fargate, the awsvpc network mode is required. For Amazon ECS tasks on Amazon EC2 instances, any network mode can be used. If the network mode is set to none , you cannot specify port mappings in your container definitions, and the tasks containers do not have external connectivity. The host and awsvpc network modes offer the highest networking performance for containers because they use the EC2 network stack instead of the virtualized network stack provided by the bridge mode.

With the host and awsvpc network modes, exposed container ports are mapped directly to the corresponding host port (for the host network mode) or the attached elastic network interface port (for the awsvpc network mode), so you cannot take advantage of dynamic host port mappings.

Warning

When using the host network mode, you should not run containers using the root user (UID 0). It is considered best practice to use a non-root user.

If the network mode is awsvpc , the task is allocated an elastic network interface, and you must specify a NetworkConfiguration value when you create a service or run a task with the task definition. For more information, see Task Networking in the Amazon Elastic Container Service Developer Guide .

Note

Currently, only Amazon ECS-optimized AMIs, other Amazon Linux variants with the ecs-init package, or AWS Fargate infrastructure support the awsvpc network mode.

If the network mode is host , you cannot run multiple instantiations of the same task on a single container instance when port mappings are used.

Docker for Windows uses different network modes than Docker for Linux. When you register a task definition with Windows containers, you must not specify a network mode. If you use the console to register a task definition with Windows containers, you must choose the <default> network mode object.

For more information, see Network settings in the Docker run reference .

revision -> (integer)

The revision of the task in a particular family. The revision is a version number of a task definition in a family. When you register a task definition for the first time, the revision is 1 . Each time that you register a new revision of a task definition in the same family, the revision value always increases by one, even if you have deregistered previous revisions in this family.

volumes -> (list)

The list of volume definitions for the task.

If your tasks are using the Fargate launch type, the host and sourcePath parameters are not supported.

For more information about volume definition parameters and defaults, see Amazon ECS Task Definitions in the Amazon Elastic Container Service Developer Guide .

(structure)

A data volume used in a task definition. For tasks that use the Amazon Elastic File System (Amazon EFS), specify an efsVolumeConfiguration . For Windows tasks that use Amazon FSx for Windows File Server file system, specify a fsxWindowsFileServerVolumeConfiguration . For tasks that use a Docker volume, specify a DockerVolumeConfiguration . For tasks that use a bind mount host volume, specify a host and optional sourcePath . For more information, see Using Data Volumes in Tasks .

name -> (string)

The name of the volume. Up to 255 letters (uppercase and lowercase), numbers, and hyphens are allowed. This name is referenced in the sourceVolume parameter of container definition mountPoints .

host -> (structure)

This parameter is specified when you are using bind mount host volumes. The contents of the host parameter determine whether your bind mount host volume persists on the host container instance and where it is stored. If the host parameter is empty, then the Docker daemon assigns a host path for your data volume. However, the data is not guaranteed to persist after the containers associated with it stop running.

Windows containers can mount whole directories on the same drive as $env:ProgramData . Windows containers cannot mount directories on a different drive, and mount point cannot be across drives. For example, you can mount C:\my\path:C:\my\path and D:\:D:\ , but not D:\my\path:C:\my\path or D:\:C:\my\path .

sourcePath -> (string)

When the host parameter is used, specify a sourcePath to declare the path on the host container instance that is presented to the container. If this parameter is empty, then the Docker daemon has assigned a host path for you. If the host parameter contains a sourcePath file location, then the data volume persists at the specified location on the host container instance until you delete it manually. If the sourcePath value does not exist on the host container instance, the Docker daemon creates it. If the location does exist, the contents of the source path folder are exported.

If you are using the Fargate launch type, the sourcePath parameter is not supported.

dockerVolumeConfiguration -> (structure)

This parameter is specified when you are using Docker volumes. Docker volumes are only supported when you are using the EC2 launch type. Windows containers only support the use of the local driver. To use bind mounts, specify the host parameter instead.

scope -> (string)

The scope for the Docker volume that determines its lifecycle. Docker volumes that are scoped to a task are automatically provisioned when the task starts and destroyed when the task stops. Docker volumes that are scoped as shared persist after the task stops.

autoprovision -> (boolean)

If this value is true , the Docker volume is created if it does not already exist.

