describe-launch-configurations¶

Description¶

Describes one or more launch configurations.

Synopsis¶

  describe-launch-configurations
[--launch-configuration-names <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]

Options¶

--launch-configuration-names (list)

The launch configuration names. If you omit this parameter, all launch configurations are described.

(string)

Syntax:

"string" "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.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--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¶

To describe Auto Scaling launch configurations

This example describes the specified launch configuration:

aws autoscaling describe-launch-configurations --launch-configuration-names my-launch-config

The following is example output:

{
    "LaunchConfigurations": [
        {
            "UserData": null,
            "EbsOptimized": false,
            "LaunchConfigurationARN": "arn:aws:autoscaling:us-west-2:123456789012:launchConfiguration:98d3b196-4cf9-4e88-8ca1-8547c24ced8b:launchConfigurationName/my-launch-config",
            "InstanceMonitoring": {
                "Enabled": true
            },
            "ImageId": "ami-043a5034",
            "CreatedTime": "2014-05-07T17:39:28.599Z",
            "BlockDeviceMappings": [],
            "KeyName": null,
            "SecurityGroups": [
                "sg-67ef0308"
            ],
            "LaunchConfigurationName": "my-launch-config",
            "KernelId": null,
            "RamdiskId": null,
            "InstanceType": "t1.micro",
            "AssociatePublicIpAddress": true
        }
    ]
}

To return a specific number of launch configurations, use the max-items parameter:

aws autoscaling describe-launch-configurations --max-items 1

The following is example output:

{
    "NextToken": "Z3M3LMPEXAMPLE",
    "LaunchConfigurations": [
        {
            "UserData": null,
            "EbsOptimized": false,
            "LaunchConfigurationARN": "arn:aws:autoscaling:us-west-2:123456789012:launchConfiguration:98d3b196-4cf9-4e88-8ca1-8547c24ced8b:launchConfigurationName/my-launch-config",
            "InstanceMonitoring": {
                "Enabled": true
            },
            "ImageId": "ami-043a5034",
            "CreatedTime": "2014-05-07T17:39:28.599Z",
            "BlockDeviceMappings": [],
            "KeyName": null,
            "SecurityGroups": [
                "sg-67ef0308"
            ],
            "LaunchConfigurationName": "my-launch-config",
            "KernelId": null,
            "RamdiskId": null,
            "InstanceType": "t1.micro",
            "AssociatePublicIpAddress": true
        }
    ]
}

If the output includes a NextToken field, there are more launch configurations. To get the additional launch configurations, use the value of this field with the starting-token parameter in a subsequent call as follows:

aws autoscaling describe-launch-configurations --starting-token Z3M3LMPEXAMPLE

Output¶

LaunchConfigurations -> (list)

The launch configurations.

(structure)

Describes a launch configuration.

LaunchConfigurationName -> (string)

The name of the launch configuration.

LaunchConfigurationARN -> (string)

The Amazon Resource Name (ARN) of the launch configuration.

ImageId -> (string)

The ID of the Amazon Machine Image (AMI) to use to launch your EC2 instances. For more information, see Finding an AMI in the Amazon EC2 User Guide for Linux Instances .

KeyName -> (string)

The name of the key pair.

For more information, see Amazon EC2 Key Pairs in the Amazon EC2 User Guide for Linux Instances .

SecurityGroups -> (list)

A list that contains the security groups to assign to the instances in the Auto Scaling group. For more information, see Security Groups for Your VPC in the Amazon Virtual Private Cloud User Guide .

(string)

ClassicLinkVPCId -> (string)

The ID of a ClassicLink-enabled VPC to link your EC2-Classic instances to. For more information, see ClassicLink in the Amazon EC2 User Guide for Linux Instances and Linking EC2-Classic instances to a VPC in the Amazon EC2 Auto Scaling User Guide .

ClassicLinkVPCSecurityGroups -> (list)

The IDs of one or more security groups for the VPC specified in ClassicLinkVPCId .

For more information, see ClassicLink in the Amazon EC2 User Guide for Linux Instances and Linking EC2-Classic instances to a VPC in the Amazon EC2 Auto Scaling User Guide .

(string)

UserData -> (string)

The user data to make available to the launched EC2 instances. For more information, see Instance metadata and user data (Linux) and Instance metadata and user data (Windows). If you are using a command line tool, base64-encoding is performed for you, and you can load the text from a file. Otherwise, you must provide base64-encoded text. User data is limited to 16 KB.

InstanceType -> (string)

The instance type for the instances.

For information about available instance types, see Available Instance Types in the Amazon EC2 User Guide for Linux Instances .

KernelId -> (string)

The ID of the kernel associated with the AMI.

RamdiskId -> (string)

The ID of the RAM disk associated with the AMI.

BlockDeviceMappings -> (list)

A block device mapping, which specifies the block devices for the instance. For more information, see Block Device Mapping in the Amazon EC2 User Guide for Linux Instances .

(structure)

Describes a block device mapping.

VirtualName -> (string)

The name of the virtual device (for example, ephemeral0 ).

You can specify either VirtualName or Ebs , but not both.

DeviceName -> (string)

The device name exposed to the EC2 instance (for example, /dev/sdh or xvdh ). For more information, see Device Naming on Linux Instances in the Amazon EC2 User Guide for Linux Instances .

Ebs -> (structure)

Parameters used to automatically set up EBS volumes when an instance is launched.

You can specify either VirtualName or Ebs , but not both.

SnapshotId -> (string)

The snapshot ID of the volume to use.

You must specify either a VolumeSize or a SnapshotId .

VolumeSize -> (integer)

The volume size, in Gibibytes (GiB).

