AWS SDK Version 3 for .NET
API Reference

AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region.

Modifies the desired count, deployment configuration, network configuration, or task definition used in a service.

You can add to or subtract from the number of instantiations of a task definition in a service by specifying the cluster that the service is running in and a new desiredCount parameter.

If you have updated the Docker image of your application, you can create a new task definition with that image and deploy it to your service. The service scheduler uses the minimum healthy percent and maximum percent parameters (in the service's deployment configuration) to determine the deployment strategy.

If your updated Docker image uses the same tag as what is in the existing task definition for your service (for example, my_image:latest), you do not need to create a new revision of your task definition. You can update the service using the forceNewDeployment option. The new tasks launched by the deployment pull the current image/tag combination from your repository when they start.

You can also update the deployment configuration of a service. When a deployment is triggered by updating the task definition of a service, the service scheduler uses the deployment configuration parameters, minimumHealthyPercent and maximumPercent, to determine the deployment strategy.

When UpdateService stops a task during a deployment, the equivalent of

is issued to the containers running in the task. This results in a SIGTERM and a 30-second timeout, after which SIGKILL is sent and the containers are forcibly stopped. If the container handles the SIGTERM gracefully and exits within 30 seconds from receiving it, no SIGKILL is sent.

When the service scheduler launches new tasks, it determines task placement in your cluster with the following logic:

When the service scheduler stops running tasks, it attempts to maintain balance across the Availability Zones in your cluster using the following logic:


For .NET Core and PCL this operation is only available in asynchronous form. Please refer to UpdateServiceAsync.

Namespace: Amazon.ECS
Assembly: AWSSDK.ECS.dll
Version: 3.x.y.z


public abstract UpdateServiceResponse UpdateService(
         UpdateServiceRequest request
Type: Amazon.ECS.Model.UpdateServiceRequest

Container for the necessary parameters to execute the UpdateService service method.

Return Value
The response from the UpdateService service method, as returned by ECS.


AccessDeniedException You do not have authorization to perform the requested action.
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.
ClusterNotFoundException The specified cluster could not be found. You can view your available clusters with ListClusters. Amazon ECS clusters are region-specific.
InvalidParameterException The specified parameter is invalid. Review the available parameters for the API request.
PlatformTaskDefinitionIncompatibilityException The specified platform version does not satisfy the task definition's required capabilities.
PlatformUnknownException The specified platform version does not exist.
ServerException These errors are usually caused by a server issue.
ServiceNotActiveException The specified service is not active. You can't update a service that is inactive. If you have previously deleted a service, you can re-create it with CreateService.
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.


This example updates the my-http-service service to use the amazon-ecs-sample task definition.

To change the task definition used in a service

var response = client.UpdateService(new UpdateServiceRequest 
    Service = "my-http-service",
    TaskDefinition = "amazon-ecs-sample"


This example updates the desired count of the my-http-service service to 10.

To change the number of tasks in a service

var response = client.UpdateService(new UpdateServiceRequest 
    DesiredCount = 10,
    Service = "my-http-service"


Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

See Also