• Rename resources from the terraform state

    3 min read

    terraform refactor state move resource Infrastructure as Code

    When handling Infrastructure as Code (IaC) with terraform, refactoring the code might cause terraform to try to delete the existing resources an recreate them using a different name:

      # module.jenkins.module.worker.module.kms-parameter-store.aws_iam_policy.kms_read_policy will be destroyed
  # module.jenkins.module.worker.module.kms-parameter-store.aws_iam_policy.ssm_read_policy will be destroyed
  # module.jenkins.module.worker.module.kms-parameter-store.aws_iam_role_policy_attachment.kms_read_policy_attachment will be destroyed
  # module.jenkins.module.worker.module.kms-parameter-store.aws_iam_role_policy_attachment.ssm_role_policy_attachment will be destroyed
  # module.jenkins.module.worker.module.kms-parameter-store.aws_kms_alias.kms_key_alias will be destroyed
  # module.jenkins.module.worker.module.kms-parameter-store.aws_kms_key.kms_key will be destroyed

  # module.jenkins.module.worker[0].module.kms-parameter-store.aws_iam_policy.kms_read_policy will be created
  # module.jenkins.module.worker[0].module.kms-parameter-store.aws_iam_policy.ssm_read_policy will be created
  # module.jenkins.module.worker[0].module.kms-parameter-store.aws_iam_role_policy_attachment.kms_read_policy_attachment will be created
  # module.jenkins.module.worker[0].module.kms-parameter-store.aws_iam_role_policy_attachment.ssm_role_policy_attachment will be created
  # module.jenkins.module.worker[0].module.kms-parameter-store.aws_kms_alias.kms_key_alias will be created
  # module.jenkins.module.worker[0].module.kms-parameter-store.aws_kms_key.kms_key will be created

    While in some cases it's just fine to destroy the resources and recreate them back, in other cases it can cause a undesired service interruption just for deleting all the resources and recreate them back exactly with the same settings using slightly different name on the terraform state.

    We can avoid it by renaming the resources in the terraform state to the name terraform is expecting

    23/04/2021

    Read more...

From pet to cattle
Treat your kubernetes clusters like cattle, not pets