AdamDang
2a42da0495
* zh-trans: add storage-object-in-use-protection.md(recreation) add storage-object-in-use-protection.md * Update storage-object-in-use-protection.md
443 lines
11 KiB
Markdown
443 lines
11 KiB
Markdown
<!--
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---
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reviewers:
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- msau42
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- jsafrane
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title: Storage Object in Use Protection
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content_template: templates/task
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---
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-->
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---
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reviewers:
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- msau42
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- jsafrane
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title: 保护使用的存储对象
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content_template: templates/task
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---
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{{% capture overview %}}
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<!--
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Persistent volume claims (PVCs) that are in active use by a pod and persistent volumes (PVs) that are bound to PVCs can be protected from premature removal.
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-->
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Kubernetes 可以对被 Pod 持续使用的永久卷声明（PVCs）和绑定到 PVC 的永久卷（PVs）进行保护，以避免它们被用户不小心删除掉。
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{{% /capture %}}
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{{% capture prerequisites %}}
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<!--
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The Storage Object in Use Protection feature is enabled in one of the below Kubernetes versions:
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-->
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在下面列出的 Kubernetes 版本中，激活了在用存储对象的保护特性：
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{{< feature-state for_k8s_version="v1.10" state="beta" >}}
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{{< feature-state for_k8s_version="v1.11" state="stable" >}}
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{{% /capture %}}
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{{% capture steps %}}
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<!--
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## Storage Object in Use Protection feature used for PVC Protection
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The example below uses a GCE PD `StorageClass`, however, similar steps can be performed for any volume type.
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Create a `StorageClass` for convenient storage provisioning:
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-->
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## 在用存储对象的保护功能用于 PVC 的保护
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下面的例子中使用了 GCE PD `StorageClass`, 但是类似的步骤可以在任意的卷类型上执行。
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创建 `StorageClass` 以便提供存储：
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```yaml
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apiVersion: storage.k8s.io/v1
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kind: StorageClass
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metadata:
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name: slow
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provisioner: kubernetes.io/gce-pd
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parameters:
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type: pd-standard
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```
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<!--
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Verification scenarios follow below.
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-->
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下面列出了验证场景。
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<!--
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### Scenario 1: The PVC is not in active use by a pod
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-->
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### 场景1: PVC 没有被 Pod 使用
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<!--
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- Create a PVC:
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-->
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- 创建 PVC
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```yaml
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kind: PersistentVolumeClaim
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apiVersion: v1
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metadata:
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name: slzc
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spec:
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accessModes:
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- ReadWriteOnce
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storageClassName: slow
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resources:
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requests:
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storage: 3.7Gi
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```
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<!--
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- Check that the PVC has the finalizer `kubernetes.io/pvc-protection` set:
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-->
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- 检查 PVC 设置了终结器 `kubernetes.io/pvc-protection`：
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```shell
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kubectl describe pvc slzc
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Name: slzc
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Namespace: default
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StorageClass: slow
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Status: Bound
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Volume: pvc-bee8c30a-d6a3-11e7-9af0-42010a800002
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Labels: <none>
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Annotations: pv.kubernetes.io/bind-completed=yes
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pv.kubernetes.io/bound-by-controller=yes
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volume.beta.kubernetes.io/storage-provisioner=kubernetes.io/gce-pd
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Finalizers: [kubernetes.io/pvc-protection]
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Capacity: 4Gi
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Access Modes: RWO
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Events:
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Type Reason Age From Message
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---- ------ ---- ---- -------
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Normal ProvisioningSucceeded 2m persistentvolume-controller Successfully provisioned volume pvc-bee8c30a-d6a3-11e7-9af0-42010a800002 using kubernetes.io/gce-pd
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```
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<!--
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- Delete the PVC and check that the PVC (not in active use by a pod) was removed successfully.
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-->
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- 删除 PVC 并检查 PVC （当前未被某 Pod 使用）被成功删除。
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<!--
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### Scenario 2: The PVC is in active use by a pod
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- Again, create the same PVC.
