kubernetes volume claim pending with specific volume name - kubernetes

Question

I'm trying to create a PersistentVolumeClaim giv it a specific volumeName to use.
I use this code:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
namespace: zipkin
name: pvc-ciro
spec:
accessModes:
- ReadWriteOnce
storageClassName: nfs-provisioner
resources:
requests:
storage: 0.1Gi
volumeName: "demo"
If I remove volumeName the PVC is correctly bound otherways remain in pending status.
Why?

Answer 1

The volumeName is a name of the PersistentVolume you want to use.
On GKE PVC can automatically create a PV that will bound to, or you can specify the name of it using volumeName.
pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: pvc-ciro
spec:
accessModes:
- ReadWriteOnce
storageClassName: standard
resources:
requests:
storage: 0.1Gi
volumeName: demo
pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: demo
spec:
capacity:
storage: 5Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: standard
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: /tmp
server: 172.17.0.2
And the output will be:
$ kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
demo 5Gi RWO Recycle Bound default/pvc-ciro standard 13s
$ kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
pvc-ciro Bound demo 5Gi RWO standard 8s
You can read more details in Kubernetes documentation regarding Persistent Volumes.