Summary - PV and PVC

Combine PV, PVC and mount to set up persistent storage.

Summary: PV and PVC

In this group:

A PV is a piece of storage in the cluster; it lives independently of pods. Retain keeps the data, Delete deletes the disk.
A PVC is a storage request; it is bound to a suitable PV (Bound).
A StorageClass creates PVs dynamically: provisioner, parameters, allowVolumeExpansion, WaitForFirstConsumer.
Access modes: RWO, ROX, RWX, RWOP; an RWO disk attaches to a single node (Multi-Attach error).
A pod mounts a PVC with persistentVolumeClaim.claimName; the data stays when the pod is deleted.

kubectl get sc,pv,pvc
kubectl describe pvc api-veri

Exercise Grow the storage

Write three commands: list the StorageClasses, PVs and PVCs in one command; grow the api-veri PVC with the patch {"spec":{"resources":{"requests":{"storage":"10Gi"}}}}; show api-veri in detail.

Show example solution

kubectl get sc,pv,pvc
kubectl patch pvc api-veri -p '{"spec":{"resources":{"requests":{"storage":"10Gi"}}}}'
kubectl describe pvc api-veri

Test yourself

A PVC stays Pending and the event says "storageclass not found". What is the fix?
- Correcting storageClassName to an existing class or creating that class
- Restarting the pod
- Shrinking the size
- Changing the namespace
Show answer

Correcting storageClassName to an existing class or creating that class — kubectl get storageclass lists the existing classes.
List the StorageClasses, PVs and PVCs together.
```
kubectl get ____,pv,pvc
```
Show answer
```
kubectl get sc,pv,pvc
```
Match.

PV

Storage
PVC

Request
StorageClass

Automatic creation
claimName

Pod link

Next lesson: What is an HPA?

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