Mounting a PVC to a Pod

Learn to mount a PVC as a volume in a Pod.

Mounting a PVC in a pod

A pod defines a PVC as a volume under volumes with persistentVolumeClaim.claimName and mounts it in the container with volumeMounts. When the pod is deleted and recreated, it attaches to the same PVC, and therefore the same data:

    spec:
      volumes:
        - name: veri
          persistentVolumeClaim:
            claimName: api-veri
      containers:
        - name: api
          image: api:1.0
          volumeMounts:
            - name: veri
              mountPath: /var/lib/api

Verifying persistence

Persistence is tested by writing data and deleting the pod. Before a PVC is deleted, the pods using it must be deleted; otherwise the PVC stays Terminating (protection):

kubectl exec deploy/api -- sh -c 'echo merhaba > /var/lib/api/not.txt'
kubectl delete pod -l app=api
kubectl exec deploy/api -- cat /var/lib/api/not.txt
# merhaba

Exercise Mount the PVC

Write a pod template's spec section (starting with spec:): a veri volume using the api-veri PVC under volumes; container named api, image api:1.0; mount veri at /var/lib/api.

Show example solution

spec:
  volumes:
    - name: veri
      persistentVolumeClaim:
        claimName: api-veri
  containers:
    - name: api
      image: api:1.0
      volumeMounts:
        - name: veri
          mountPath: /var/lib/api

Test yourself

When you delete the pod and recreate it with the same PVC, what happens to the files in /var/lib/api?
- They move to another pod
- They stay in place
- They are deleted
- They are restored from the image
Show answer

They stay in place — The data is on the PV; the pod only mounts it.

Specify which PVC the volume is.

      volumes:
        - name: veri
          persistentVolumeClaim:
            ____: api-veri

Show answer

      volumes:
        - name: veri
          persistentVolumeClaim:
            claimName: api-veri

Match.

persistentVolumeClaim

Volume source
claimName

PVC name
mountPath

Path in the container
Terminating PVC

Waiting because it's in use

Next lesson: Summary - PV and PVC

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies