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Amazon EC2 Container Service
API Reference (API Version 2014-11-13)

ListContainerInstances

Returns a list of container instances in a specified cluster. You can filter the results of a ListContainerInstances operation with cluster query language statements inside the filter parameter. For more information, see Cluster Query Language in the Amazon EC2 Container Service Developer Guide.

Request Syntax

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{ "cluster": "string", "filter": "string", "maxResults": number, "nextToken": "string", "status": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

cluster

The short name or full Amazon Resource Name (ARN) of the cluster that hosts the container instances to list. If you do not specify a cluster, the default cluster is assumed.

Type: String

Required: No

filter

You can filter the results of a ListContainerInstances operation with cluster query language statements. For more information, see Cluster Query Language in the Amazon EC2 Container Service Developer Guide.

Type: String

Required: No

maxResults

The maximum number of container instance results returned by ListContainerInstances in paginated output. When this parameter is used, ListContainerInstances only returns maxResults results in a single page along with a nextToken response element. The remaining results of the initial request can be seen by sending another ListContainerInstances request with the returned nextToken value. This value can be between 1 and 100. If this parameter is not used, then ListContainerInstances returns up to 100 results and a nextToken value if applicable.

Type: Integer

Required: No

nextToken

The nextToken value returned from a previous paginated ListContainerInstances request where maxResults was used and the results exceeded the value of that parameter. Pagination continues from the end of the previous results that returned the nextToken value. This value is null when there are no more results to return.

Note

This token should be treated as an opaque identifier that is only used to retrieve the next items in a list and not for other programmatic purposes.

Type: String

Required: No

status

Filters the container instances by status. For example, if you specify the DRAINING status, the results include only container instances that have been set to DRAINING using UpdateContainerInstancesState. If you do not specify this parameter, the default is to include container instances set to ACTIVE and DRAINING.

Type: String

Valid Values: ACTIVE | DRAINING

Required: No

Response Syntax

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{ "containerInstanceArns": [ "string" ], "nextToken": "string" }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

containerInstanceArns

The list of container instances with full Amazon Resource Name (ARN) entries for each container instance associated with the specified cluster.

Type: Array of strings

nextToken

The nextToken value to include in a future ListContainerInstances request. When the results of a ListContainerInstances request exceed maxResults, this value can be used to retrieve the next page of results. This value is null when there are no more results to return.

Type: String

Errors

For information about the errors that are common to all actions, see Common Errors.

ClientException

These errors are usually caused by a client action, such as using an action or resource on behalf of a user that doesn't have permission to use the action or resource, or specifying an identifier that is not valid.

HTTP Status Code: 400

ClusterNotFoundException

The specified cluster could not be found. You can view your available clusters with ListClusters. Amazon ECS clusters are region-specific.

HTTP Status Code: 400

InvalidParameterException

The specified parameter is invalid. Review the available parameters for the API request.

HTTP Status Code: 400

ServerException

These errors are usually caused by a server issue.

HTTP Status Code: 500

Example

In the following example or examples, the Authorization header contents (AUTHPARAMS) must be replaced with an AWS Signature Version 4 signature. For more information about creating these signatures, see Signature Version 4 Signing Process in the AWS General Reference.

You only need to learn how to sign HTTP requests if you intend to manually create them. When you use the AWS Command Line Interface (AWS CLI) or one of the AWS SDKs to make requests to AWS, these tools automatically sign the requests for you with the access key that you specify when you configure the tools. When you use these tools, you don't need to learn how to sign requests yourself.

Example

This example request lists the container instances in the default cluster.

Sample Request

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POST / HTTP/1.1 Host: ecs.us-west-2.amazonaws.com Accept-Encoding: identity Content-Length: 2 X-Amz-Target: AmazonEC2ContainerServiceV20141113.ListContainerInstances X-Amz-Date: 20150429T175306Z Content-Type: application/x-amz-json-1.1 Authorization: AUTHPARAMS {}

Sample Response

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HTTP/1.1 200 OK Server: Server Date: Wed, 29 Apr 2015 17:53:06 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 492 Connection: keep-alive x-amzn-RequestId: 123a4b56-7c89-01d2-3ef4-example5678f { "containerInstanceArns": [ "arn:aws:ecs:us-west-2:012345678910:container-instance/14e8cce9-0b16-4af4-bfac-a85f7587aa98", "arn:aws:ecs:us-west-2:012345678910:container-instance/23bbf61b-45b4-4a4f-b90c-c86290f066d6", "arn:aws:ecs:us-west-2:012345678910:container-instance/bd0abd43-94ce-4909-9750-0dcc471ca4cb", "arn:aws:ecs:us-west-2:012345678910:container-instance/c967b2ee-68ea-415b-b220-5936b26e6a04", "arn:aws:ecs:us-west-2:012345678910:container-instance/f5ec555b-8da4-48e1-8427-0e03c3674a29" ] }

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: