Kuberntes 中無法刪除 PV 的解決方法

Kuberntes 中無法刪除 PV 的解決方法

一 背景

系統內有一個已經不再使用的 PV ，已經刪除了與其關聯的 Pod 及 PVC ，並對其執行了刪除命令，但是無法正常刪除，一直出於如下狀態：

$ kubectl get pv
NAME          CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS        CLAIM                                    STORAGECLASS          REASON   AGE
pv-nfs-gysl   1Gi        RWO            Recycle          Terminating   default/www-vct-statefulset-pvc-gysl-0   managed-nfs-storage            22h

二 解決方法

$ kubectl patch pv pv-nfs-gysl -p '{"metadata":{"finalizers":null}}'
persistentvolume/pv-nfs-gysl patched
$ kubectl get pv
No resources found.

通過系統幫助信息，我們可以獲取patch的簡要使用說明：

patch： 使用 strategic merge patch 更新一個資源的 field(s)。

更多幫助信息：

# kubectl patch -h
Update field(s) of a resource using strategic merge patch, a JSON merge patch, or a JSON patch.

 JSON and YAML formats are accepted.

Examples:
  # Partially update a node using a strategic merge patch. Specify the patch as JSON.
  kubectl patch node k8s-node-1 -p '{"spec":{"unschedulable":true}}'

  # Partially update a node using a strategic merge patch. Specify the patch as YAML.
  kubectl patch node k8s-node-1 -p $'spec:\n unschedulable: true'

  # Partially update a node identified by the type and name specified in "node.json" using strategic merge patch.
  kubectl patch -f node.json -p '{"spec":{"unschedulable":true}}'

  # Update a container's image; spec.containers[*].name is required because it's a merge key.
  kubectl patch pod valid-pod -p '{"spec":{"containers":[{"name":"kubernetes-serve-hostname","image":"new image"}]}}'

  # Update a container's image using a json patch with positional arrays.
  kubectl patch pod valid-pod --type='json' -p='[{"op": "replace", "path": "/spec/containers/0/image", "value":"new
image"}]'

Options:
      --allow-missing-template-keys=true: If true, ignore any errors in templates when a field or map key is missing in
the template. Only applies to golang and jsonpath output formats.
      --dry-run=false: If true, only print the object that would be sent, without sending it.
  -f, --filename=[]: Filename, directory, or URL to files identifying the resource to update
  -k, --kustomize='': Process the kustomization directory. This flag can't be used together with -f or -R.
      --local=false: If true, patch will operate on the content of the file, not the server-side resource.
  -o, --output='': Output format. One of:
json|yaml|name|go-template|go-template-file|template|templatefile|jsonpath|jsonpath-file.
  -p, --patch='': The patch to be applied to the resource JSON file.
      --record=false: Record current kubectl command in the resource annotation. If set to false, do not record the
command. If set to true, record the command. If not set, default to updating the existing annotation value only if one
already exists.
  -R, --recursive=false: Process the directory used in -f, --filename recursively. Useful when you want to manage
related manifests organized within the same directory.
      --template='': Template string or path to template file to use when -o=go-template, -o=go-template-file. The
template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview].
      --type='strategic': The type of patch being provided; one of [json merge strategic]

Usage:
  kubectl patch (-f FILENAME | TYPE NAME) -p PATCH [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).