CentOS 7
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Kubernetes : Use Persistent Storage
2015/12/21
 
It's necessary to use external storage if you'd like to use Persistent Data.
 
For exmaple, Create a Pod with mounting external storage which is mapped with a directory for saving data on the Node Pod runs. The environment and Container image on this exmaple are the same with here.
[1] Create a Pod on Admin Node.
[root@dlp ~]#
vi pod-webserver.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: httpd
spec:
  containers:
  - name: httpd
    image: web_server
    ports:
    - containerPort: 80
    volumeMounts:
    # the volume to use (it's the one defined in "volumes" section)
    - name: httpd-storage
      # mount point inside Container
      mountPath: /var/www/html
  volumes:
  # any name you like
  - name: httpd-storage
    hostPath:
      # the directory on Host Node for saving data
      path: /var/docker/disk01
[root@dlp ~]#
kubectl create -f pod-webserver.yaml

pods/httpd
[root@dlp ~]#
kubectl get pods -o wide 

NAME      READY     STATUS    RESTARTS   AGE       NODE
httpd     0/1       Running   0          8s        node01
[root@dlp ~]#
kubectl get pod httpd -o yaml | grep "podIP"

podIP: 172.16.89.7
[2] Move to a Node that Pod is running and make sure to work normally.
[root@node01 ~]#
echo "Persistent Storage" > /var/docker/disk01/index.html

[root@node01 ~]#
curl http://172.16.89.7/

Persistent Storage
 
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