4.8. 备份持久性卷声明

您可以从容器内部将持久数据同步到服务器。

重要

根据托管 OpenShift Container Platform 环境的供应商，也可以为备份和恢复目的启动第三方快照服务。因为 OpenShift Container Platform 没有能够启动这些服务，所以本指南并不描述了这些步骤。

如需特定应用程序的正确备份流程，请参阅任何产品文档。例如，复制 mysql 数据目录本身并不会创建可用的备份。反之，运行关联的应用程序的特定备份过程，然后同步任何数据。这包括使用 OpenShift Container Platform 托管平台提供的快照解决方案。

流程

查看项目和 pod：

oc get pods
NAME           READY     STATUS      RESTARTS   AGE
demo-1-build   0/1       Completed   0          2h
demo-2-fxx6d   1/1       Running     0          1h

$ oc get pods
NAME           READY     STATUS      RESTARTS   AGE
demo-1-build   0/1       Completed   0          2h
demo-2-fxx6d   1/1       Running     0          1h

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描述所需的 pod，以查找持久性卷目前使用的卷：

oc describe pod demo-2-fxx6d
Name:			demo-2-fxx6d
Namespace:		test
Security Policy:	restricted
Node:			ip-10-20-6-20.ec2.internal/10.20.6.20
Start Time:		Tue, 05 Dec 2017 12:54:34 -0500
Labels:			app=demo
			deployment=demo-2
			deploymentconfig=demo
Status:			Running
IP:			172.16.12.5
Controllers:		ReplicationController/demo-2
Containers:
  demo:
    Container ID:	docker://201f3e55b373641eb36945d723e1e212ecab847311109b5cee1fd0109424217a
    Image:		docker-registry.default.svc:5000/test/demo@sha256:0a9f2487a0d95d51511e49d20dc9ff6f350436f935968b0c83fcb98a7a8c381a
    Image ID:		docker-pullable://docker-registry.default.svc:5000/test/demo@sha256:0a9f2487a0d95d51511e49d20dc9ff6f350436f935968b0c83fcb98a7a8c381a
    Port:		8080/TCP
    State:		Running
      Started:		Tue, 05 Dec 2017 12:54:52 -0500
    Ready:		True
    Restart Count:	0
    Volume Mounts:
      */opt/app-root/src/uploaded from persistent-volume (rw)*
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-8mmrk (ro)
    Environment Variables:	<none>
...omitted...

$ oc describe pod demo-2-fxx6d
Name:			demo-2-fxx6d
Namespace:		test
Security Policy:	restricted
Node:			ip-10-20-6-20.ec2.internal/10.20.6.20
Start Time:		Tue, 05 Dec 2017 12:54:34 -0500
Labels:			app=demo
			deployment=demo-2
			deploymentconfig=demo
Status:			Running
IP:			172.16.12.5
Controllers:		ReplicationController/demo-2
Containers:
  demo:
    Container ID:	docker://201f3e55b373641eb36945d723e1e212ecab847311109b5cee1fd0109424217a
    Image:		docker-registry.default.svc:5000/test/demo@sha256:0a9f2487a0d95d51511e49d20dc9ff6f350436f935968b0c83fcb98a7a8c381a
    Image ID:		docker-pullable://docker-registry.default.svc:5000/test/demo@sha256:0a9f2487a0d95d51511e49d20dc9ff6f350436f935968b0c83fcb98a7a8c381a
    Port:		8080/TCP
    State:		Running
      Started:		Tue, 05 Dec 2017 12:54:52 -0500
    Ready:		True
    Restart Count:	0
    Volume Mounts:
      */opt/app-root/src/uploaded from persistent-volume (rw)*
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-8mmrk (ro)
    Environment Variables:	<none>
...omitted...

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此输出显示持久性数据位于 /opt/app-root/src/uploaded 目录中。

在本地复制数据：

oc rsync demo-2-fxx6d:/opt/app-root/src/uploaded ./demo-app
receiving incremental file list
uploaded/
uploaded/ocp_sop.txt
uploaded/lost+found/

sent 38 bytes  received 190 bytes  152.00 bytes/sec
total size is 32  speedup is 0.14

$ oc rsync demo-2-fxx6d:/opt/app-root/src/uploaded ./demo-app
receiving incremental file list
uploaded/
uploaded/ocp_sop.txt
uploaded/lost+found/

sent 38 bytes  received 190 bytes  152.00 bytes/sec
total size is 32  speedup is 0.14

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ocp_sop.txt 文件下载到本地系统，以通过备份软件或其他备份机制备份。

注意

如果 pod 启动而无需使用 pvc，但稍后您决定需要 pvc，则可以使用前面的步骤。您可以保留数据，然后使用剩余的进程填充新存储。

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4.8. 备份持久性卷声明

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