ListContainerInstances - Amazon Elastic Container Service


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 Elastic Container Service Developer Guide.

Request Syntax

{ "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.


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


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

Type: String

Required: No


The maximum number of container instance results that ListContainerInstances returned 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 isn't used, then ListContainerInstances returns up to 100 results and a nextToken value if applicable.

Type: Integer

Required: No


The nextToken value returned from a ListContainerInstances request indicating that more results are available to fulfill the request and further calls are needed. If maxResults was provided, it's possible the number of results to be fewer than maxResults.


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


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 don't specify this parameter, the default is to include container instances set to all states other than INACTIVE.

Type: String


Required: No

Response Syntax

{ "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.


The list of container instances with full ARN entries for each container instance associated with the specified cluster.

Type: Array of strings


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


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


These errors are usually caused by a client action. This client action might be using an action or resource on behalf of a user that doesn't have permissions to use the action or resource. Or, it might be specifying an identifier that isn't valid.

HTTP Status Code: 400


The specified cluster wasn't found. You can view your available clusters with ListClusters. Amazon ECS clusters are Region specific.

HTTP Status Code: 400


The specified parameter isn't valid. Review the available parameters for the API request.

HTTP Status Code: 400


These errors are usually caused by a server issue.

HTTP Status Code: 500


In the following example or examples, the Authorization header contents (AUTHPARAMS) must be replaced with an AWS Signature Version 4 signature. For more information, 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 create them manually. When you use the AWS Command Line Interface 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 have to sign requests yourself.


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

Sample Request

POST / HTTP/1.1 Host: 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 {"containerInstanceArns":["arn:aws:ecs:us-east-1:012345678910:container-instance/example/1eb22c8ab33149b397dc769f68cc1319","arn:aws:ecs:us-east-1:012345678910:container-instance/example/5cf7e311a2b74d3882650353cf3b2214"]}

Sample Response

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-east-1:012345678910:container-instance/example/1eb22c8ab33149b397dc769f68cc1319", "arn:aws:ecs:us-east-1:012345678910:container-instance/example/5cf7e311a2b74d3882650353cf3b2214" ] }

See Also

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