UpdateContainerAgent - Amazon Elastic Container Service


Updates the Amazon ECS container agent on a specified container instance. Updating the Amazon ECS container agent doesn't interrupt running tasks or services on the container instance. The process for updating the agent differs depending on whether your container instance was launched with the Amazon ECS-optimized AMI or another operating system.


The UpdateContainerAgent API isn't supported for container instances using the Amazon ECS-optimized Amazon Linux 2 (arm64) AMI. To update the container agent, you can update the ecs-init package. This updates the agent. For more information, see Updating the Amazon ECS container agent in the Amazon Elastic Container Service Developer Guide.


Agent updates with the UpdateContainerAgent API operation do not apply to Windows container instances. We recommend that you launch new container instances to update the agent version in your Windows clusters.

The UpdateContainerAgent API requires an Amazon ECS-optimized AMI or Amazon Linux AMI with the ecs-init service installed and running. For help updating the Amazon ECS container agent on other operating systems, see Manually updating the Amazon ECS container agent in the Amazon Elastic Container Service Developer Guide.

Request Syntax

{ "cluster": "string", "containerInstance": "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 your container instance is running on. If you do not specify a cluster, the default cluster is assumed.

Type: String

Required: No


The container instance ID or full ARN entries for the container instance where you would like to update the Amazon ECS container agent.

Type: String

Required: Yes

Response Syntax

{ "containerInstance": { "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" } ], "capacityProviderName": "string", "containerInstanceArn": "string", "ec2InstanceId": "string", "healthStatus": { "details": [ { "lastStatusChange": number, "lastUpdated": number, "status": "string", "type": "string" } ], "overallStatus": "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", "statusReason": "string", "tags": [ { "key": "string", "value": "string" } ], "version": number, "versionInfo": { "agentHash": "string", "agentVersion": "string", "dockerVersion": "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 container instance that the container agent was updated for.

Type: ContainerInstance object


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


Amazon ECS can't determine the current version of the Amazon ECS container agent on the container instance and doesn't have enough information to proceed with an update. This could be because the agent running on the container instance is a previous or custom version that doesn't use our version information.

HTTP Status Code: 400


There's no update available for this Amazon ECS container agent. This might be because the agent is already running the latest version or because it's so old that there's no update path to the current version.

HTTP Status Code: 400


These errors are usually caused by a server issue.

HTTP Status Code: 500


There's already a current Amazon ECS container agent update in progress on the container instance that's specified. If the container agent becomes disconnected while it's in a transitional stage, such as PENDING or STAGING, the update process can get stuck in that state. However, when the agent reconnects, it resumes where it stopped previously.

HTTP Status Code: 400


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 updates the container agent version for the container instance with the ID 53ac7152-dcd1-4102-81f5-208962864132 in the update cluster.

Sample Request

POST / HTTP/1.1 Host: ecs.us-west-2.amazonaws.com Accept-Encoding: identity Content-Length: 82 X-Amz-Target: AmazonEC2ContainerServiceV20141113.UpdateContainerAgent X-Amz-Date: 20150528T152756Z User-Agent: aws-cli/1.7.30 Python/2.7.9 Darwin/14.3.0 Content-Type: application/x-amz-json-1.1 Authorization: AUTHPARAMS { "cluster": "update", "containerInstance": "53ac7152-dcd1-4102-81f5-208962864132" }

Sample Response

HTTP/1.1 200 OK Server: Server Date: Thu, 28 May 2015 15:27:54 GMT Content-Type: application/x-amz-json-1.1 Content-Length: 1033 Connection: keep-alive x-amzn-RequestId: 123a4b56-7c89-01d2-3ef4-example5678f { "containerInstance": { "agentConnected": true, "agentUpdateStatus": "PENDING", ... "versionInfo": { "agentHash": "4023248", "agentVersion": "1.0.0", "dockerVersion": "DockerVersion: 1.5.0" } } }

See Also

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