'does kubernetes pv recognize namespace when created/queried with kubectl?

I am using GKE with kubectl installed from gcloud components. I have created a pv (gcePersistentDisk) with namespace scope using kubectl.

apiVersion: v1
kind: PersistentVolume
metadata:
  name: cstor-cs-a-disk-david
  namespace: ns-david
spec:
  gcePersistentDisk:
    pdName: cstor-cs-a-disk-david
    fsType: ext4
    partition: 0
    readOnly: false
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  capacity:
    storage: 200Gi

This says that specifying namespace with create pv is/was valid:
http://kubernetes.io/third_party/swagger-ui/#!/api%2Fv1/createNamespacedPersistentVolume

When I run 'kubectl get pv' I see the pv.

$ kubectl get pv
NAME                    LABELS    CAPACITY       ACCESSMODES   STATUS      CLAIM     REASON
cstor-cs-a-disk-david   <none>    214748364800   RWO           Available

I did not expect this because the pv wasn't created with the default namespace scope.

The same happens if I specify a namespace argument (valid or not).

$ kubectl get namespaces
NAME          LABELS    STATUS
default       <none>    Active
kube-system   <none>    Active
ns-david      <none>    Active

$ kubectl get pv --namespace=demo
NAME                    LABELS    CAPACITY       ACCESSMODES   STATUS      CLAIM     REASON
cstor-cs-a-disk-david   <none>    214748364800   RWO           Available

If I create a claim against this pv and query it with 'kubectl get pvc' then the claim is not found but is found when I specify the correct namespace.

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: cstor-cs-a-disk-claim-david
  namespace: ns-david
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 200Gi
  volumeName: cstor-cs-a-disk-david

$ kubectl get pvc
NAME      LABELS    STATUS    VOLUME

$ kubectl get pvc --namespace=ns-david
NAME                          LABELS    STATUS    VOLUME
cstor-cs-a-disk-claim-david   map[]     Bound     cstor-cs-a-disk-david

Do pv have namespace scope or are they global?

kubernetes


Solution 1:[1]

pv and namespaces belong to Cluster, so they are not NameSpaced. pvc is NameSpaced

Solution 2:[2]

Above solution has link to kube docs to see the list. but providing commands here directly (in case to check quickly instead of going through doc)

To see which Kubernetes resources are and aren't in a namespace:

# In a namespace
kubectl api-resources --namespaced=true

# Not in a namespace
kubectl api-resources --namespaced=false

Thank You!

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 eastonsuo
Solution 2 Venkatesha K

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