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k8s 数据卷NFS共享卷

2021-12-08 15:01:29 作者：互联网

k8s-数据卷NFS共享卷

1. k8s数据卷NFS共享卷

NFS数据卷：提供对NFS挂载支持，可以自动将NFS共享路径挂载到Pod中
NFS：是一个主流的文件共享服务器。

安装示例：

# yum install nfs-utils -y
# vi /etc/exports
/ifs/kubernetes *(rw,no_root_squash)
# mkdir -p /ifs/kubernetes
# systemctl start nfs
# systemctl enable nfs

注：每个Node上都要安装nfs-utils包

NFS共享卷架构图
示例：将网站程序通过NFS数据卷共享，让所有Pod使用

示例代码：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-nfs
spec:
  selector:
    matchLabels:
      app: nginx-nfs
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx-nfs
    spec:
      containers:
      - name: nginx-nfs
        image: nginx
        volumeMounts:
        - name: wwwroot
          mountPath: /usr/share/nginx/html
        ports:
        - containerPort: 80
      volumes:
      - name: wwwroot
        nfs:
          server: 10.100.24.85
          path: /ifs/kubernetes

2. 案例

2.1 安装和配置nfs

安装nfs

[root@k8s-node1 ~]# yum install nfs-utils -y
[root@k8s-node2 ~]# yum install nfs-utils -y
[root@k8s-node3 ~]# yum install nfs-utils -y

用node3做本次的nfs共享磁盘

修改nfs配置文件

[root@k8s-node3 ~]# vi /etc/exports
[root@k8s-node3 ~]# cat /etc/exports
/ifs/kubernetes *(rw,no_root_squash)

创建nfs共享目录

[root@k8s-node3 ~]# mkdir -p /ifs/kubernetes

创建index.html文件

[root@k8s-node3 ~]# cd /ifs/kubernetes/
[root@k8s-node3 kubernetes]# vim index.html
[root@k8s-node3 kubernetes]# cat index.html
<h1>hello world!</h1>

每个node都启动并设置开机启动

[root@k8s-node3 ~]# systemctl start nfs      #启动nfs
[root@k8s-node3 ~]# systemctl enable nfs     # 设置开机启动
Created symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/system/nfs-server.service.

2.2 挂载nfs盘到pod容器

创建代码目录

[root@k8s-master yaml]# mkdir -p nfs/
[root@k8s-master yaml]# cd nfs/

编写pod代码

[root@k8s-master nfs]# vim nfs.yaml
[root@k8s-master nfs]# cat nfs.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-nfs
spec:
  selector:
    matchLabels:
      app: nginx-nfs
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx-nfs
    spec:
      containers:
      - name: nginx-nfs
        image: nginx
        volumeMounts:
        - name: wwwroot
          mountPath: /usr/share/nginx/html
        ports:
        - containerPort: 80
      volumes:
      - name: wwwroot
        nfs:
          server: 10.100.24.85
          path: /ifs/kubernetes

启动服务

[root@k8s-master nfs]# kubectl apply -f  nfs.yaml
deployment.apps/web-nfs created

检查服务是否启动

[root@k8s-master nfs]# kubectl get pods,service -o wide
NAME                           READY   STATUS    RESTARTS   AGE     IP               NODE        NOMINATED NODE   READINESS GATES
pod/configmap-demo-pod         1/1     Running   0          2d4h    10.244.107.209   k8s-node3   <none>           <none>
pod/my-hostpath                1/1     Running   0          4h45m   10.244.107.211   k8s-node3   <none>           <none>
pod/secret-demo-pod            1/1     Running   0          46h     10.244.107.210   k8s-node3   <none>           <none>
pod/web-nfs-84f8d7bf8d-6mj75   1/1     Running   0          2m42s   10.244.107.212   k8s-node3   <none>           <none>
pod/web-nfs-84f8d7bf8d-n4tpk   1/1     Running   0          2m42s   10.244.169.144   k8s-node2   <none>           <none>
pod/web-nfs-84f8d7bf8d-qvd2z   1/1     Running   0          2m42s   10.244.36.84     k8s-node1   <none>           <none>

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE   SELECTOR
service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   13d   <none>

检查内容是否存在

[root@k8s-master nfs]# curl -I 10.244.107.212
HTTP/1.1 200 OK
Server: nginx/1.19.6
Date: Mon, 28 Dec 2020 12:43:19 GMT
Content-Type: text/html
Content-Length: 22
Last-Modified: Mon, 28 Dec 2020 12:17:10 GMT
Connection: keep-alive
ETag: "5fe9ccc6-16"
Accept-Ranges: bytes

[root@k8s-master nfs]# curl  10.244.107.212
<h1>hello world!</h1>

标签：nginx,nfs,NFS,共享,k8s,root,node3,pod
来源： https://www.cnblogs.com/scajy/p/15661562.html