Max utilization is not supported for Serverless network endpoint groups.

[icco]

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Terraform Version

Terraform v0.13.0
+ provider registry.terraform.io/-/google v3.35.0
+ provider registry.terraform.io/-/google-beta v3.35.0
+ provider registry.terraform.io/-/null v2.1.2
+ provider registry.terraform.io/-/random v2.3.0
+ provider registry.terraform.io/hashicorp/google v3.35.0
+ provider registry.terraform.io/hashicorp/google-beta v3.35.0
+ provider registry.terraform.io/hashicorp/null v2.1.2
+ provider registry.terraform.io/hashicorp/random v2.3.0

Affected Resource(s)

• google_compute_backend_service
• google_compute_region_network_endpoint_group

Terraform Configuration Files

This is a simplified config that triggers the bug. A full example can be found at google/exposure-notifications-verification-server#248

resource "google_compute_region_network_endpoint_group" "cloudrun_neg" {
  provider              = google-beta
  name                  = "cloudrun-neg"
  network_endpoint_type = "SERVERLESS"
  region                = "us-central1"
  cloud_run {
    service = google_cloud_run_service.cloudrun_neg.name
  }
}

resource "google_cloud_run_service" "cloudrun_neg" {
  provider = google-beta
  name     = "cloudrun-neg"
  location = "us-central1"

  template {
    spec {
      containers {
        image = "gcr.io/cloudrun/hello"
      }
    }
  }

  traffic {
    percent         = 100
    latest_revision = true
  }
}

resource "google_compute_backend_service" "example" {
  provider   = google-beta
  name       = "example"
  project    = var.project

  backend {
    group = google_compute_region_network_endpoint_group.cloudrun_neg.id
  }
}

Debug Output

https://gist.github.com/icco/0e29297c1cb2e8e47b9c0759c1f84c87

Panic Output

Expected Behavior

Actual Behavior

Error: Error creating BackendService: googleapi: Error 400: Invalid value for field 'resource.backends[0].maxUtilization': '0.8'. Max utilization is not supported for Serverless network endpoint groups., invalid

  on main.tf line 78, in resource "google_compute_backend_service" "example":
  78: resource "google_compute_backend_service" "example" {

Steps to Reproduce

1. terraform apply

Important Factoids

With the new serverless endpoint type, the default values we send are no longer valid.

References

• #0000

[slevenick]

Ah yeah, I made this work specifically for global NEGs based on inferring type from their URL. A similar check will be needed for regional NEGs

[iangelov]

I attempted setting max_utilization (which is documented as being optional) to null (from its default value of 0.8), but to no avail.

[icco]

This is still happening in 3.36 @slevenick

[slevenick]

@icco it looks like this was merged just after the 3.36 release was cut. It will be in the 3.37 release expected next monday

[icco]

Is there any way I can test it or use it before then? I ask because we have a big release next week, and if there are bugs I'd love to not wait another week.

[slevenick]

Yes! You can build the provider from source and use it locally.

Directions are here: https://github.com/hashicorp/terraform-provider-google#building-the-provider
and here: https://github.com/hashicorp/terraform-provider-google/blob/master/.github/CONTRIBUTING.md#running-a-local-copy-of-the-provider

[n-oden]

Small note on this: while it works, the maxUtilization etc values are still shown in the terraform plan output.

[slevenick]

Yeah, that's due to maxUtilization having a default value. It's tricky to remove without causing a breaking change, so I went with leaving it in the plan but stripping it from the request for serverless NEGs

[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!