创建如下命名空间json文件，替换命名空间名称即可

~$ cat ns.json

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

使用k8s原生接口删除

~$ kubectl proxy --port=8000
~$ curl -k -H "Content-Type: application/json" -X PUT --data-binary @ns.json http://127.0.0.1:8000/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"
  }
}

检查是否删除成功

~$ kubectl get ns delete-me