原创|NO.A.0007|专题|——|云计算|K8S|持久存储-nfs网络存储|持久存储-PV/PVC|

#1、找一台新的服务器作为nfs服务器，
[root@k8s-nfs ~]#  yum install -y nfs-utils
#设置挂载的目录
[root@k8s-node2 ~]# vim /etc/exports
/data/nfs *(rw,no_root_squash)
[root@k8s-node2 ~]# mkdir -p /data/nfs                     #挂载的路径必须手动创建，若是不创建，后期挂载时挂载不成功的
#2、在k8snode节点上安装上nfs服务
#两个k8s-node节点上都需要部署nfs服务，执行第一步操作
[root@k8s-node1 ~]# yum install -y nfs-utils               #安装上之后，它会自动帮你挂载
[root@k8s-node2 ~]# yum install -y nfs-utils 
#3、在nfs服务端启动nfs
[root@k8s-nfs ~]# systemctl restart rpcbind 
[root@k8s-nfs ~]# systemctl start nfs  
#4、在k8s集群部署应用使用nfs持久网络存储
[root@k8s-master ~]# mkdir pv
[root@k8s-master ~]# cd pv
[root@k8s-master pv]# vim nfs-nginx.yaml
apiVersion: apps/v1
kind: Deployment                                          #部署一个deployment
metadata:
  name: nginx-dep1
spec:
  replicas: 1                                             #副本只有一个
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        volumeMounts:                                    #通过volumeMounts挂载镜像
        - name: wwwroot
          mountPath: /usr/share/nginx/html               #挂载路径
        ports:
        - containerPort: 80
      volumes:
        - name: wwwroot
          nfs:
            server: 10.10.10.14                          #nfs服务器地址
            path: /data/nfs
[root@k8s-master pv]# kubectl apply -f nfs-nginx.yaml 
deployment.apps/nginx-dep1 created
[root@k8s-master pv]# 
[root@k8s-master pv]# kubectl get pods
nginx-dep1-64f6dc84c9-7jcpm                     1/1     Running     0          8s 
#查看它的创建日志
[root@k8s-master pv]# kubectl describe pod nginx-dep1-64f6dc84c9-7jcpm
Events:
  Type    Reason     Age   From                Message
  ----    ------     ----  ----                -------
  Normal  Scheduled  62s   default-scheduler   Successfully assigned default/nginx-dep1-64f6dc84c9-7jcpm to k8s-node2
  Normal  Pulling    57s   kubelet, k8s-node2  Pulling image "nginx"
  Normal  Pulled     57s   kubelet, k8s-node2  Successfully pulled image "nginx"
  Normal  Created    56s   kubelet, k8s-node2  Created container nginx
  Normal  Started    56s   kubelet, k8s-node2  Started container nginx
//进入应用
[root@k8s-master pv]# kubectl exec -it nginx-dep1-64f6dc84c9-7jcpm  bash
root@nginx-dep1-64f6dc84c9-7jcpm:/# ls /usr/share/nginx/html/      #挂载目录下目前为空
//在nfs服务端创建文件
[root@k8s-nfs ~]# vim /data/nfs/index.html
hello k8s-nfs server
//进入k8s部署的持久应用服务查看挂载目录，可以查看到在k8s-nfs下创建的文件
root@nginx-dep1-64f6dc84c9-7jcpm:/# ls /usr/share/nginx/html/
index.html  
root@nginx-dep1-64f6dc84c9-7jcpm:/# cat /usr/share/nginx/html/index.html 
hello k8s-nfs server
//对外暴露端口
[root@k8s-master pv]# kubectl expose deployment nginx-dep1 --port=80 --target-port=80 --type=NodePort
service/nginx-dep1 exposed
[root@k8s-master pv]# kubectl get svc
nginx-dep1       NodePort    10.99.50.53     <none>        80:30769/TCP   4s
//通过Chrome访问持久化地址+端口号访问网页页面：http://10.10.10.14:30769/
service/nginx-dep1 exposed                              #访问到该内容

#1、删除历史创建
[root@k8s-master pv]# kubectl delete -f nfs-nginx.yaml 
deployment.apps "nginx-dep1" deleted
#2、创建一个pvc和pv
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
[root@k8s-master pv]# kubectl apply -f pvc.yaml          #执行pvc
deployment.apps/nginx-dep1 created
persistentvolumeclaim/my-pvc created
[root@k8s-master pv]# kubectl get pods
nginx-dep1-58b7bf955f-n2jn7                     0/1     Running     0          34s
nginx-dep1-58b7bf955f-s4v79                     0/1     Running     0          37s
nginx-dep1-58b7bf955f-tlprc                     0/1     Running     0          34s
[root@k8s-master pv]# kubectl apply -f pv.yaml 
pdeployment.apps/nginx-dep1 created
persistentvolumeclaim/my-pvc created
[root@k8s-master pv]# kubectl get pv,pvc               #pv里面绑定了PVC
NAME                     CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM            STORAGECLASS   REASON   AGE
persistentvolume/my-pv   5Gi        RWX            Retain           Bound    default/my-pvc                           44s


NAME                           STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
persistentvolumeclaim/my-pvc   Bound    my-pv    5Gi        RWX                           2m7s
#3、进入到服务查看
[root@k8s-master pv]# kubectl exec -it nginx-dep1-58b7bf955f-n2jn7 bash
root@nginx-dep1-58b7bf955f-n2jn7:/# ls /usr/share/nginx/html
index.html