kubernetes — PV和PVC详解

参考：

　　pod: https://www.cnblogs.com/along21/p/10342788.html

　　statefulset: https://blog.csdn.net/An1090239782/article/details/110927486

创建PV：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv001
  labels:
    name: pv001
spec:
  nfs:
    path: /data/volumes/v1
    server: 10.3.65.14
  accessModes: ["ReadWriteMany","ReadWriteOnce"]
  capacity:
    storage: 2Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv002
  labels:
    name: pv002
spec:
  nfs:
    path: /data/volumes/v2
    server: 10.3.65.14
  accessModes: ["ReadWriteOnce"]
  capacity:
    storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv003
  labels:
    name: pv003
spec:
  nfs:
    path: /data/volumes/v3
    server: 10.3.65.14
  accessModes: ["ReadWriteMany","ReadWriteOnce"]
  capacity:
    storage: 20Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv004
  labels:
    name: pv004
spec:
  nfs:
    path: /data/volumes/v4
    server: 10.3.65.14
  accessModes: ["ReadWriteMany","ReadWriteOnce"]
  capacity:
    storage: 10Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv005
  labels:
    name: pv005
spec:
  nfs:
    path: /data/volumes/v5
    server: 10.3.65.14
  accessModes: ["ReadWriteMany","ReadWriteOnce"]
  capacity:
    storage: 15Gi

创建PVC和pod进行绑定

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mypvc
  namespace: default
spec:
  accessModes: ["ReadWriteMany"]
  resources:
    requests:
      storage: 6Gi
---
apiVersion: v1
kind: Pod
metadata:
  name: vol-pvc
  namespace: default
spec:
  volumes:
  - name: html
    persistentVolumeClaim:
      claimName: mypvc
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
    volumeMounts:
    - name: html
      mountPath: /usr/share/nginx/html/

kubectl get pv
kubectl get pvc
kubectl get pod -o wide

 删除pod、pvc、pv

重新做StatefulSet 的

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-nfs1
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: nfs
  nfs:
    path: /data/nfs1
    server: 10.3.65.14
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-nfs2
spec:
  capacity:
    storage: 3Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: nfs
  nfs:
    path: /data/nfs2
    server: 10.3.65.14
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-nfs3
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: slow
  nfs:
    path: /data/nfs3
    server: 10.3.65.14
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-nfs4
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: nfs
  nfs:
    path: /data/nfs4
    server: 10.3.65.14
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-nfs5
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: nfs
  nfs:
    path: /data/nfs5
    server: 10.3.65.14
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-nfs6
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  storageClassName: nfs
  nfs:
    path: /data/nfs6
    server: 10.3.65.14

statefulset

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  selector:
    matchLabels:
      app: nginx # has to match .spec.template.metadata.labels
  serviceName: "nginx"
  replicas: 3 # by default is 1
  template:
    metadata:
      labels:
        app: nginx # has to match .spec.selector.matchLabels
    spec:
      terminationGracePeriodSeconds: 100
      containers:
      - name: nginx
        image: registry.cn-beijing.aliyuncs.com/google_registry/nginx:1.17
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "nfs"
      resources:
        requests:
          storage: 3Gi

结果：

kubectl describe pod/web-1

查看web-1为何不行

nfs对应目录没有建，建好了就OK了

写个文件试试吧

 可以的，有3个，当时一个阻塞了，没看到第三个，测试都OK。