google_compute_route doesn't evaluate instance self_link

[seboudry]

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Terraform Version

> terraform -v
Terraform v0.11.10
+ provider.google v1.18.0

Affected Resource(s)

• google_compute_route

Terraform Configuration Files

resource "google_compute_route" "route-self-link" {
  name              = "route-self-link"
  network           = "${google_compute_network.cluster.name}"
  tags              = ["k8s"]

  dest_range        = "0.0.0.0/0"

  next_hop_instance = "${google_compute_instance.nat.self_link}"
  priority          = 700
}

Expected Behavior

Field next_hop_instance with ${google_compute_instance.nat.self_link} as plain text evaluated to corresponding instance value.

Actual Behavior

  + google_compute_route.route-self-link
      id:                                                  <computed>
      dest_range:                                          "0.0.0.0/0"
      name:                                                "route-self-link"
      network:                                             "cluster-net"
      next_hop_instance:                                   "${google_compute_instance.nat.self_link}"
      next_hop_network:                                    <computed>
      priority:                                            "700"
      project:                                             <computed>
      self_link:                                           <computed>
      tags.#:                                              "1"
      tags.1699766702:                                     "k8s"

Steps to Reproduce

1. terraform plan

References

I first tough that my problem was linked to the following issue but it was closed

• google_compute_route forces new resource for next_hop_instance #677

[rileykarson]

Are you getting an error when you run terraform apply? At plan time, Terraform doesn't have enough information to know what the self link is, and it will only be able to interpolate it at apply time.

[rileykarson]

I'm going to close this out because I think it's expected behaviour, but feel free to reopen if you're encountering an error here.

[seboudry]

Hi! Sorry for late response.
Issue solved now (tested with Google provider v1.20.0) even if VM instance not created yet.

Before, I have used a workaround by specifying both instance name (instead of self link) and instance zone:

resource "google_compute_route" "route-self-link" {
  name                   = "route-self-link"
  network                = "${google_compute_network.cluster.name}"
  tags                   = ["k8s"]

  dest_range             = "0.0.0.0/0"

  next_hop_instance      = "${google_compute_instance.nat.name}"
  next_hop_instance_zone = "${google_compute_instance.nat.zone}"
  priority               = 700
}

[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 👉 hashibot-feedback@hashicorp.com. Thanks!