How to force delete a Kubernetes Namespace?

The kubectl proxy try is almost correct, but not quite. It’s possible using JSON instead of YAML does the trick, but I’m not certain.

The JSON with an empty finalizers list:

~$ cat ns.json

{
  "kind": "Namespace",
  "apiVersion": "v1",
  "metadata": {
    "name": "delete-me"
  },
  "spec": {
    "finalizers": []
  }
}

Use curl to PUT the object without the problematic finalizer.

~$ curl -k -H "Content-Type: application/json" -X PUT --data-binary @ns.json http://127.0.0.1:8007/api/v1/namespaces/delete-me/finalize

{
  "kind": "Namespace",
  "apiVersion": "v1",
  "metadata": {
    "name": "delete-me",
    "selfLink": "/api/v1/namespaces/delete-me/finalize",
    "uid": "0df02f91-6782-11e9-8beb-42010a800137",
    "resourceVersion": "39047",
    "creationTimestamp": "2019-04-25T17:46:28Z",
    "deletionTimestamp": "2019-04-25T17:46:31Z",
    "annotations": {
      "kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"v1\",\"kind\":\"Namespace\",\"metadata\":{\"annotations\":{},\"name\":\"delete-me\"},\"spec\":{\"finalizers\":[\"foregroundDeletion\"]}}\n"
    }
  },
  "spec": {

  },
  "status": {
    "phase": "Terminating"
  }
}

The Namespace is deleted!

~$ kubectl get ns delete-me

Error from server (NotFound): namespaces "delete-me" not found