k8s存储 pv pvc ,storageclass

1.  pv  pvc

现在测试 glusterfs  nfs  可读可写， 多个pod绑定到同一个pvc上，可读可写。

2. storageclass  分成两种

(1)  建立pvc， 相当于多个pod绑定在一个pvc上。

pvc的yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: managed-nfs-storage-pvc
  annotations:
    volume.beta.kubernetes.io/storage-class: managed-nfs-storage
spec:
  accessModes:
    - ReadWriteOnce  #必须写ReadWriteOnce,否则报错。
  resources:
    requests:
      storage: 5Gi

deployment文件

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nfs-pvc-test
spec:
  replicas:
  template:
    metadata:
      labels:
        app: nfs-pvc-test
    spec:
      containers:
      - name: nginx
        image: docker.cinyi.com:/nginx:alpine
        ports:
        - containerPort:
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
      volumes:
      - name: www
        persistentVolumeClaim:
          claimName: managed-nfs-storage-pvc

---

apiVersion: v1
kind: Service
metadata:
  name: nfs-pvc-test
  labels:
    app: nfs-pvc-test
spec:
  type: NodePort
  ports:
  - port:
  selector:
    app: nfs-pvc-test

(2) 直接引用 storageclass

相当于每个pod都单独创建pvc，pv

新建statefulset

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: web
spec:
  serviceName: "nginx1"
  replicas:
  volumeClaimTemplates:
  - metadata:
      name: test
      annotations:
        volume.beta.kubernetes.io/storage-class: "managed-nfs-storage" #此处引用classname
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 2Gi
  template:
    metadata:
      labels:
        app: nginx1
    spec:
      containers:
      - name: nginx1
        image: docker.cinyi.com:/senyint/nginx:v.
        volumeMounts:
        - mountPath: "/mnt"
          name: test

当使用ceph 块存储时， 使用storageclass  pvc 时， deployment 副本数写成多个，会报错。