[K8S] NFS数据卷

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]#

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