在学习Operator的时候，使用kubectl创建了一个namespace，但是删除的时候无法被删除，状态一直是Terminating；

➜  ~ kubectl get ns  pgy
NAME   STATUS        AGE
pgy    Terminating   13d

强制删除也不行，

➜  ~ kubectl delete ns  pgy  --force --grace-period=0
warning: Immediate deletion does not wait for confirmation that the running resource has been terminated. The resource may continue to run on the cluster indefinitely.
namespace "pgy" force deleted

查了一下，发现了一些原因；

➜  ~ kubectl get ns pgy -o json

{
    "apiVersion": "v1",
    "kind": "Namespace",
    "metadata": {
        "creationTimestamp": "2020-12-30T06:55:43Z",
        "deletionTimestamp": "2020-12-30T06:55:56Z",
        "name": "pgy",
        "resourceVersion": "28873309",
        "selfLink": "/api/v1/namespaces/pgy",
        "uid": "1a281f10-bc1c-46ef-8c92-db6b865c7293"
    },
    "spec": {
        "finalizers": [
            "kubernetes"
        ]
    },
    "status": {
        "phase": "Terminating"
    }
}

里面的这个finalizers不为空，导致无法删除，查了一下资料 NamespaceSpec v1 core Spec；这个参数的意义乃是说，只有其为空的时候，才会被删除，它存在的目的

那怎么删除呢？将其更新为空即可，使用其API接口，添加k8s证书即可

curl --location --request PUT 'https://10.0.4.175:6443/api/v1/namespaces/aa/finalize' \
--header 'Content-Type: application/json' \
--data-raw '{
    "apiVersion": "v1",
    "kind": "Namespace",
    "metadata": {
        "creationTimestamp": "2020-12-30T06:55:43Z",
        "deletionTimestamp": "2020-12-30T06:55:56Z",
        "name": "pgy",
        "resourceVersion": "28873309",
        "selfLink": "/api/v1/namespaces/pgy",
        "uid": "1a281f10-bc1c-46ef-8c92-db6b865c7293"
    },
    "spec": {
        "finalizers": [
        ]
    },
    "status": {
        "phase": "Terminating"
    }
}'