Terraform: Terraform deletion prevention when removing resource from config

[spicykoala]

Is there a way to prevent the deletion of a resource if it accidentally gets removed from the terraform config? 'prevent_destroy' in the lifecycle block seems to only stop resources from being deleted when their changes require deletion, it doesn't seem to have any effect if you accidentally delete the resource from the config and then apply.

Thoughts?

[spicykoala]

resource "aws_sqs_queue" "terraform_queue" {
  name = "terraform-example-queue"
  delay_seconds = 90
  max_message_size = 2048
  message_retention_seconds = 86400
  receive_wait_time_seconds = 10

  lifecycle {
    prevent_destroy = true
  }
}

resource "aws_sqs_queue" "terraform_queue_two" {
  name = "terraform-example-queue-two"
  delay_seconds = 90
  max_message_size = 2048
  message_retention_seconds = 86400
  receive_wait_time_seconds = 10

  lifecycle {
    prevent_destroy = true
  }
}

changing to:

resource "aws_sqs_queue" "terraform_queue_two" {
  name = "terraform-example-queue-two"
  delay_seconds = 90
  max_message_size = 2048
  message_retention_seconds = 86400
  receive_wait_time_seconds = 10

  lifecycle {
    prevent_destroy = true
  }
}

will remove terraform_queue from amazon.

[erichmond]

This doesn't directly answer your question, but we have adjusted the IAM of the terraform user so that it is unable to delete resources we never want deleted.

[spicykoala]

Thanks for the reply - that is the approach we've taken as well. In fact, even if terraform had an option, we'd likely keep it that way as an extra layer of protection. I just wanted to know if it was intended functionality.

[onysan]

Would be great if this feature gets implemented at some point!

[veqryn]

I don't really see the point of prevent_destroy if it doesn't prevent this sort of thing.

Even with prevent_destroy, your resources will still get destroyed if you terraform apply after:
renaming them (and accidentally forget to use state-mv on them)
moving them into a module (and accidentally forget to use state-mv on them)
accidentally deleting them from the tf file

[roidelapluie]

So, I have taken a quick look:

• Currently no meta attributes are persisted into state. We could either persist all of them (I think it would be cool but maybe overhead.) or specifically persist a prevent_permanent_destroy meta attribute.
• We only need to run that check for orphan resources (node_resource_plan_orphan.go) so that should not be too much complex.

[tdmalone]

Potentially duplicated by #17599

[heidemn]

Guys I would really appreciate if you fix this.
I think that this is currently one of the biggest issues with Terraform.

[apparentlymart]

This does indeed seem to be the same thing as #17599. Thanks for pointing that out, @tdmalone! I'm going to close this one to consolidate the discussion over there.

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