Cannot create ingress in a different namespace than the backend

[goobysnack]

Terraform Version, Provider Version and Kubernetes Version

Terraform version: v0.12.28
Kubernetes provider version: 2.02
Kubernetes version: 1.18.12

Affected Resource(s)

• kubernetes_ingress

Terraform Configuration Files

I removed the other data blocks as they are working fine.

data "kubernetes_service" "service" {
  metadata {
    name = "hellonode"
    namespace = "default"
  }
}

resource "kubernetes_ingress" "ingress" {
  depends_on = [google_compute_global_address.vs_address]
  wait_for_load_balancer = true
  metadata {
    name = "hello-test3-foo-io"
    //namespace = "edge" <-- I'd like to create the ingress in this namespace and use a backend service in default
    annotations = {
      "kubernetes.io/ingress.global-static-ip-name" = google_compute_global_address.vs_address.name
      "kubernetes.io/ingress.class" = "gce"  
    }
  }

  spec {
    backend {
      service_name = data.kubernetes_service.service.metadata.0.name
      service_port = 80
    }
  }
}

Debug Output

no gist

Panic Output

none

Steps to Reproduce

Expected Behavior

ingress created in edge namespace with backend in default

Actual Behavior

This error:
"Translation failed: invalid ingress spec: could not find service "edge/hellonode""
It's looking for the service name in the same namespace instead of using the default based on the data resource:

Important Factoids

None

References

None

Community Note

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[goobysnack]

If I put the namespace in the name, it gives this error:

service_name = "default/${data.kubernetes_service.service.metadata.0.name}"

Error: Failed to create Ingress 'edge/hello-test3-foo-io' because: Ingress.extensions "hello-test3-foo-io" is invalid: spec.backend.serviceName: Invalid value: "default/hellonode": a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character (e.g. 'my-name',  or 'abc-123', regex used for validation is '[a-z]([-a-z0-9]*[a-z0-9])?')

[jrhouston]

Thanks for opening this @goobysnack – unfortunately this is not possible and is a limitation of this API. The documentation says the backend must be in the same namespace as the ingress so this is not something we can change in Terraform.

There is a closed issue about this on the Kubernetes repo for context: kubernetes/kubernetes#17088

[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!