Add support for ECS deployment circuit breakers

[tomelliff]

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Description

AWS has announced ECS deployment circuit breakers that can automatically roll back a failed deployment: https://aws.amazon.com/blogs/containers/announcing-amazon-ecs-deployment-circuit-breaker/

New or Affected Resource(s)

• aws_ecs_service

Potential Terraform Configuration

resource "aws_ecs_service" "bar" {
  name                = "bar"
  cluster             = aws_ecs_cluster.foo.id
  task_definition     = aws_ecs_task_definition.bar.arn
  scheduling_strategy = "DAEMON"

  deployment_configuration = {
    maximum_percent = 200
    minimum_healthy_percent = 100

    deployment_circuit_breaker = {
      enabled  = true
      rollback = true
    }
  }
}

I'm not a massive fan of that API layout and would love it to be as simple as enable_deployment_circuit_breaker = true as a top level thing but I think the general pattern here is to have Terraform follow the AWS API and then people can abstract that behind modules if that works for them. That way if the API changes it doesn't cause breaking changes in the provider to support the new functionality.

References

• https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_DeploymentConfiguration.html

[mkielar]

I'm considering using this feature in our automated pipelines, and was wondering how will this be implemented in terraform:

1. Would terraform wait for the success/failure/rollback of the service deployment?
2. If rollback is disabled, would terraform apply fail if service deployment fails due to circuit breaker?
3. If rollback is enabled, would terraform treat a successful rollback as a success or failure? I.e., would a successful rollback fail terraform apply?
4. If rollback is enabled, would terraform update the state after rollback to reflect infrastructure status?

[zhenglisai]

when this feature can terraform support?

[shuheiktgw]

Let me see if I can implement it. It seems the current aws-sdk-go already supports DeploymentCircuitBreaker configuration.

[shuheiktgw]

I've implemented it so please upvote the PR for a faster review! 🙏
#16936

[anagarjunr]

waiting for this feature

This has been released in version 3.35.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!