网络存储卷：NFS

演示：

安装nfs服务

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[root@pool1 k8s_yaml]# yum -y install nfs-utils
[root@pool1 k8s_yaml]# vi /etc/exports
/data/k8s_data *(rw,no_root_squash)
[root@pool1 k8s_yaml]# mkdir /data/k8s_data
[root@pool1 k8s_yaml]# systemctl start nfs
[root@pool1 k8s_yaml]# systemctl enable nfs
Created symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/
# 注：每个Node上都要部署nfs服务；

# 测试Node客户端挂载服务端目录
[root@pool2 ~]# mount -t nfs 172.16.1.20:/data/k8s_data /mnt
……
[root@pool2 ~]# df -hT | grep mnt
172.16.1.20:/data/k8s_data nfs4       50G  3.1G   47G   7% /mnt
[root@pool2 ~]# umount /mnt

部署deployment

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[root@pool1 k8s_yaml]# vi deployment-nfs.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nfs-volume
          mountPath: /usr/share/nginx/html
      volumes:
      - name: nfs-volume
        nfs:
          server: 172.16.1.20
          path: /data/k8s_data
          
[root@pool1 k8s_yaml]# kubectl apply -f deployment-nfs.yaml 
deployment.apps/nginx-deployment created
[root@pool1 k8s_yaml]# kubectl get pods
NAME                              READY   STATUS    RESTARTS   AGE
hostpath-pod                      1/1     Running   0          27m
nginx-deployment-7454fb7b-bhcpn   1/1     Running   0          106s
nginx-deployment-7454fb7b-phhkk   1/1     Running   0          106s
nginx-deployment-7454fb7b-q9qh8   1/1     Running   0          106s
[root@pool1 k8s_yaml]# cat >> /data/k8s_data/index.html << EOF
my is nfs volume!
EOF
[root@pool1 k8s_yaml]# kubectl expose deployment nginx-deployment --port=80 --target-port=80
service/nginx-deployment exposed
[root@pool1 k8s_yaml]# kubectl get ep
NAME               ENDPOINTS                                            AGE
kubernetes         172.16.1.20:6443                                     5h44m
nginx-deployment   10.244.206.17:80,10.244.52.197:80,10.244.52.198:80   3s
[root@pool1 k8s_yaml]# kubectl get svc
NAME               TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
kubernetes         ClusterIP   10.96.0.1       <none>        443/TCP   5h44m
nginx-deployment   ClusterIP   10.108.89.236   <none>        80/TCP    12s
[root@pool1 k8s_yaml]# curl 10.108.89.236
my is nfs volume!