kubernetes持久卷ReadWriteOnly(RWO)不适用于nfs [英] kubernetes persistent volume ReadWriteOnly(RWO) does not work for nfs

问题描述

有

根据文档:

ReadWriteOnce – the volume can be mounted as read-write by a single node

我基于nfs创建了一个PV:

I created a PV based on nfs:

apiVersion: v1
kind: PersistentVolume
metadata:
  name: tspv01
spec:
  capacity:
    storage: 15Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: /gpfs/fs01/shared/prod/democluster01/dashdb/gamestop/spv01
    server: 169.55.11.79

此PV的PVC:

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: sclaim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 15Gi

创建PVC之后，将其绑定到PV:

After create the PVC bind to the PV:

root@hydra-cdsdev-dal09-0001:~/testscript# kubectl get pvc
NAME      STATUS    VOLUME    CAPACITY   ACCESSMODES   AGE
sclaim    Bound     tspv01    15Gi       RWO           4m

然后我使用相同的PVC创建了2个POD:

Then I created 2 PODs using the same PVC:

POD1:

kind: Pod
apiVersion: v1
metadata:
  name: mypodshared1
  labels:
    name: frontendhttp
spec:
  containers:
    - name: myfrontend
      image: nginx
      ports:
        - containerPort: 80
          name: "http-server"
      volumeMounts:
      - mountPath: "/usr/share/nginx/html"
        name: mypd
  volumes:
    - name: mypd
      persistentVolumeClaim:
       claimName: sclaim

POD2:

kind: Pod
apiVersion: v1
metadata:
  name: mypodshared2
  labels:
    name: frontendhttp
spec:
  containers:
    - name: myfrontend
      image: nginx
      ports:
        - containerPort: 80
          name: "http-server"
      volumeMounts:
      - mountPath: "/usr/share/nginx/html"
        name: mypd
  volumes:
    - name: mypd
      persistentVolumeClaim:
       claimName: sclaim

创建2个POD之后，将它们分配给2个不同的节点.而且我可以执行到容器中，并且可以在nfs挂载的文件夹中进行读写.

After I create the 2 PODs, they are assigned to 2 different nodes. And I can exec into the container, and can read&write in the nfs mounted folder.

root@hydra-cdsdev-dal09-0001:~/testscript# kubectl get pod -o wide
NAME                        READY     STATUS              RESTARTS   AGE       IP            NODE
mypodshared1                1/1       Running             0          18s       172.17.52.7   169.45.189.108
mypodshared2                1/1       Running             0          36s       172.17.83.9   169.45.189.116

有人知道为什么会这样吗?

Anybody know why this happened?

推荐答案

accessModes取决于存储提供程序.对于NFS，它们实际上并没有做任何不同，但是HostPath应该正确使用模式.

The accessModes are dependent upon the storage provider. For NFS they don't really do anything different, but a HostPath should use the modes correctly.

有关所有各种选项，请参见下表: http: //kubernetes.io/docs/user-guide/persistent-volumes/#access-modes

See the following table for all the various options: http://kubernetes.io/docs/user-guide/persistent-volumes/#access-modes

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