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23 Mar 2020
通过nfs方式创建pv/pvc

搭建nfs server

在/etc/exports中添加一下内容：

/root/share 10.0.0.0/8(rw,sync,no_wdelay,no_root_squash,insecure,fsid=0)

参数具体解释如下：

  • 10.0.0.0/8：可以访问的主机ip段
  • rw：可读写
  • sync：将数据同步写入内存和磁盘
  • no_wdelay：若执行写操作，立即执行，须和sync一起使用
  • no_root_squash：如果进入该目录的用户时root，就具备root权限
  • insecure：允许客户端从大于1024的tcp/ip端口连接nfs server
  • fsid=0：nfs文件系统的uuid，为0时只能共享一个目录

重启nfs相关服务：

$ systemctl restart rpcbind.service
$ systemctl restart nfs.service

确认设置生效：

$ exportfs
/root/share     10.0.0.0/8
$ showmount -e
Export list for ssli-ocp1-inf.fyre.ibm.com:
/root/share    10.0.0.0/8

创建相应的pv和pvc

pv.yaml如下：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: share
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Recycle
  volumeMode: Filesystem
  nfs:
    server: 10.16.60.168
    path: "/root/share"

pvc.yaml如下：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: share
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

创建pv和pvc：

$ oc apply -f pv.yaml
persistentvolume/share created
$ oc apply -f pvc.yaml
persistentvolumeclaim/share created
$ oc get pv share
NAME    CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM           STORAGECLASS   REASON   AGE
share   1Gi        RWX            Recycle          Bound    default/share                           9s
$ oc get pvc share
NAME    STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
share   Bound    share    1Gi        RWX                           11s

创建pod使用该pvc

pod.yaml如下：

apiVersion: v1
kind: Pod
metadata:
  name: busybox
spec:
  containers:
  - name: busybox
    image: busybox
    command:
      - sleep
      - "3600"
    volumeMounts:
        - name: share
          mountPath: "/share"
  volumes:
  - name: share
    persistentVolumeClaim:
      claimName: share

创建pod并进入pvc的share目录创建test文件：

$ oc apply -f pod.yaml
pod/busybox created
$ oc exec -it busybox /bin/sh
/ # cd share/
/share # touch test
/share # exit

删除pod后，再次使用该pvc，可以看到test文件依然存在：

$ oc delete -f pod.yaml
pod "busybox" deleted
$ oc apply -f pod.yaml
pod/busybox created
$ oc exec -it busybox /bin/sh
/ # ls /share/
test
/ # exit


LEo at 12:12

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