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Storage

⬅️ Back to Kubernetes overview

The goal of this exercise is to create a persistent volume (PV) & persistent volume claim (PVC) and use it in a pod.

Let's create a persistent volume claim (PVC).

kubectl apply -f kubernetes/storage/pvc.yaml

💡 Many things happen(ed) behind the scenes.

📝 Can you figure out the StorageClass and the size of the created PVC?

📝 Was a persistent volume (PV) created as well? If yes, what is the name and how can I see it?

Create the YAML necessary for a new deployment using an image of your choice such as ubi-8/httpd-24, chtime/via or nginx. Add the Volume Mount to the container spec:

    volumeMounts:
    - mountPath: /volumes/persistent
      name: persistent-volume

In order to use the volume in a container, you must request it on the pod level as well, i.e. inside the pod spec:

volumes:
- name: persistent-volume
  persistentVolumeClaim:
    claimName: volume-claim

💡 If you need to generate YAML for a pod you can use the parameter --dry-run=client -o yaml.

Create a file that is visible or used in the image you deployed, e.g.

  • ubi-8/httpd-24:/var/www/html/index.html
  • chtime/via: /volumes/persistent/anything (this image lists all files under the VOLUMES_PATH set as environment variable)
  • nginx: /usr/share/nginx/html
kubectl exec -it deployment/storage-app -- sh
echo 'Hello from storage' > /var/www/html/index.html

Start port-forwarding and check the results in your browser.

kubectl port-forward deployment/storage-app 8080:8080

📝 Delete the deployment, observe the pods disappear and create a new one using the same claim volume-claim as you did before. How is the pod behaving?

📝 Delete all resources you have created.