名前空間の状態確認

admin@cluster-node:~$ kubectl get namespaces
NAME              STATUS        AGE
cert-manager      Terminating   19h

該当名前空間内のリソース確認

kubectl get all --all-namespaces | grep cert-manager
# または
kubectl api-resources --verbs=list --namespaced -o name | xargs -r -I {} kubectl get {} -n cert-manager --ignore-not-found

名前空間詳細情報の取得

admin@cluster-node:~$ kubectl get namespace cert-manager -o json > termination-ns.json

JSON構成の編集

取得したJSONファイルからfinalizersセクションを削除します：

{
    "apiVersion": "v1",
    "kind": "Namespace",
    "metadata": {
        "annotations": {
            "kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"v1\",\"kind\":\"Namespace\",\"metadata\":{\"annotations\":{},\"name\":\"cert-manager\"}}"
        },
        "creationTimestamp": "2023-11-13T12:55:45Z",
        "deletionTimestamp": "2023-11-14T08:18:44Z",
        "labels": {
            "kubernetes.io/metadata.name": "cert-manager"
        },
        "name": "cert-manager",
        "resourceVersion": "8393161",
        "uid": "ec907f95-068f-4f82-8adb-401e4fbbef39"
    },
    // 次のセクションを削除
    // "spec": {
    //     "finalizers": [
    //         "kubernetes"
    //     ]
    // },
    "status": {
        "conditions": [
            {
                "lastTransitionTime": "2023-11-14T08:18:50Z",
                "message": "All resources successfully discovered",
                "reason": "ResourcesDiscovered",
                "status": "False",
                "type": "NamespaceDeletionDiscoveryFailure"
            },
            {
                "lastTransitionTime": "2023-11-14T08:18:50Z",
                "message": "All legacy kube types successfully parsed",
                "reason": "ParsedGroupVersions",
                "status": "False",
                "type": "NamespaceDeletionGroupVersionParsingFailure"
            },
            {
                "lastTransitionTime": "2023-11-14T08:18:50Z",
                "message": "Failed to delete all resource types, 1 remaining: Internal error occurred: error resolving resource",
                "reason": "ContentDeletionFailed",
                "status": "True",
                "type": "NamespaceDeletionContentFailure"
            },
            {
                "lastTransitionTime": "2023-11-14T08:18:50Z",
                "message": "All content successfully removed",
                "reason": "ContentRemoved",
                "status": "False",
                "type": "NamespaceContentRemaining"
            },
            {
                "lastTransitionTime": "2023-11-14T08:18:50Z",
                "message": "All content-preserving finalizers finished",
                "reason": "ContentHasNoFinalizers",
                "status": "False",
                "type": "NamespaceFinalizersRemaining"
            }
        ],
        "phase": "Terminating"
    }
}

APIプロキシの起動

admin@cluster-node:~$ kubectl proxy
Starting to serve on 127.0.0.1:8001

API経由での強制削除実行

# finalizersを除去したJSONを使用して更新
admin@cluster-node:~$ curl -H "Content-Type: application/json" -X PUT --data-binary @termination-ns.json http://127.0.0.1:8001/api/v1/namespaces/cert-manager/finalize