google_compute_instance_template: Error: doesn't support update

[dpogorzelski]

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Terraform Version

0.14.1

Affected Resource(s)

• google_compute_instance_template

Terraform Configuration Files

resource "google_compute_instance_template" "test" {
  name_prefix = "${var.env}-${replace(var.role, "_", "-")}-"

  tags = [
    var.env,
  ]

  labels = {
    env      = var.env
  }

  machine_type = var.size

  scheduling {
    automatic_restart = true
  }

  disk {
    source_image = var.build != "" ? "aproject/test-${replace(var.role, "_", "-")}-${var.build}" : "aproject/test-${replace(var.role, "_", "-")}"
    auto_delete  = true
    boot         = true
    disk_type    = "pd-standard"
  }

  network_interface {
    network = var.vpc_name
    access_config {
      nat_ip = ""
    }
  }



  metadata = {
    role                         = var.role
    env                          = var.env
  }

  service_account {
    email = var.compute_service_account.email
    scopes = [
      "cloud-platform",
    ]
  }

  lifecycle {
    create_before_destroy = true
  }
}

Debug Output

  # module.mymodule.google_compute_instance_template.test will be updated in-place
  ~ resource "google_compute_instance_template" "test" {
        id                   = "projects/arpoject/global/instanceTemplates/myenv-myservice-20201208204739443400000010"
        name                 = "myenv-myservice-20201208204739443400000010"
        tags                 = [
            "myenv",
        ]
        # (12 unchanged attributes hidden)




        # (4 unchanged blocks hidden)
    }

...........

Error: doesn't support update

Expected Behavior

When running consecutive apply/plan steps there should be no diff

Actual Behavior

An attempt to "update" the template is performed even though there are no changes to the template.
The second issue with this is that templates cannot be updated, new one should be created instead.

Steps to Reproduce

1. terraform apply
2. terraform apply

[edwardmedia]

@dawidpogorzelski this is by design. GCP API does not support update. Please close the issue if this makes sense to you

[dpogorzelski]

Well there's 2 issue with the above code,
first that there is a change detected even tho there was no change made but somehow the resource is marked to be updated.
The second is that the provider attempts to update the resource in place even tho the api doesn't allow it. the google provider should destroy and recreate the resource, that's how it used to be prior to 0.14.0. This issue only happens from terraform 0.14.0 on

[edwardmedia]

@dawidpogorzelski oh I see. Probably there is not much we can do with it within the provider plugin. Mind file an issue with Terraform against 0.14.0 instead?

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!