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- Create a pod that uses the PVC:
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-->
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### 场景 2: PVC 被 Pod 使用
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- 再来一次，创建相同的 PVC。
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- 创建一个 Pod ，并使用上面创建的 PVC：
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```yaml
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kind: Pod
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apiVersion: v1
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metadata:
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name: app1
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spec:
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containers:
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- name: test-pod
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image: k8s.gcr.io/busybox:1.24
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command:
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- "/bin/sh"
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args:
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- "-c"
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- "date > /mnt/app1.txt; sleep 60 && exit 0 || exit 1"
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volumeMounts:
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- name: path-pvc
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mountPath: "/mnt"
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restartPolicy: "Never"
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volumes:
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- name: path-pvc
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persistentVolumeClaim:
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claimName: slzc
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```
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<!--
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- Wait until the pod status is `Running`, i.e. the PVC becomes in active use.
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- Delete the PVC that is now in active use by a pod and verify that the PVC is not removed but its status is `Terminating`:
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-->
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- 等到 Pod 的状态为 `Running`，即 PVC 变为在用状态。
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- 删除被 Pod 使用的 PVC 并确认其没有被删除成功，但它的状态为 `Terminating`:
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```shell
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Name: slzc
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Namespace: default
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StorageClass: slow
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Status: Terminating (since Fri, 01 Dec 2017 14:47:55 +0000)
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Volume: pvc-803a1f4d-d6a6-11e7-9af0-42010a800002
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Labels: <none>
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Annotations: pv.kubernetes.io/bind-completed=yes
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pv.kubernetes.io/bound-by-controller=yes
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volume.beta.kubernetes.io/storage-provisioner=kubernetes.io/gce-pd
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Finalizers: [kubernetes.io/pvc-protection]
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Capacity: 4Gi
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Access Modes: RWO
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Events:
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Type Reason Age From Message
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---- ------ ---- ---- -------
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Normal ProvisioningSucceeded 52s persistentvolume-controller Successfully provisioned volume pvc-803a1f4d-d6a6-11e7-9af0-42010a800002 using kubernetes.io/gce-pd
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```
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<!--
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- Wait until the pod status is `Terminated` (either delete the pod or wait until it finishes). Afterwards, check that the PVC is removed.
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-->
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- 等到 Pod 的状态变为 `Terminated` （删除 Pod 或者等到它结束），紧接着确认 PVC 被删除掉了。
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<!--
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### Scenario 3: A pod starts using a PVC that is in Terminating state
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- Again, create the same PVC.
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- Create a first pod that uses the PVC:
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-->
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### 场景 3: Pod 开始使用正在停止状态（Terminating）的 PVC
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- 再次创建相同的 PVC。
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- 创建使用这个 PVC 的第一个 Pod：
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```yaml
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kind: Pod
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apiVersion: v1
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metadata:
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name: app1
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spec:
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containers:
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- name: test-pod
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image: k8s.gcr.io/busybox:1.24
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command:
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- "/bin/sh"
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args:
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- "-c"
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- "date > /mnt/app1.txt; sleep 600 && exit 0 || exit 1"
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volumeMounts:
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- name: path-pvc
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mountPath: "/mnt"
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restartPolicy: "Never"
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volumes:
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- name: path-pvc
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persistentVolumeClaim:
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claimName: slzc
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```
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<!--
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- Wait until the pod status is `Running`, i.e. the PVC becomes in active use.
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- Delete the PVC that is now in active use by a pod and verify that the PVC is not removed but its status is `Terminating`:
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-->
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- 等到 Pod 状态为 `Running`，即 PVC 变为使用状态。
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- 删除被 Pod 使用的 PVC 并确认其没有被删除成功，但它的状态为 `Terminating`:
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```shell
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Name: slzc
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Namespace: default
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StorageClass: slow
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Status: Terminating (since Fri, 01 Dec 2017 14:47:55 +0000)
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Volume: pvc-803a1f4d-d6a6-11e7-9af0-42010a800002
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Labels: <none>
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Annotations: pv.kubernetes.io/bind-completed=yes
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pv.kubernetes.io/bound-by-controller=yes
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volume.beta.kubernetes.io/storage-provisioner=kubernetes.io/gce-pd
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Finalizers: [kubernetes.io/pvc-protection]
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Capacity: 4Gi
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Access Modes: RWO
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Events:
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Type Reason Age From Message
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---- ------ ---- ---- -------
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Normal ProvisioningSucceeded 52s persistentvolume-controller Successfully provisioned volume pvc-803a1f4d-d6a6-11e7-9af0-42010a800002 using kubernetes.io/gce-pd
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```
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<!--
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- Create a second pod that uses the same PVC:
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-->
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- 创建使用这个 PVC 的第二个 Pod：
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```yaml
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kind: Pod
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apiVersion: v1
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metadata:
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name: app2
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spec:
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containers:
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- name: test-pod
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image: gcr.io/google_containers/busybox:1.24
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command:
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- "/bin/sh"
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args:
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- "-c"
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- "date > /mnt/app1.txt; sleep 600 && exit 0 || exit 1"
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volumeMounts:
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- name: path-pvc
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mountPath: "/mnt"
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restartPolicy: "Never"
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volumes:
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- name: path-pvc
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persistentVolumeClaim:
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claimName: slzc
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```
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<!--
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- Verify that the scheduling of the second pod fails with the below warning:
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-->
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- 检查第二个 Pod 因为下面的警告而导致调度失败：
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```shell
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Warning FailedScheduling 18s (x4 over 21s) default-scheduler persistentvolumeclaim "slzc" is being deleted
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```
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<!--
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- Wait until the pod status of both pods is `Terminated` or `Completed` (either delete the pods or wait until they finish). Afterwards, check that the PVC is removed.
