CODEWITHSUNDEEP
amazon-web-servicesaws-cloudformationamazon-ecs
Kurt
Kurt

Reputation: 78

How to Update AWS::ECS::Service to Fargate launch type

I have an app currently running in ECS, and am attempting to upgrade it to use the Fargate launch type.

After updating my cloudformation template, and attempting to update the stack, I am getting an error that the service already exists.

Resource handler returned message: "Resource of type 'AWS::ECS::Service' with identifier 'redacted-app-name' already exists." (RequestToken: 50118296-f55c-11eb-a6e3-b31cdb2b43da, HandlerErrorCode: AlreadyExists)

I assume that by adding either the LaunchType or NetworkConfiguration keys to my service ECS thinks this is a different service.

Any ideas on how to best move forward without having to delete the ECS service or Cloudformation Stack? I am looking for a solution with minimal downtime.

Thanks!

Upvotes: 3

Views: 1481

Answers (1)

Marcin
Marcin

Reputation: 238051

Sadly chancing LaunchType requires replacement of the services. So you will have downtime.

The only way around this is to do blue/green type of deployment, where you deploy new service in Fargate, and perform redirection of traffic through R53 from old service to new one.

Similarly, changes to ServiceName require replacement.

Upvotes: 2

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