google_compute_vpn_tunnel always recreated

[cinder-fish]

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Terraform Version

Terraform v0.12.13
provider-google v2.19.0
provider-google-beta v2.19.0

Affected Resource(s)

• google_compute_vpn_tunnel

Terraform Configuration Files

resource "google_compute_vpn_tunnel" "tunnel1_from" {
  provider              = google-beta
  project               = var.from.project
  name                  = "${var.name}-1"
  region                = var.region
  vpn_gateway           = google_compute_ha_vpn_gateway.gateway_from.self_link
  peer_gcp_gateway      = google_compute_ha_vpn_gateway.gateway_to.self_link
  shared_secret         = var.vpn_secret
  router                = google_compute_router.vpn_router_from.self_link
  vpn_gateway_interface = 0
}

Debug Output

Plan summary:

  # module.omnienv-prod-vpn.google_compute_vpn_tunnel.tunnel2_from must be replaced
-/+ resource "google_compute_vpn_tunnel" "tunnel2_from" {
      ~ creation_timestamp              = "2019-12-02T07:05:05.555-08:00" -> (known after apply)
      ~ detailed_status                 = "Tunnel is up and running." -> (known after apply)
      ~ id                              = "bcp-to-omnienv-prod-2" -> (known after apply)
        ike_version                     = 2
      ~ label_fingerprint               = "42WmSpB8rSM=" -> (known after apply)
      - labels                          = {} -> null
      ~ local_traffic_selector          = [
          - "0.0.0.0/0",
        ] -> (known after apply)
        name                            = "bcp-to-omnienv-prod-2"
      - peer_external_gateway_interface = 0 -> null
        peer_gcp_gateway                = "https://www.googleapis.com/compute/v1/projects/at-infrastructure-omnienv-prod/regions/europe-west1/vpnGateways/bcp-to-omnienv-prod-gateway"
      ~ peer_ip                         = "35.220.106.180" -> (known after apply)
        project                         = "at-delivery-platform-bcp"
        region                          = "europe-west1"
      ~ remote_traffic_selector         = [
          - "0.0.0.0/0",
        ] -> (known after apply)
        router                          = "https://www.googleapis.com/compute/v1/projects/at-delivery-platform-bcp/regions/europe-west1/routers/bcp-to-omnienv-prod-vpn-router"
      ~ self_link                       = "https://www.googleapis.com/compute/v1/projects/at-delivery-platform-bcp/regions/europe-west1/vpnTunnels/bcp-to-omnienv-prod-2" -> (known after apply)
      ~ shared_secret                   = (sensitive value)
      ~ shared_secret_hash              = "*****" -> (known after apply)
      ~ tunnel_id                       = "793041773261264590" -> (known after apply)
        vpn_gateway                     = "https://www.googleapis.com/compute/v1/projects/at-delivery-platform-bcp/regions/europe-west1/vpnGateways/bcp-to-omnienv-prod-gateway"
        vpn_gateway_interface           = 1
    }

Plan: 1 to add, 0 to change, 1 to destroy.

Panic Output

N/A (no panic)

Expected Behavior

The resource is not changed in subsequent plans that have the same input

Actual Behavior

A difference is detected and the resource is planned to be deleted and recreated

Steps to Reproduce

1. terraform apply
2. terraform plan without any changes after the resource has been created

Important Factoids

This is between two GCP projects / regions, so there are mirrored configurations of router, vpn_gateway, interface, peer, tunnel resources in each.

None of the other resources types are appearing as changed (e.g. like the linked router or gateways), only the tunnel resources.

As in other issues can see fields like localTrafficSelector coming back as set in the GCP responses in the debug output

References

These appear to be similar previous issues:

#1963
#2336

• #0000

[cinder-fish]

Closing as I believe we've found our issue, the shared_secret value was different in our CI pipeline

[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!