Mounting a PVC to a Pod
- Docker & Kubernetes course
- Advanced
- Lesson 35/70
- 4 min
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/apiVerifying 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
# merhabaPractice 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.
Starter code
# buraya yazSample solution
spec:
volumes:
- name: veri
persistentVolumeClaim:
claimName: api-veri
containers:
- name: api
image: api:1.0
volumeMounts:
- name: veri
mountPath: /var/lib/apiExpected output
deployment.apps/api configured $ kubectl exec deploy/api -- df -h /var/lib/api Filesystem Size Used Avail Use% Mounted on /dev/sdb 4.9G 24K 4.9G 1% /var/lib/api
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 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 Correct answer
- They are deleted
- They are restored from the image
Explanation: The data is on the PV; the pod only mounts it.
2 Specify which PVC the volume is.
volumes:
- name: veri
persistentVolumeClaim:
____: api-veri volumes:
- name: veri
persistentVolumeClaim:
claimName: api-veriExplanation: claimName is the PVC's name.
3 Match.
| Term | Meaning |
|---|---|
persistentVolumeClaim |
Volume source |
claimName |
PVC name |
mountPath |
Path in the container |
Terminating PVC |
Waiting because it's in use |