Lesson 8. Theoretical Doubt: Relation between PV and PVC
Hello everyone.
How are you all doing?
I am doing the labs for lesson 8: VOLUMES AND DATA and I have a question. I don't understand how the persistentVolumes are related to the PersistentVolumeClaim.
I mean, if I create a PV:
apiVersion: v1 kind: PersistentVolume metadata: name: pvvol-1 spec: capacity: storage: 1Gi accessModes: - ReadWriteMany persistentVolumeReclaimPolicy: Retain nfs: path: /opt/sfw server: k8scp readOnly: false
I can see that it is not claimed by anyone.
~$ kubectl get pv NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE pvvol-1 1Gi RWX Delete Available 87s
Now if I create a PVC:
apiVersion: v1 kind: PersistentVolumeClaim metadata: name: pvc-one spec: accessModes: - ReadWriteMany resources: requests: storage: 200Mi
Now I can see that the PV is claimed by the PVC pvc-one.
~$ kubectl get pv NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE pvvol-1 1Gi RWX Delete Bound small/pvc-one 2m47s
But I have not specified that the PV pvvol-1 is claimed by pvc-one. So how are they related?
Thank you very much and best regards.
Comments
-
@dgsison A control loop in the master watches for new PVCs, finds a matching PV (if possible). In our case it checks only size to be matched. You also can use key
volumeName
key in your PVC manifest to assign it explicitly. For example:apiVersion: v1 kind: PersistentVolumeClaim metadata: name: pvc-one spec: accessModes: - ReadWriteMany resources: requests: storage: 2000Mi volumeName: pvvol-1
You can find more here: https://kubernetes.io/docs/concepts/storage/persistent-volumes/
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