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

ListTasks

Returns a list of tasks for a specified cluster. You can filter the results by family name, by a particular container instance, or by the desired status of the task with the family, containerInstance, and desiredStatus parameters.

Recently-stopped tasks might appear in the returned results. Currently, stopped tasks appear in the returned results for at least one hour.

Request Syntax

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{ "cluster": "string", "containerInstance": "string", "desiredStatus": "string", "family": "string", "maxResults": number, "nextToken": "string", "serviceName": "string", "startedBy": "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 tasks to list. If you do not specify a cluster, the default cluster is assumed.

Type: String

Required: No

containerInstance

The container instance ID or full Amazon Resource Name (ARN) of the container instance with which to filter the ListTasks results. Specifying a containerInstance limits the results to tasks that belong to that container instance.

Type: String

Required: No

desiredStatus

The task desired status with which to filter the ListTasks results. Specifying a desiredStatus of STOPPED limits the results to tasks that ECS has set the desired status to STOPPED, which can be useful for debugging tasks that are not starting properly or have died or finished. The default status filter is RUNNING, which shows tasks that ECS has set the desired status to RUNNING.

Note

Although you can filter results based on a desired status of PENDING, this will not return any results because ECS never sets the desired status of a task to that value (only a task's lastStatus may have a value of PENDING).

Type: String

Valid Values: RUNNING | PENDING | STOPPED

Required: No

family

The name of the family with which to filter the ListTasks results. Specifying a family limits the results to tasks that belong to that family.

Type: String

Required: No

maxResults

The maximum number of task results returned by ListTasks in paginated output. When this parameter is used, ListTasks 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 ListTasks request with the returned nextToken value. This value can be between 1 and 100. If this parameter is not used, then ListTasks returns up to 100 results and a nextToken value if applicable.

Type: Integer

Required: No

nextToken

The nextToken value returned from a previous paginated ListTasks 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

serviceName

The name of the service with which to filter the ListTasks results. Specifying a serviceName limits the results to tasks that belong to that service.

Type: String

Required: No

startedBy

The startedBy value with which to filter the task results. Specifying a startedBy value limits the results to tasks that were started with that value.

Type: String

Required: No

Response Syntax

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{ "nextToken": "string", "taskArns": [ "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.

nextToken

The nextToken value to include in a future ListTasks request. When the results of a ListTasks 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

taskArns

The list of task Amazon Resource Name (ARN) entries for the ListTasks request.

Type: array of Strings

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

ServiceNotFoundException

The specified service could not be found. You can view your available services with ListServices. Amazon ECS services are cluster-specific and region-specific.

HTTP Status Code: 400

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 all of the tasks in the default cluster.

Sample Request

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POST / HTTP/1.1 Host: ecs.us-east-1.amazonaws.com Accept-Encoding: identity Content-Length: 2 X-Amz-Target: AmazonEC2ContainerServiceV20141113.ListTasks X-Amz-Date: 20150429T192615Z 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 19:26:16 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 330 Connection: keep-alive x-amzn-RequestId: 123a4b56-7c89-01d2-3ef4-example5678f { "taskArns": [ "arn:aws:ecs:us-east-1:012345678910:task/0b69d5c0-d655-4695-98cd-5d2d526d9d5a", "arn:aws:ecs:us-east-1:012345678910:task/51a01bdf-d00e-487e-ab14-7645330b6207", "arn:aws:ecs:us-east-1:012345678910:task/b0b28bb8-2be3-4810-b52b-88df129d893c", "arn:aws:ecs:us-east-1:012345678910:task/c09f0188-7f87-4b0f-bfc3-16296622b6fe" ] }

See Also

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