This can be a number from 1-1,024 for standard , 4-16,384 for io1 , 1-16,384 for gp2 , and 500-16,384 for st1 and sc1 . If you specify a snapshot, the volume size must be equal to or larger than the snapshot size.

Default: If you create a volume from a snapshot and you don’t specify a volume size, the default is the snapshot size.

You must specify either a VolumeSize or a SnapshotId . If you specify both SnapshotId and VolumeSize , the volume size must be equal or greater than the size of the snapshot.

VolumeType -> (string)

The volume type, which can be standard for Magnetic, io1 for Provisioned IOPS SSD, gp2 for General Purpose SSD, st1 for Throughput Optimized HDD, or sc1 for Cold HDD. For more information, see Amazon EBS Volume Types in the Amazon EC2 User Guide for Linux Instances .

Valid Values: standard | io1 | gp2 | st1 | sc1

DeleteOnTermination -> (boolean)

Indicates whether the volume is deleted on instance termination. For Amazon EC2 Auto Scaling, the default value is true .

Iops -> (integer)

The number of I/O operations per second (IOPS) to provision for the volume. The maximum ratio of IOPS to volume size (in GiB) is 50:1. For more information, see Amazon EBS Volume Types in the Amazon EC2 User Guide for Linux Instances .

Required when the volume type is io1 . (Not used with standard , gp2 , st1 , or sc1 volumes.)

Encrypted -> (boolean)

Specifies whether the volume should be encrypted. Encrypted EBS volumes can only be attached to instances that support Amazon EBS encryption. For more information, see Supported Instance Types . If your AMI uses encrypted volumes, you can also only launch it on supported instance types.

Note

If you are creating a volume from a snapshot, you cannot specify an encryption value. Volumes that are created from encrypted snapshots are automatically encrypted, and volumes that are created from unencrypted snapshots are automatically unencrypted. By default, encrypted snapshots use the AWS managed CMK that is used for EBS encryption, but you can specify a custom CMK when you create the snapshot. The ability to encrypt a snapshot during copying also allows you to apply a new CMK to an already-encrypted snapshot. Volumes restored from the resulting copy are only accessible using the new CMK.

Enabling encryption by default results in all EBS volumes being encrypted with the AWS managed CMK or a customer managed CMK, whether or not the snapshot was encrypted.

For more information, see Using Encryption with EBS-Backed AMIs in the Amazon EC2 User Guide for Linux Instances and Required CMK key policy for use with encrypted volumes in the Amazon EC2 Auto Scaling User Guide .

NoDevice -> (boolean)

Setting this value to true suppresses the specified device included in the block device mapping of the AMI.

If NoDevice is true for the root device, instances might fail the EC2 health check. In that case, Amazon EC2 Auto Scaling launches replacement instances.

If you specify NoDevice , you cannot specify Ebs .

InstanceMonitoring -> (structure)

Controls whether instances in this group are launched with detailed (true ) or basic (false ) monitoring.

For more information, see Configure Monitoring for Auto Scaling Instances in the Amazon EC2 Auto Scaling User Guide .

Enabled -> (boolean)

If true , detailed monitoring is enabled. Otherwise, basic monitoring is enabled.

SpotPrice -> (string)

The maximum hourly price to be paid for any Spot Instance launched to fulfill the request. Spot Instances are launched when the price you specify exceeds the current Spot price. For more information, see Requesting Spot Instances in the Amazon EC2 Auto Scaling User Guide .

IamInstanceProfile -> (string)

The name or the Amazon Resource Name (ARN) of the instance profile associated with the IAM role for the instance. The instance profile contains the IAM role. For more information, see IAM role for applications that run on Amazon EC2 instances in the Amazon EC2 Auto Scaling User Guide .

CreatedTime -> (timestamp)

The creation date and time for the launch configuration.

EbsOptimized -> (boolean)

Specifies whether the launch configuration is optimized for EBS I/O (true ) or not (false ). For more information, see Amazon EBS-Optimized Instances in the Amazon EC2 User Guide for Linux Instances .

AssociatePublicIpAddress -> (boolean)

For Auto Scaling groups that are running in a VPC, specifies whether to assign a public IP address to the group’s instances. For more information, see Launching Auto Scaling instances in a VPC in the Amazon EC2 Auto Scaling User Guide .

PlacementTenancy -> (string)

The tenancy of the instance, either default or dedicated . An instance with dedicated tenancy runs on isolated, single-tenant hardware and can only be launched into a VPC.

For more information, see Configuring instance tenancy with Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .

MetadataOptions -> (structure)

The metadata options for the instances. For more information, see Configuring the Instance Metadata Options in the Amazon EC2 Auto Scaling User Guide .

HttpTokens -> (string)

The state of token usage for your instance metadata requests. If the parameter is not specified in the request, the default state is optional .

If the state is optional , you can choose to retrieve instance metadata with or without a signed token header on your request. If you retrieve the IAM role credentials without a token, the version 1.0 role credentials are returned. If you retrieve the IAM role credentials using a valid signed token, the version 2.0 role credentials are returned.

If the state is required , you must send a signed token header with any instance metadata retrieval requests. In this state, retrieving the IAM role credentials always returns the version 2.0 credentials; the version 1.0 credentials are not available.

HttpPutResponseHopLimit -> (integer)

The desired HTTP PUT response hop limit for instance metadata requests. The larger the number, the further instance metadata requests can travel.

Default: 1

HttpEndpoint -> (string)

This parameter enables or disables the HTTP metadata endpoint on your instances. If the parameter is not specified, the default state is enabled .

Note

If you specify a value of disabled , you will not be able to access your instance metadata.

NextToken -> (string)

A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.

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