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Code Block

language	yml
title	nfsweb-server-rcpod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: web
spec:
  containers:
  - name: web
    image: nginx
    volumeMounts:
      # name must match the volume name below
    - name: nfs
      mountPath: "/usr/share/nginx/html/"
    ports:
    - name: web
      containerPort: 80
      protocol: TCP
  volumes:
  - name: nfs
    nfs:
      # FIXME: use the right name
      #server: nfs-server.default.kube.local
      server: "10.101.9.169"
      path: "/"
      readOnly: false

Testing it Out

After creating our NFS server and a pod consuming it, we can use kubectl exec to test that our NFS is working as expected:

Code Block

language	bash

# Check the node and name of our web pod
ubuntu@mltf-master:~$ kubectl get pods
NAME               READY     STATUS    RESTARTS   AGE       IP           NODE
nfs-server-wc8h6   1/1       Running   0          21m       10.244.1.4   mltf-storage0
web                1/1       Running   0          11m       10.244.3.2   mltf-storage1


# Exec into the container to test writing to the NFS
ubuntu@mltf-master:~$ kubectl exec -it web -- bash
root@web:/# cat /usr/share/nginx/html/index.html 
Hello from NFS!


# Test writing to a file
root@web:/# vi /usr/share/nginx/html/pod-write
bash: vi: command not found


# No "vi" included in nginx image, so we install it
root@web:/# apt-get update && apt-get install vim
Ign:1 http://cdn-fastly.deb.debian.org/debian stretch InRelease
Get:2 http://security.debian.org/debian-security stretch/updates InRelease [94.3 kB]
    ...    ...    ...    ...    ...    ...    ...    ...    ...
Reading state information... Done
The following additional packages will be installed:
  libgpm2 vim-common vim-runtime xxd
Suggested packages:
  gpm ctags vim-doc vim-scripts
The following NEW packages will be installed:
  libgpm2 vim vim-common vim-runtime xxd
0 upgraded, 5 newly installed, 0 to remove and 2 not upgraded.
Need to get 6766 kB of archives.
After this operation, 31.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://cdn-fastly.deb.debian.org/debian stretch/main amd64 xxd amd64 2:8.0.0197-4+deb9u1 [132 kB]
Get:2 http://cdn-fastly.deb.debian.org/debian stretch/main amd64 vim-common all 2:8.0.0197-4+deb9u1 [159 kB]
    ...    ...    ...    ...    ...    ...    ...    ...    ...
update-alternatives: warning: skip creation of /usr/share/man/ja/man1/editor.1.gz because associated file /usr/share/man/ja/man1/vim.1.gz (of link group editor) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/editor.1.gz because associated file /usr/share/man/man1/vim.1.gz (of link group editor) doesn't exist


# Test writing to a file
root@web:/# vi /usr/share/nginx/html/pod-write
root@web:/# cat /usr/share/nginx/html/pod-write
asdf 1234 Hello, World!
root@web:/# exit
exit


# SSH into "storage0", where our NFS server pod is running
ubuntu@mltf-master:~$ ssh 192.168.0.3
Welcome to Ubuntu 16.04.4 LTS (GNU/Linux 4.4.0-127-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  Get cloud support with Ubuntu Advantage Cloud Guest:
    http://www.ubuntu.com/business/services/cloud

14 packages can be updated.
7 updates are security updates.


Last login: Mon Jun 11 16:28:49 2018 from 192.168.0.6


# Verify that the file created inside of our web pod (running on "storage1") was persisted to the NFS directory on "storage0":
ubuntu@mltf-storage0:~$ cat /data/nfs/pod-write 
asdf 1234 Hello, World!

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Testing it Out