AWS SDK Version 3 for .NET
API Reference

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Deregisters the specified task definition by family and revision. Upon deregistration, the task definition is marked as INACTIVE. Existing tasks and services that reference an INACTIVE task definition continue to run without disruption. Existing services that reference an INACTIVE task definition can still scale up or down by modifying the service's desired count.

You cannot use an INACTIVE task definition to run new tasks or create new services, and you cannot update an existing service to reference an INACTIVE task definition (although there may be up to a 10-minute window following deregistration where these restrictions have not yet taken effect).

At this time, INACTIVE task definitions remain discoverable in your account indefinitely; however, this behavior is subject to change in the future, so you should not rely on INACTIVE task definitions persisting beyond the lifecycle of any associated tasks and services.


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

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


public virtual DeregisterTaskDefinitionResponse DeregisterTaskDefinition(
         DeregisterTaskDefinitionRequest request
Type: Amazon.ECS.Model.DeregisterTaskDefinitionRequest

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

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


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.
InvalidParameterException The specified parameter is invalid. Review the available parameters for the API request.
ServerException These errors are usually caused by a server issue.

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