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-->
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- 等到两个 Pod 的状态为 `Terminated` 或者 `Completed`（删除 Pod 或者等待它们结束），紧接着检查 PVC 被删除掉了。
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<!--
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## Storage Object in Use Protection feature used for PV Protection
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The example below uses a `HostPath` PV.
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Verification scenarios follow below.
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### Scenario 1: The PV is not bound to a PVC
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- Create a PV:
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-->
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## 使用在用存储对象保护的功能来保护 PV
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下面的示例使用了 `HostPath` PV。
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下面列出了验证场景。
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### 场景 1: PV 没有绑定到 PVC
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- 创建 PV:
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```yaml
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kind: PersistentVolume
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apiVersion: v1
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metadata:
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name: task-pv-volume
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labels:
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type: local
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spec:
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capacity:
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storage: 1Gi
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accessModes:
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- ReadWriteOnce
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persistentVolumeReclaimPolicy: Delete
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storageClassName: standard
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hostPath:
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path: "/tmp/data"
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```
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<!--
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- Check that the PV has the finalizer `kubernetes.io/pv-protection` set:
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-->
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- 检查 PV 设置了终结器 `kubernetes.io/pv-protection`：
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```shell
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Name: task-pv-volume
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Labels: type=local
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Annotations: pv.kubernetes.io/bound-by-controller=yes
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Finalizers: [kubernetes.io/pv-protection]
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StorageClass: standard
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Status: Terminating (lasts 1m)
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Claim: default/task-pv-claim
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Reclaim Policy: Delete
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Access Modes: RWO
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Capacity: 1Gi
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Message:
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Source:
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Type: HostPath (bare host directory volume)
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Path: /tmp/data
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HostPathType:
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Events: <none>
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```
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<!--
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- Delete the PV and check that the PV (not bound to a PVC) is removed successfully.
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### Scenario 2: The PV is bound to a PVC
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- Again, create the same PV.
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- Create a PVC
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-->
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- 删除 PV 并检查该 PV（没有绑定到 PVC ）被成功删除。
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### 场景 2: PV 绑定了 PVC。
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- 再次创建相同的 PV。
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- 创建一个 PVC：
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```yaml
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kind: PersistentVolumeClaim
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apiVersion: v1
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metadata:
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name: task-pv-claim
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spec:
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accessModes:
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- ReadWriteOnce
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resources:
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requests:
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storage: 1Gi
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```
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<!--
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- Wait until the PV and PVC are bound to each other.
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- Delete the PV and verify that the PV is not removed but its status is `Terminating`:
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-->
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- 等到 PV 和 PVC 相互绑定。
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- 删除 PV 并确认该 PV 没有被删除掉，但它的状态是 `Terminating`：
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```shell
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NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
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task-pv-volume 1Gi RWO Delete Terminating default/task-pv-claim standard 59s
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```
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<!--
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- Delete the PVC and verify that the PV is removed too.
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-->
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- 删除 PVC 并确认 PV 也一同被删除了。
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```shell
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kubectl delete pvc task-pv-claim
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persistentvolumeclaim "task-pv-claim" deleted
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$ kubectl get pvc
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No resources found.
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$ kubectl get pv
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No resources found.
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```
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|
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{{% /capture %}}
|
||
|
||
{{% capture discussion %}}
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|
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|
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{{% /capture %}}
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