NFS使用pv pvc解决主机ip和存储路径暴露问题

迈不过友情╰ 2022-10-18 01:29 106阅读 0赞

使用nfs对pod的数据持久化，进行网络存储时，需要在资源编排文件中暴露nfs主机的ip和存储路径，这样有一定弊端，为了解决这一问题引入了pv pvc。

pv:存储的资源，提供了资源访问的方式；

pvc:对资源访问，也就是访问pvc;

pvc和pv绑定之后，支持匹配模式就可以访问资源了。

pvc 资源编排文件：

[root@k8smaster pv]# cat pvc.yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: nginx-dep1
    spec:
      replicas: 3
      selector:
        matchLabels:
          app: nginx
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: nginx
            volumeMounts:
            - name: wwwroot
              mountPath: /usr/share/nginx/html
            ports:
            - containerPort: 80
          volumes:
          - name: wwwroot
            persistentVolumeClaim:
              claimName: my-pvc
    
    ---
    
    apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      name: my-pvc
    spec:
      accessModes:
        - ReadWriteMany
      resources:
        requests:
          storage: 5Gi

# 启动pvc
    [root@k8smaster pv]# kubectl apply -f pvc.yaml

pv 资源编排文件

[root@k8smaster pv]# cat pv.yaml
    apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: my-pv
    spec:
      capacity:
        storage: 5Gi
      accessModes:
        - ReadWriteMany
      nfs:
        path: /data/nfs
        server: nfs主机ip

启动pv资源

[root@k8smaster pv]# kubectl apply -f pv.yaml

pvc根据匹配模式寻找部署好的pv

# pvc已经绑定了pvc
    [root@k8smaster pv]# kubectl get pv,pvc
    NAME                     CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM            STORAGECLASS   REASON   AGE
    persistentvolume/my-pv   5Gi        RWX            Retain           Bound    default/my-pvc                           2m14s
    
    NAME                           STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
    persistentvolumeclaim/my-pvc   Bound    my-pv    5Gi        RWX                           11m
    [root@k8smaster pv]#

进入容器查看 上一篇博客存放在nfs中的文件是否同步成功

[root@k8smaster pv]# kubectl get pods
    NAME                          READY   STATUS    RESTARTS   AGE
    nginx-dep1-58b7bf955f-bwftk   1/1     Running   0          13m
    nginx-dep1-58b7bf955f-d72vb   1/1     Running   0          13m
    nginx-dep1-58b7bf955f-z9cbg   1/1     Running   0          13m
    [root@k8smaster pv]# kubectl exec -it nginx-dep1-58b7bf955f-z9cbg bash
    kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
    root@nginx-dep1-58b7bf955f-z9cbg:/# cd /usr/
    bin/     games/   include/ lib/     local/   sbin/    share/   src/
    root@nginx-dep1-58b7bf955f-z9cbg:/# cd /usr/local/
    bin/     etc/     games/   include/ lib/     man/     sbin/    share/   src/
    root@nginx-dep1-58b7bf955f-z9cbg:/# cd /usr/share/nginx/html/
    root@nginx-dep1-58b7bf955f-z9cbg:/usr/share/nginx/html# ls
    a.txt  index.html