Note

This field is only used if the scope is shared .

driver -> (string)

The Docker volume driver to use. The driver value must match the driver name provided by Docker because it is used for task placement. If the driver was installed using the Docker plugin CLI, use docker plugin ls to retrieve the driver name from your container instance. If the driver was installed using another method, use Docker plugin discovery to retrieve the driver name. For more information, see Docker plugin discovery . This parameter maps to Driver in the Create a volume section of the Docker Remote API and the xxdriver option to docker volume create .

driverOpts -> (map)

A map of Docker driver-specific options passed through. This parameter maps to DriverOpts in the Create a volume section of the Docker Remote API and the xxopt option to docker volume create .

key -> (string)

value -> (string)

labels -> (map)

Custom metadata to add to your Docker volume. This parameter maps to Labels in the Create a volume section of the Docker Remote API and the xxlabel option to docker volume create .

key -> (string)

value -> (string)

efsVolumeConfiguration -> (structure)

This parameter is specified when you are using an Amazon Elastic File System file system for task storage.

fileSystemId -> (string)

The Amazon EFS file system ID to use.

rootDirectory -> (string)

The directory within the Amazon EFS file system to mount as the root directory inside the host. If this parameter is omitted, the root of the Amazon EFS volume will be used. Specifying / will have the same effect as omitting this parameter.

Warning

If an EFS access point is specified in the authorizationConfig , the root directory parameter must either be omitted or set to / which will enforce the path set on the EFS access point.

transitEncryption -> (string)

Whether or not to enable encryption for Amazon EFS data in transit between the Amazon ECS host and the Amazon EFS server. Transit encryption must be enabled if Amazon EFS IAM authorization is used. If this parameter is omitted, the default value of DISABLED is used. For more information, see Encrypting Data in Transit in the Amazon Elastic File System User Guide .

transitEncryptionPort -> (integer)

The port to use when sending encrypted data between the Amazon ECS host and the Amazon EFS server. If you do not specify a transit encryption port, it will use the port selection strategy that the Amazon EFS mount helper uses. For more information, see EFS Mount Helper in the Amazon Elastic File System User Guide .

authorizationConfig -> (structure)

The authorization configuration details for the Amazon EFS file system.

accessPointId -> (string)

The Amazon EFS access point ID to use. If an access point is specified, the root directory value specified in the EFSVolumeConfiguration must either be omitted or set to / which will enforce the path set on the EFS access point. If an access point is used, transit encryption must be enabled in the EFSVolumeConfiguration . For more information, see Working with Amazon EFS Access Points in the Amazon Elastic File System User Guide .

iam -> (string)

Whether or not to use the Amazon ECS task IAM role defined in a task definition when mounting the Amazon EFS file system. If enabled, transit encryption must be enabled in the EFSVolumeConfiguration . If this parameter is omitted, the default value of DISABLED is used. For more information, see Using Amazon EFS Access Points in the Amazon Elastic Container Service Developer Guide .

fsxWindowsFileServerVolumeConfiguration -> (structure)

This parameter is specified when you are using Amazon FSx for Windows File Server file system for task storage.

fileSystemId -> (string)

The Amazon FSx for Windows File Server file system ID to use.

rootDirectory -> (string)

The directory within the Amazon FSx for Windows File Server file system to mount as the root directory inside the host.

authorizationConfig -> (structure)

The authorization configuration details for the Amazon FSx for Windows File Server file system.

credentialsParameter -> (string)

The authorization credential option to use. The authorization credential options can be provided using either the Amazon Resource Name (ARN) of an AWS Secrets Manager secret or AWS Systems Manager Parameter Store parameter. The ARNs refer to the stored credentials.

domain -> (string)

A fully qualified domain name hosted by an AWS Directory Service Managed Microsoft AD (Active Directory) or self-hosted AD on Amazon EC2.

status -> (string)

The status of the task definition.

requiresAttributes -> (list)

The container instance attributes required by your task. This field is not valid if you are using the Fargate launch type for your task.

(structure)

An attribute is a name-value pair associated with an Amazon ECS object. Attributes enable you to extend the Amazon ECS data model by adding custom metadata to your resources. For more information, see Attributes in the Amazon Elastic Container Service Developer Guide .

name -> (string)

The name of the attribute. The name must contain between 1 and 128 characters and name may contain letters (uppercase and lowercase), numbers, hyphens, underscores, forward slashes, back slashes, or periods.

value -> (string)

The value of the attribute. The value must contain between 1 and 128 characters and may contain letters (uppercase and lowercase), numbers, hyphens, underscores, periods, at signs (@), forward slashes, back slashes, colons, or spaces. The value cannot contain any leading or trailing whitespace.

targetType -> (string)

The type of the target with which to attach the attribute. This parameter is required if you use the short form ID for a resource instead of the full ARN.

targetId -> (string)

The ID of the target. You can specify the short form ID for a resource or the full Amazon Resource Name (ARN).

placementConstraints -> (list)

An array of placement constraint objects to use for tasks. This field is not valid if you are using the Fargate launch type for your task.

