为deployment挂载nfs卷

为deployment挂载nfs卷

nfs卷允许将现有的NFS(网络文件系统)共享装载到Pod中。与删除Pod时会擦除的emptyDir不同，nfs卷的内容会保留下来，而卷只是被卸载。这意味着NFS卷可以预先填充数据，并且数据可以在pod之间共享。NFS可以被多个对象同时挂载。

生成脚本文件

kubectl create deployment nfs-deploy --image=nginx --dry-run=client -n openeuler -o yaml > nfs-deploy.yaml

增加volume配置内容

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: nfs-deploy
  name: nfs-deploy
  namespace: openeuler
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nfs-deploy
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nfs-deploy
    spec:
      volumes:
      - name: v1
        nfs:
          server: 192.168.26.135
          path: /data
      containers:
      - image: nginx
        imagePullPolicy: IfNotPresent
        name: nginx
        resources: {}
        volumeMounts:
        - name: v1
          mountPath: /data
status: {}

kubectl apply -f nfs-deploy.yaml

验证结果

kubectl exec -it -n openeuler  nfs-deploy-5c644945b7-mh429  -- df -h /data
Filesystem            Size  Used Avail Use% Mounted on
192.168.26.135:/data   37G  1.7G   33G   5% /data

注意：pod调度的节点需要安装nfs-utils，不然Pod会一直处于ContainerCreating状态，查看通过命令查看kubectl describe pods -n openeuler nfs-deploy-75d4bcfbd5-b5g9k以下提示：

Events:
  Type     Reason       Age                   From               Message
  ----     ------       ----                  ----               -------
  Normal   Scheduled    3m43s                 default-scheduler  Successfully assigned openeuler/nfs-deploy-75d4bcfbd5-b5g9k to vms129.openeuler.cc
  Warning  FailedMount  2m10s                 kubelet            Unable to attach or mount volumes: unmounted volumes=[v1], unattached volumes=[v1 kube-api-access-qfgpf]: timed out waiting for the condition
  Warning  FailedMount  2m4s (x9 over 4m12s)  kubelet            MountVolume.SetUp failed for volume "v1" : mount failed: exit status 32
Mounting command: mount
Mounting arguments: -t nfs 192.168.26.135:/data /var/lib/kubelet/pods/42efd45e-5675-47c6-a808-4f30268e00f5/volumes/kubernetes.io~nfs/v1
Output: mount: /var/lib/kubelet/pods/42efd45e-5675-47c6-a808-4f30268e00f5/volumes/kubernetes.io~nfs/v1: bad option; for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount.<type> helper program.
       dmesg(1) may have more information after failed mount system call.