基于NFS的PV动态供给(StorageClass)

静态：pod-->pvc-->pv

动态：pod -->pvc-->storageclass

1. Storageclass解决PV手动创建需求

当每次创建 PVC 声明使用存储时，都需要去手动的创建 PV，来满足 PVC 的使用。

可以用一种机制来根据用户声明的存储使用量（PVC）来动态的创建对应的持久化存储卷（PV）。k8s 用 StorageClass 来实现动态创建持久化存储。

2 配置nfs服务器

/nfs1 *(rw,no_root_squash,no_all_squash,sync)
/nfs2 *(rw,no_root_squash,no_all_squash,sync)
/nfs3 *(rw,no_root_squash,no_all_squash,sync)

3 去官网下载三个文件

这三个文件去网上下载 https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client/deploy

使用脚本批量下载：

for file in class.yaml deployment.yaml rbac.yaml; do wget https://raw.githubusercontent.com/kubernetes-incubator/external-storage/master/nfs-client/deploy/$file ; done

其中deployment.yaml需要修改一下挂载的地址和目录

[root@k8s-master01 pv]# cat deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nfs-client-provisioner
  labels:
    app: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: nfs-client-provisioner
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccountName: nfs-client-provisioner
      containers:
        - name: nfs-client-provisioner
          image: quay.io/external_storage/nfs-client-provisioner:latest
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: fuseim.pri/ifs
            - name: NFS_SERVER
              value: 192.168.1.210
            - name: NFS_PATH
              value: /nfs3
      volumes:
        - name: nfs-client-root
          nfs:
            server:  192.168.1.210 #nfs地址
            path: /nfs3 #要挂载的目录

然后分别去应用这三个文件

kubectl create -f rbac.yaml
kubectl create -f class.yaml
kubectl create -f deployment.yaml

然后去查看pod看nfs是否创建成功

4 去创建nginx,并且去动态获取PV

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  type: NodePort
  ports:
  - port: 80
    nodePort: 30012
    name: web
  #clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  selector:
    matchLabels:
      app: nginx
  serviceName: "nginx"
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx
        image: wangyanglinux/myapp:v1 
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html #pod要挂载的目录
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteMany" ]
      storageClassName: "managed-nfs-storage" #要跟下载的class.yaml里面的一致
      resources:
        requests:
          storage: 1Gi

然后去应用一下 kubectl apply -f nginx.yaml