(structure)

An object representing a constraint on task placement in the task definition. For more information, see Task Placement Constraints in the Amazon Elastic Container Service Developer Guide .

Note

If you are using the Fargate launch type, task placement constraints are not supported.

type -> (string)

The type of constraint. The MemberOf constraint restricts selection to be from a group of valid candidates.

expression -> (string)

A cluster query language expression to apply to the constraint. For more information, see Cluster Query Language in the Amazon Elastic Container Service Developer Guide .

compatibilities -> (list)

The launch type to use with your task. For more information, see Amazon ECS Launch Types in the Amazon Elastic Container Service Developer Guide .

(string)

requiresCompatibilities -> (list)

The launch type the task requires. If no value is specified, it will default to EC2 . Valid values include EC2 and FARGATE .

(string)

cpu -> (string)

The number of cpu units used by the task. If you are using the EC2 launch type, this field is optional and any value can be used. If you are using the Fargate launch type, this field is required and you must use one of the following values, which determines your range of valid values for the memory parameter:

256 (.25 vCPU) - Available memory values: 512 (0.5 GB), 1024 (1 GB), 2048 (2 GB)

512 (.5 vCPU) - Available memory values: 1024 (1 GB), 2048 (2 GB), 3072 (3 GB), 4096 (4 GB)

1024 (1 vCPU) - Available memory values: 2048 (2 GB), 3072 (3 GB), 4096 (4 GB), 5120 (5 GB), 6144 (6 GB), 7168 (7 GB), 8192 (8 GB)

2048 (2 vCPU) - Available memory values: Between 4096 (4 GB) and 16384 (16 GB) in increments of 1024 (1 GB)

4096 (4 vCPU) - Available memory values: Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB)

memory -> (string)

The amount (in MiB) of memory used by the task.

If using the EC2 launch type, you must specify either a task-level memory value or a container-level memory value. This field is optional and any value can be used. If a task-level memory value is specified then the container-level memory value is optional. For more information regarding container-level memory and memory reservation, see ContainerDefinition .

If using the Fargate launch type, this field is required and you must use one of the following values, which determines your range of valid values for the cpu parameter:

512 (0.5 GB), 1024 (1 GB), 2048 (2 GB) - Available cpu values: 256 (.25 vCPU)

1024 (1 GB), 2048 (2 GB), 3072 (3 GB), 4096 (4 GB) - Available cpu values: 512 (.5 vCPU)

2048 (2 GB), 3072 (3 GB), 4096 (4 GB), 5120 (5 GB), 6144 (6 GB), 7168 (7 GB), 8192 (8 GB) - Available cpu values: 1024 (1 vCPU)

Between 4096 (4 GB) and 16384 (16 GB) in increments of 1024 (1 GB) - Available cpu values: 2048 (2 vCPU)

Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB) - Available cpu values: 4096 (4 vCPU)

inferenceAccelerators -> (list)

The Elastic Inference accelerator associated with the task.

(structure)

Details on a Elastic Inference accelerator. For more information, see Working with Amazon Elastic Inference on Amazon ECS in the Amazon Elastic Container Service Developer Guide .

deviceName -> (string)

The Elastic Inference accelerator device name. The deviceName must also be referenced in a container definition as a ResourceRequirement .

deviceType -> (string)

The Elastic Inference accelerator type to use.

pidMode -> (string)

The process namespace to use for the containers in the task. The valid values are host or task . If host is specified, then all containers within the tasks that specified the host PID mode on the same container instance share the same process namespace with the host Amazon EC2 instance. If task is specified, all containers within the specified task share the same process namespace. If no value is specified, the default is a private namespace. For more information, see PID settings in the Docker run reference .

If the host PID mode is used, be aware that there is a heightened risk of undesired process namespace expose. For more information, see Docker security .

