Kubernetes部分Volume类型介绍及yaml示例--NFS（网络数据卷）

1. 说明
   nfs 卷允许将现有的 NFS（网络文件系统）共享挂载到你的容器中。不像 emptyDir，当删除 Pod 时，nfs 卷的内容被保留，卷仅仅是被卸载。这意味着 NFS 卷可以预填充数据，并且可以在 pod 之间“切换”数据。 NFS 可以被多个写入者同时挂载。
2. 部署NFS服务器
   关于NFS的部署，请参考
3. 实战pod内的文件共享

   #创建yaml文件cat >> nginx_volume.yaml << EOFapiVersion: v1kind: Podmetadata:    name: nginx-test    namespace: test    labels:        app: nginxspec:    containers:    - name: nginx        image: nginx:1.7.9        ports:        - containerPort: 80        volumeMounts:        #Mount the path to the container        - mountPath: "/tmp/"            name: pv0003    volumes:    - name: pv0003        nfs:          #fixed：This ip is the address of the nfs server            server: 192.168.246.169            #fixed：This path is shared externally by the nfs server            path: "/data"

   #启动nginx_volume.yamlkubectl create -f ./nginx_volume.yaml

   #查看Pod运行状态kubectl get po -n testNAME                         READY     STATUS    RESTARTS   AGEnginx-test                   1/1       Running   0          29s

   #进入容器查看共享卷volumekubectl exec -it nginx-test  /bin/bash --namespace=testroot@nginx-test:/# cd tmproot@nginx-test:/tmp# lslost+found  sys##我们可以看到NFS服务器共享卷/data已经挂载进来了

4. 实战多个Pod内的容器间共享

   #创建deploymentcat >> deploy_volume.yaml << EOFapiVersion: extensions/v1beta1kind: Deploymentmetadata:    name: nginx-wtf    namespace: testspec:    replicas: 2    template:        metadata:            labels:                app: wtf        spec:            containers:            - name: nginx-wtf                image: nginx:1.7.9                ports:                - containerPort: 81                volumeMounts:                 - name: pv0003                     mountPath: /tmp/            volumes:            - name: pv0003                nfs:                    server: 192.168.246.169                    path: "/data/"

   #启动deploymentkubectl create -f ./deploy_volume.yaml

   #查看Pods的运行状态NAME                         READY     STATUS    RESTARTS   AGEnginx-wtf-5774b87bdc-n97gr   1/1       Running   0          32mnginx-wtf-5774b87bdc-xpsnr   1/1       Running   0          32m

   #进入容器查看共享卷volumekubectl exec -it nginx-wtf-5774b87bdc-n97gr  /bin/bash --namespace=testroot@nginx-wtf-5774b87bdc-n97gr:/# cd tmproot@nginx-wtf-5774b87bdc-n97gr:/tmp# lslost+found  sys

5. 实战volume的操作

   #查看下当前命名空间运行有挂载NFS卷的Podskubectl get po -n testNAME                         READY     STATUS    RESTARTS   AGEnginx-test                   1/1       Running   0          2mnginx-wtf-5774b87bdc-n97gr   1/1       Running   0          36mnginx-wtf-5774b87bdc-xpsnr   1/1       Running   0          36m##在命名空间test里运行有三个Pods

   #在NFS服务端对共享卷进行操作##创建目录datagrandmkdir /data/datagrand

   #查看各Pod中容器内卷的变化##nginx-testkubectl exec -it nginx-test  /bin/bash --namespace=testroot@nginx-test:/# cd tmproot@nginx-test:/tmp# lsdatagrand  lost+found  sys##nginx-wtf-5774b87bdc-n97grkubectl exec -it nginx-wtf-5774b87bdc-n97gr  /bin/bash --namespace=testroot@nginx-wtf-5774b87bdc-n97gr:/# cd tmproot@nginx-wtf-5774b87bdc-n97gr:/tmp# lsdatagrand  lost+found  sys##nginx-wtf-5774b87bdc-xpsnrkubectl exec -it nginx-wtf-5774b87bdc-xpsnr  /bin/bash --namespace=testroot@nginx-wtf-5774b87bdc-xpsnr:/# cd tmproot@nginx-wtf-5774b87bdc-xpsnr:/tmp# lsdatagrand  lost+found  sys##说明：我们可以看到各Pod中容器内卷已有datagrand