Tasks

Step-by-step instructions for performing operations with Kubernetes.

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FEATURE STATE: Kubernetes v1.9 alpha

This feature is currently in a alpha state, meaning:

  • The version names contain alpha (e.g. v1alpha1).
  • Might be buggy. Enabling the feature may expose bugs. Disabled by default.
  • Support for feature may be dropped at any time without notice.
  • The API may change in incompatible ways in a later software release without notice.
  • Recommended for use only in short-lived testing clusters, due to increased risk of bugs and lack of long-term support.

从 Kubernetes 1.9 版本起,用户可以对正在被 pod 使用的 persistent volume claim(PVC)进行保护, 防止其在使用结束前被移除。

Before you begin

PVC 保护验证

下面的示例使用了 GCE PD StorageClass,然而,您可以按照类似的步骤对任何 volume 类型执行操作:

为方便存储供应(provisioning),创建一个 StorageClass

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: slow
provisioner: kubernetes.io/gce-pd
parameters:
  type: pd-standard

存在两种场景: 用户所删除的 PVC 正在被 pod 使用,或没有在被 pod 使用。

场景 1:PVC 没有在被 pod 使用

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: slzc
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: slow
  resources:
    requests:
      storage: 3.7Gi

场景 2:PVC 在被 pod 使用

kind: Pod
apiVersion: v1
metadata:
  name: app1
spec:
  containers:
  - name: test-pod
    image: k8s.gcr.io/busybox:1.24
    command:
      - "/bin/sh"
    args:
      - "-c"
      - "date > /mnt/app1.txt; sleep 60 && exit 0 || exit 1"
    volumeMounts:
      - name: path-pvc
        mountPath: "/mnt"
  restartPolicy: "Never"
  volumes:
    - name: path-pvc
      persistentVolumeClaim:
        claimName: slzc
Name:          slzc
Namespace:     default
StorageClass:  slow
Status:        Terminating (since Fri, 01 Dec 2017 14:47:55 +0000)
Volume:        pvc-803a1f4d-d6a6-11e7-9af0-42010a800002
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed=yes
               pv.kubernetes.io/bound-by-controller=yes
               volume.beta.kubernetes.io/storage-provisioner=kubernetes.io/gce-pd
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      4Gi
Access Modes:  RWO
Events:
  Type    Reason                 Age   From                         Message
  ----    ------                 ----  ----                         -------
  Normal  ProvisioningSucceeded  52s   persistentvolume-controller  Successfully provisioned volume pvc-803a1f4d-d6a6-11e7-9af0-42010a800002 using kubernetes.io/gce-pd

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