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Manage-storage-for-application-configuration-and-data-SOLUTION.md

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Manage storage for application configuration and data

  • Create a project called storage-test

  • Create new app called storage-test-app

$ oc new-app --name storage-test-app --image quay.io/redhattraining/hello-world-nginx

  • Check available storage classes in cluster
$ oc get storageclasses
NAME                    PROVISIONER                                   RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
lvms-vg1                topolvm.io                                    Delete          WaitForFirstConsumer   ...
nfs-storage (default)   k8s-sigs.io/nfs-subdir-external-provisioner   Delete          Immediate   ...

  • We will be using nfs-storage

  • It is easiet to do this with the GUI, otherwise you need to create a yaml file from scratch Storage->PersistentVolumeClaims screenshot

Create PersistenVolumeClaim screenshot

Fill out form with the following info

PersistentVolumeClaim name: storage-test-pvc
Access mode: Single user (RWO)
Size: 1Gi
Volume mode: Filesystem

yaml looks like this

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: storage-test-pvc
  namespace: storage-test
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: nfs-storage
  volumeMode: Filesystem
  • add PVC to storage-test-app deployment (Using GUI)

From the deployment:
Actions->Add storage

(0)Use existing claim: storage-test-pvc

Mount path: /mnt/storage-test

[Save]

App will redeploy

  • log into pod and test storage
$ oc rsh storage-test-app-54bdc95c84-tq4zx /bin/bash
bash-4.4$ ls /mnt
storage-test

$ echo "hello">/mnt/storage-test/hello.txt

$ cat /mnt/storage-test/hello.txt 
hello
  • delete pod, and log into the new pod to make sure the hello.txt file still exists
$ oc delete pod storage-test-app-54bdc95c84-tq4zx 
pod "storage-test-app-54bdc95c84-tq4zx" deleted

$ oc get pods
NAME                                READY   STATUS    RESTARTS   AGE
storage-test-app-54bdc95c84-sllnm   1/1     Running   0          12s

$ oc rsh storage-test-app-54bdc95c84-sllnm cat /mnt/storage-test/hello.txt
hello

...

The above is very simple, but if only given a storageclass and nothing else, and dynamically provisioned PVs isn't available in your environment, look at information around it's FQDN/IP and mount point, and create a static pv with that information first, and get the PVC to point to it. Make sure your PVC spec includes the storageClassName tag.

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