Request Syntax Request Parameters Response Syntax Response Elements Errors Examples See Also

ListTasks

Returns a list of tasks. You can filter the results by cluster, task definition family, container instance, launch type, what IAM principal started the task, or by the desired status of the task.

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

Request Syntax


{
   "cluster": "string",
   "containerInstance": "string",
   "desiredStatus": "string",
   "family": "string",
   "launchType": "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 to use when filtering the ListTasks results. If you do not specify a cluster, the default cluster is assumed.

Type: String

Required: No

containerInstance

The container instance ID or full ARN of the container instance to use when filtering 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 to use when filtering the ListTasks results. Specifying a desiredStatus of STOPPED limits the results to tasks that Amazon ECS has set the desired status to STOPPED. This 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 Amazon ECS has set the desired status to RUNNING.

Note

Although you can filter results based on a desired status of PENDING, this does not return any results. Amazon 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 task definition family to use when filtering the ListTasks results. Specifying a family limits the results to tasks that belong to that family.

Type: String

Required: No

launchType

The launch type to use when filtering the ListTasks results.

Type: String

Valid Values: EC2 | FARGATE | EXTERNAL

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 ListTasks request indicating that more results are available to fulfill the request and further calls will be needed. If maxResults was provided, it is possible the number of results to be fewer than maxResults.

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 to use when filtering 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


{
   "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 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 permissions 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

Examples

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.

Example

This example request lists all of the tasks in the default cluster.

Sample Request


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


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"
  ]
}