Note

This parameter is not supported for Windows containers or tasks using the Fargate launch type.

ipcMode -> (string)

The IPC resource namespace to use for the containers in the task. The valid values are host , task , or none . If host is specified, then all containers within the tasks that specified the host IPC mode on the same container instance share the same IPC resources with the host Amazon EC2 instance. If task is specified, all containers within the specified task share the same IPC resources. If none is specified, then IPC resources within the containers of a task are private and not shared with other containers in a task or on the container instance. If no value is specified, then the IPC resource namespace sharing depends on the Docker daemon setting on the container instance. For more information, see IPC settings in the Docker run reference .

If the host IPC mode is used, be aware that there is a heightened risk of undesired IPC namespace expose. For more information, see Docker security .

If you are setting namespaced kernel parameters using systemControls for the containers in the task, the following will apply to your IPC resource namespace. For more information, see System Controls in the Amazon Elastic Container Service Developer Guide .

For tasks that use the host IPC mode, IPC namespace related systemControls are not supported.

For tasks that use the task IPC mode, IPC namespace related systemControls will apply to all containers within a task.

Note

This parameter is not supported for Windows containers or tasks using the Fargate launch type.

proxyConfiguration -> (structure)

The configuration details for the App Mesh proxy.

Your Amazon ECS container instances require at least version 1.26.0 of the container agent and at least version 1.26.0-1 of the ecs-init package to enable a proxy configuration. If your container instances are launched from the Amazon ECS-optimized AMI version 20190301 or later, then they contain the required versions of the container agent and ecs-init . For more information, see Amazon ECS-optimized Linux AMI in the Amazon Elastic Container Service Developer Guide .

type -> (string)

The proxy type. The only supported value is APPMESH .

containerName -> (string)

The name of the container that will serve as the App Mesh proxy.

properties -> (list)

The set of network configuration parameters to provide the Container Network Interface (CNI) plugin, specified as key-value pairs.

IgnoredUID - (Required) The user ID (UID) of the proxy container as defined by the user parameter in a container definition. This is used to ensure the proxy ignores its own traffic. If IgnoredGID is specified, this field can be empty.

IgnoredGID - (Required) The group ID (GID) of the proxy container as defined by the user parameter in a container definition. This is used to ensure the proxy ignores its own traffic. If IgnoredUID is specified, this field can be empty.

AppPorts - (Required) The list of ports that the application uses. Network traffic to these ports is forwarded to the ProxyIngressPort and ProxyEgressPort .

ProxyIngressPort - (Required) Specifies the port that incoming traffic to the AppPorts is directed to.

ProxyEgressPort - (Required) Specifies the port that outgoing traffic from the AppPorts is directed to.

EgressIgnoredPorts - (Required) The egress traffic going to the specified ports is ignored and not redirected to the ProxyEgressPort . It can be an empty list.

EgressIgnoredIPs - (Required) The egress traffic going to the specified IP addresses is ignored and not redirected to the ProxyEgressPort . It can be an empty list.

(structure)

A key-value pair object.

name -> (string)

The name of the key-value pair. For environment variables, this is the name of the environment variable.

value -> (string)

The value of the key-value pair. For environment variables, this is the value of the environment variable.

registeredAt -> (timestamp)

The Unix timestamp for when the task definition was registered.

deregisteredAt -> (timestamp)

The Unix timestamp for when the task definition was deregistered.

registeredBy -> (string)

The principal that registered the task definition.

tags -> (list)

The list of tags associated with the task definition.

(structure)

The metadata that you apply to a resource to help you categorize and organize them. Each tag consists of a key and an optional value, both of which you define.

The following basic restrictions apply to tags:

Maximum number of tags per resource - 50

For each resource, each tag key must be unique, and each tag key can have only one value.

Maximum key length - 128 Unicode characters in UTF-8

Maximum value length - 256 Unicode characters in UTF-8

If your tagging schema is used across multiple services and resources, remember that other services may have restrictions on allowed characters. Generally allowed characters are: letters, numbers, and spaces representable in UTF-8, and the following characters: + - = . _ : / @.

Tag keys and values are case-sensitive.

Do not use aws: , AWS: , or any upper or lowercase combination of such as a prefix for either keys or values as it is reserved for AWS use. You cannot edit or delete tag keys or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

key -> (string)

One part of a key-value pair that make up a tag. A key is a general label that acts like a category for more specific tag values.

value -> (string)

The optional part of a key-value pair that make up a tag. A value acts as a descriptor within a tag category (key).

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