# Amazon ECS service revisions
<a name="service-revision"></a>

A service revision contains a record of the workload configuration Amazon ECS is attempting to deploy. Whenever you create or deploy a service, Amazon ECS automatically creates and captures the configuration that you're trying to deploy in the service revision.

 Service revisions are read-only and have unique identifiers. For information about the included properties, see [Properties included in an Amazon ECS service revision](service-revision-property.md).

 Service revisions provide the following benefits:
+ During a service deployment, you can compare the currently deployed service revision (source) with the one being deployed (target).
+ When you use the rollback option for a service deployment, Amazon ECS automatically rolls back the service deployment to the last successfully deployed service revision.
+ Service revisions contain the record of the workload configuration in one resource. 

## Service revision lifecycle
<a name="service-revisions-lifecycle"></a>

Amazon ECS automatically creates a new service revision when you create a service, or update a service property that starts a deployment.

 Amazon ECS doesn't create a new service revision for a rollback operation. Amazon ECS uses the last successful service revision for the rollback. 

A service revision is immutable.

Amazon ECS deletes the service revision when you delete a service.

You can view service revisions created on or after October 25, 2024 by using the console, API, and the CLI.