Problem and Goal

If you want to check if nfs storage can be used and mounted, then you can use this note to check the status.

Environment

• You have nfs storage:

  $ kubectl -n hub get pods | grep nfs
  
  nfs-project-infuseai-0             1/1     Running     0          8d
  

Step-by-step Method and Verification

Part 1: Mount the nfs storage pods folder to local machine folder

• Install nfs-common

  $ sudo apt-get install nfs-common -y
  

• Get the mount IP address

  $ kubectl -n hub get svc | grep nfs
  
  nfs-project-infuseai              ClusterIP   <nfs-ip-address>    <none>        2049/TCP,20048/TCP,111/TCP   31d
  

• Use mount to check the nfs-storage by first mounting it locally.

  $ mkdir test-mount/
  
  $ sudo mount -t nfs <nfs-ip-address>:/ test-mount/
  
  $ cd test-mount && ls
  

• Check the nfs storage by first mounting it locally.

  $ sudo umount test-mount/
  

Part 2: Mount the nfs storage pods folder to other kubernetes pods folder

• Use mountpvc kubectl extention tool to mount the nfs storage pods folder to other kubernetes pods folder.

  $ kubectl -n hub get pvc | grep nfs-project-infuseai
  data-nfs-project-infuseai-0   Bound  <pv-name>   20Gi   RWO  rook-block   31d
  project-infuseai              Bound  <pv-name>   20Gi   RWX               31d
  
  $ kubectl mountpvc --pvc project-infuseai -n hub test-mount-pvc --image ubuntu:18.04 --command -- sleep 100000 | kubectl apply -f -
  

• Check the folder is in the test-mount-pvc pod.

  • In command line:

    $ kubectl -n hub get pods | grep test-mount-pvc
    test-mount-pvc-<id>         1/1     Running     0          5s
    
    $ kubectl -n hub exec -it test-mount-pvc-<id> -- bash
    

  • In Kubernetes pods:

    root@test-mount-pvc-<id>:/# cd pvcs/project-infuseai/
    root@test-mount-pvc-<id>:/pvcs/project-infuseai/# ls
    

• Delete the deployment to unmount the nfs storage.

  $ kubectl -n hub get deploy | grep test-mount-pvc
  test-mount-pvc                        1/1     1            1           3m45s
  
  $ kubectl -n hub delete deploy test-mount-pvc
  deployment.apps "test-mount-pvc" deleted
  

Reference

N/A