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user2375592
Asked: 2021-01-09 09:59:54 +0800 CST

AWS ECS task definition workflow

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I've setup one of my services to be deployed to ECS (EC2). I have the service and task definition configured via terraform and then to deploy I'm using Github actions where it seems I need to define the task definition again.

It seems both are required, what would be the correct workflow so I can remove the duplicate task definition?

There's also the problem of once this task definition has been deployed via Github actions, the image has been updated which terraform wants to revert.

amazon-ecs terraform github-actions

1 Answers

  1. This is an old one but for future reference.

    The first one is required in order to bring up the service initially (while creating your pre-configured cluster).

    You can consider the second one as an option to update your service (deploy a new version of the image) over the initial one during your GitHub Actions deployment (as you can change the image id and basically everything that you have as a configuration option in the task definition).

    With regard to terraform you can add a lifecycle rule to ignore any changes to the pre-configured image_id with something like this in the aws_ecs_service:

      lifecycle {
    ignore_changes = [task_definiton]
  }

    There is quite an old issue in the terraform-provider-aws project with regard to how it handles task definition changes. Take a look at this comment for a possible workaround for your use case (blog post on topic from the comment author).

    Down below you can see another comment linking a ready-to-go Github Actions solution with a terraform code example.

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