[K8S] NFS数据卷

待我称王封你为后i 2022-09-09 02:14 165阅读 0赞

所有节点安装nfs-utils -> yum install nfs-utils

找一台VM当作NFS服务器, 姑且将k8s-node2(192.168.231.123)作为NFS服务器

1) /etc/exports内容配置如下,路径/nfstest代表会将NFS服务器的这个路径挂载到NFS客户端

[root@k8s-node2 ~]# cat /etc/exports
    /nfstest *(rw,no_root_squash)
    [root@k8s-node2 ~]#

2) 在NFS服务器创建该路径 mkdir /nfstest  
3) 重启NFS服务使配置生效 systemctl start nfs

编辑Deployment的yaml文件,将NFS服务器的/nfstest挂载到Pod路径 /usr/share/nginx/html

[root@k8s-master ~]# cat test-nfs.yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: web-testnfs
    spec:
      selector:
        matchLabels:
          app: nginx
      replicas: 3
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: nginx
            volumeMounts:
            - name: test-nfs
              mountPath: /usr/share/nginx/html
          volumes:
          - name: test-nfs
            nfs:
              server: 192.168.231.123
              path: /nfstest
    [root@k8s-master ~]#

创建Deployment后可以看到一个Pod调度到了k8s-node1,两个Pod调度到了k8s-node2

[root@k8s-master ~]# kubectl apply -f test-nfs.yaml
    deployment.apps/web-testnfs created
    [root@k8s-master ~]#
    [root@k8s-master ~]# kubectl get pod -o wide
    NAME                           READY   STATUS    RESTARTS   AGE     IP               NODE        
    web-testnfs-5d9998b54c-79nqk   1/1     Running   0          35s     10.244.36.124    k8s-node1   <none>           <none>
    web-testnfs-5d9998b54c-bksnd   1/1     Running   0          35s     10.244.169.141   k8s-node2   <none>           <none>
    web-testnfs-5d9998b54c-mnxfh   1/1     Running   0          35s     10.244.169.189   k8s-node2   <none>           <none>
    [root@k8s-master ~]#

进入第一个Pod的容器,到路径/usr/share/nginx/html/下touch一个文件

[root@k8s-master ~]# kubectl exec -it web-testnfs-5d9998b54c-79nqk -- bash
    root@web-testnfs-5d9998b54c-79nqk:/# cd /usr/share/nginx/html/
    root@web-testnfs-5d9998b54c-79nqk:/usr/share/nginx/html# ls
    root@web-testnfs-5d9998b54c-79nqk:/usr/share/nginx/html# touch web-testnfs-replica1Came
    root@web-testnfs-5d9998b54c-79nqk:/usr/share/nginx/html# eixt

进入第二个Pod的容器,在路径/usr/share/nginx/html/下可以看到刚才创建的文件,同时再touch一个文件

[root@k8s-master ~]# kubectl exec -it web-testnfs-5d9998b54c-bksnd -- bash
    root@web-testnfs-5d9998b54c-bksnd:/# cd /usr/share/nginx/html
    root@web-testnfs-5d9998b54c-bksnd:/usr/share/nginx/html# ls
    web-testnfs-replica1Came
    root@web-testnfs-5d9998b54c-bksnd:/usr/share/nginx/html# touch web-testnfs-replica2Came
    root@web-testnfs-5d9998b54c-bksnd:/usr/share/nginx/html#

在NFS服务器的路径/nfstest 也可以看到刚才创建的两个文件

[root@k8s-node2 ~]# cd /nfstest/
    [root@k8s-node2 nfstest]# ls -l
    total 0
    -rw-r--r-- 1 root root 0 Aug 28 14:27 web-testnfs-replica1Came
    -rw-r--r-- 1 root root 0 Aug 28 14:28 web-testnfs-replica2Came
    [root@k8s-node2 nfstest]#