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


Describes Amazon Elastic Container Service container instances. Returns metadata about registered and remaining resources on each container instance requested.

Request Syntax

{ "cluster": "string", "containerInstances": [ "string" ], "include": [ "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 describe. If you do not specify a cluster, the default cluster is assumed.

Type: String

Required: No


A list of up to 100 container instance IDs or full Amazon Resource Name (ARN) entries.

Type: Array of strings

Required: Yes


Specifies whether you want to see the resource tags for the container instance. If TAGS is specified, the tags are included in the response. If this field is omitted, tags are not included in the response.

Type: Array of strings

Valid Values: TAGS

Required: No

Response Syntax

{ "containerInstances": [ { "agentConnected": boolean, "agentUpdateStatus": "string", "attachments": [ { "details": [ { "name": "string", "value": "string" } ], "id": "string", "status": "string", "type": "string" } ], "attributes": [ { "name": "string", "targetId": "string", "targetType": "string", "value": "string" } ], "containerInstanceArn": "string", "ec2InstanceId": "string", "pendingTasksCount": number, "registeredAt": number, "registeredResources": [ { "doubleValue": number, "integerValue": number, "longValue": number, "name": "string", "stringSetValue": [ "string" ], "type": "string" } ], "remainingResources": [ { "doubleValue": number, "integerValue": number, "longValue": number, "name": "string", "stringSetValue": [ "string" ], "type": "string" } ], "runningTasksCount": number, "status": "string", "tags": [ { "key": "string", "value": "string" } ], "version": number, "versionInfo": { "agentHash": "string", "agentVersion": "string", "dockerVersion": "string" } } ], "failures": [ { "arn": "string", "reason": "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.

Type: Array of ContainerInstance objects


Any failures associated with the call.

Type: Array of Failure objects


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


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 permissions to use the action or resource, or specifying an identifier that is not valid.

HTTP Status Code: 400


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


The specified parameter is invalid. 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 (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 have to sign requests yourself.


This example request provides descriptive information about a container instance with an ID of f9cc75bb-0c94-46b9-bf6d-49d320bc1551 in the default cluster.

Sample Request

POST / HTTP/1.1 Host: Accept-Encoding: identity Content-Length: 64 X-Amz-Target: AmazonEC2ContainerServiceV20141113.DescribeContainerInstances X-Amz-Date: 20160520T171518Z User-Agent: aws-cli/1.10.30 Python/2.7.11 Darwin/15.4.0 botocore/1.4.17 Content-Type: application/x-amz-json-1.1 Authorization: AUTHPARAMS { "containerInstances": [ "f9cc75bb-0c94-46b9-bf6d-49d320bc1551" ] }

Sample Response

{ "containerInstances": [ { "agentConnected": true, "attributes": [ { "name": "com.amazonaws.ecs.capability.privileged-container" }, { "name": "com.amazonaws.ecs.capability.docker-remote-api.1.17" }, { "name": "com.amazonaws.ecs.capability.docker-remote-api.1.18" }, { "name": "com.amazonaws.ecs.capability.docker-remote-api.1.19" }, { "name": "com.amazonaws.ecs.capability.docker-remote-api.1.20" }, { "name": "com.amazonaws.ecs.capability.docker-remote-api.1.21" }, { "name": "com.amazonaws.ecs.capability.logging-driver.json-file" }, { "name": "com.amazonaws.ecs.capability.logging-driver.syslog" }, { "name": "com.amazonaws.ecs.capability.logging-driver.awslogs" }, { "name": "com.amazonaws.ecs.capability.ecr-auth" } ], "containerInstanceArn": "arn:aws:ecs:us-west-2:012345678910:container-instance/f9cc75bb-0c94-46b9-bf6d-49d320bc1551", "ec2InstanceId": "i-042f39dc", "pendingTasksCount": 0, "registeredResources": [ { "doubleValue": 0, "integerValue": 1024, "longValue": 0, "name": "CPU", "type": "INTEGER" }, { "doubleValue": 0, "integerValue": 995, "longValue": 0, "name": "MEMORY", "type": "INTEGER" }, { "doubleValue": 0, "integerValue": 0, "longValue": 0, "name": "PORTS", "stringSetValue": [ "22", "2376", "2375", "51678" ], "type": "STRINGSET" }, { "doubleValue": 0, "integerValue": 0, "longValue": 0, "name": "PORTS_UDP", "stringSetValue": [], "type": "STRINGSET" } ], "remainingResources": [ { "doubleValue": 0, "integerValue": 1024, "longValue": 0, "name": "CPU", "type": "INTEGER" }, { "doubleValue": 0, "integerValue": 995, "longValue": 0, "name": "MEMORY", "type": "INTEGER" }, { "doubleValue": 0, "integerValue": 0, "longValue": 0, "name": "PORTS", "stringSetValue": [ "22", "2376", "2375", "51678" ], "type": "STRINGSET" }, { "doubleValue": 0, "integerValue": 0, "longValue": 0, "name": "PORTS_UDP", "stringSetValue": [], "type": "STRINGSET" } ], "runningTasksCount": 0, "status": "ACTIVE", "version": 850, "versionInfo": { "agentHash": "0931217", "agentVersion": "1.9.0", "dockerVersion": "DockerVersion: 1.9.1" } } ], "failures": [] }

See Also

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