K8s：NFS存储+PV+PVC+WEB（实战小案例）

PV_PVC

1、创建pv

注意：PV不用定义名称空间、定义也没用、是全局资源、PV一定要小于后端存储。

apiVersion: v1
kind: PersistentVolume
metadata:
  name: myserver-myapp-static-pv
  namespace: myserver          ###写不写都行、PV是全局资源、不受名称空间限制
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadOnlyMany				####多个节点挂载
  nfs:
    path: /data/k8sdata/myserver/myappdata
    server: 10.0.0.206

查看PV

kubectl   get pv

2、创建PVC

注意：1、不能大于PV定义的存储空间

​ 2、必须定义namespace、和pod在同一个namespace

​ 3、一定要和前面的PV类型相同

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: myserver-myapp-static-pvc
  namespace: myserver			###定义后名称空间、后期pod必须跑在这个namespace
spec:
  volumeName: myserver-myapp-static-pv
  accessModes:
    - ReadOnlyMany				###和pv类型一样
  resources:
    requests:
      storage: 10Gi

查看PVC

[root@k8s-31:/data/pv_pvc]# kubectl  get pvc  -n myserver
[root@k8s-31:/data/pv_pvc]# kubectl   describe pvc -n myserver  myserver-myapp-static-pvc 

错误

一定要和前面的PV类型相同
不然后报错、我前面写的ReadOnlyMany、PVC写ReadWriteOnce、就报下面错误：
Events:
  Type     Reason          Age                From                         Message
  ----     ------          ----               ----                         -------
  Warning  VolumeMismatch  8s (x9 over 2m1s)  persistentvolume-controller  Cannot bind to requested volume "myserver-myapp-static-pv": incompatible accessMode

3、启动web

注意：启动web声明一个卷、使用PVC类型、而不是NFS或者hostPath类型

kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: myserver-myapp
  name: myserver-myapp-deployment-name
  namespace: myserver
spec:
  replicas: 1				###修改副本
  selector:
    matchLabels:
      app: myserver-myapp-frontend
  template:
    metadata:
      labels:
        app: myserver-myapp-frontend
    spec:
      containers:
        - name: myserver-myapp-container
          image: nginx:1.20.0
          #imagePullPolicy: Always
          volumeMounts:
          - mountPath: "/usr/share/nginx/html/statics"
            name: statics-datadir		###选择PVC标签名字挂载
      volumes:
        - name: statics-datadir							###挂载时候匹配标签
          persistentVolumeClaim:
            claimName: myserver-myapp-static-pvc		###PVC名称

---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: myserver-myapp-service
  name: myserver-myapp-service-name
  namespace: myserver
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    targetPort: 80
    nodePort: 30080
  selector:
    app: myserver-myapp-frontend

修改haproxy

listen k8s-pv-pvs
    bind 10.0.0.205:80
    mode tcp
    balance roundrobin
    server 10.0.0.32 10.0.0.32:30080 check inter 3s fall 3 rise 5
    server 10.0.0.33 10.0.0.33:30080 check inter 3s fall 3 rise 5

[root@ubuntu2204 ~]#systemctl restart haproxy.service  ###重启haproxy

查看

[root@k8s-31:/data/pv_pvc]# kubectl get pod -n myserver  -o wide	###查看pod启动节点

上传一份数据

后端NFS或者ceph：
我这里测试做实验、后端存储还是NFS
10.0.0.206
[root@206 myappdata]#pwd
/data/k8sdata/myserver/myappdata/a.txt			###存放一张图片或者文件

访问

10.0.0.205/statics/a.txt