[ aws . gamelift ]



Retrieves the current capacity statistics for one or more fleets. These statistics present a snapshot of the fleet’s instances and provide insight on current or imminent scaling activity. To get statistics on game hosting activity in the fleet, see DescribeFleetUtilization .

You can request capacity for all fleets or specify a list of one or more fleet identifiers. When requesting multiple fleets, use the pagination parameters to retrieve results as a set of sequential pages. If successful, a FleetCapacity object is returned for each requested fleet ID. When a list of fleet IDs is provided, attribute objects are returned only for fleets that currently exist.


Some API operations may limit the number of fleet IDs allowed in one request. If a request exceeds this limit, the request fails and the error message includes the maximum allowed.

Learn more

Setting up GameLift Fleets

GameLift Metrics for Fleets

Related operations

  • CreateFleet

  • ListFleets

  • DeleteFleet

  • Describe fleets:

    • DescribeFleetAttributes

    • DescribeFleetCapacity

    • DescribeFleetPortSettings

    • DescribeFleetUtilization

    • DescribeRuntimeConfiguration

    • DescribeEC2InstanceLimits

    • DescribeFleetEvents

  • UpdateFleetAttributes

  • StartFleetActions or StopFleetActions

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

describe-fleet-capacity is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: FleetCapacity


[--fleet-ids <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]


--fleet-ids (list)

A unique identifier for a fleet(s) to retrieve capacity information for. You can use either the fleet ID or ARN value.



"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.

--cli-auto-prompt (boolean) Automatically prompt for CLI input parameters.

See ‘aws help’ for descriptions of global parameters.


To view capacity status for a list of fleets

The following describe-fleet-capacity example retrieves current capacity for two specified fleets.

aws gamelift describe-fleet-capacity \
    --fleet-ids arn:aws:gamelift:us-west-2::fleet/fleet-a1b2c3d4-5678-90ab-cdef-EXAMPLE11111 fleet-a1b2c3d4-5678-90ab-cdef-EXAMPLE22222


    "FleetCapacity": [
            "FleetId": "fleet-a1b2c3d4-5678-90ab-cdef-EXAMPLE11111",
            "InstanceType": "c5.large",
            "InstanceCounts": {
                "DESIRED": 10,
                "MINIMUM": 1,
                "MAXIMUM": 20,
                "PENDING": 0,
                "ACTIVE": 10,
                "IDLE": 3,
                "TERMINATING": 0
            "FleetId": "fleet-a1b2c3d4-5678-90ab-cdef-EXAMPLE22222",
            "InstanceType": "c5.large",
            "InstanceCounts": {
                "DESIRED": 13,
                "MINIMUM": 1,
                "MAXIMUM": 20,
                "PENDING": 0,
                "ACTIVE": 15,
                "IDLE": 2,
                "TERMINATING": 2


For more information, see GameLift Metrics for Fleets in the Amazon GameLift Developer Guide.


FleetCapacity -> (list)

A collection of objects containing capacity information for each requested fleet ID. Leave this parameter empty to retrieve capacity information for all fleets.


Information about the fleet’s capacity. Fleet capacity is measured in EC2 instances. By default, new fleets have a capacity of one instance, but can be updated as needed. The maximum number of instances for a fleet is determined by the fleet’s instance type.

  • CreateFleet

  • ListFleets

  • DeleteFleet

  • DescribeFleetAttributes

  • UpdateFleetAttributes

  • StartFleetActions or StopFleetActions

FleetId -> (string)

A unique identifier for a fleet.

InstanceType -> (string)

Name of an EC2 instance type that is supported in Amazon GameLift. A fleet instance type determines the computing resources of each instance in the fleet, including CPU, memory, storage, and networking capacity. Amazon GameLift supports the following EC2 instance types. See Amazon EC2 Instance Types for detailed descriptions.

InstanceCounts -> (structure)

Current status of fleet capacity.

DESIRED -> (integer)

Ideal number of active instances in the fleet.

MINIMUM -> (integer)

The minimum value allowed for the fleet’s instance count.

MAXIMUM -> (integer)

The maximum value allowed for the fleet’s instance count.

PENDING -> (integer)

Number of instances in the fleet that are starting but not yet active.

ACTIVE -> (integer)

Actual number of active instances in the fleet.

IDLE -> (integer)

Number of active instances in the fleet that are not currently hosting a game session.

TERMINATING -> (integer)

Number of instances in the fleet that are no longer active but haven’t yet been terminated.

NextToken -> (string)

Token that indicates where to resume retrieving results on the next call to this operation. If no token is returned, these results represent the end of the list.