PersistentVolumeClaim in a namespace does not connect to a PersistentVolume - kubernetes

Question

My PersistentVolumeClaim will not use the PersistentVolume I have prepared for it.
I have this PersistentVolume in monitoring-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: monitoring-volume
labels:
usage: monitoring
spec:
capacity:
storage: 50Gi
accessModes:
- ReadWriteOnce
hostPath:
path: /data/k8data/monitoring
After I have done
kubectl apply -f monitoring-pv.yaml
I can check that it exists with kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
monitoring-volume 50Gi RWO Retain Available 5m
My PersistentVolumeClaim in monitoring-pvc.yaml looks like this:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: monitoring-claim
namespace: monitoring
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 50Gi
selector:
matchLabels:
usage: monitoring
When I do kubectl apply -f monitoring-pvc.yaml it gets created.
I can look at my new PersistentVolumeClaim with get pvc -n monitoringand I see
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
monitoring-claim Pending manual 31s
When I look at my PersistentVolume with kubectl get pv I can see that it's still available:
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
monitoring-volume 50Gi RWO Retain Available 16m
I had expected the PersistentVolume to be Boundbut it isn't. When I use a ´PersistentVolumeClaim´ with the same name as this, a new PersistentVolumeClaim is created that is written in /tmp and therefore not very persistent.
When I do the same operations without a namespace for my PersistentVolumeClaim everything seems to work.
I'm on minikube on a Ubuntu 18.04.
What do I need to change to be able to connect the volume with the claim?

Answer 1

When I reviewed my question and compared it to a working solution, I noticed that I had missed storageClassName that was set to manual in an example without a namespace that I was able to use.
My updated PersistentVolumenow looks like this:
apiVersion: v1
kind: PersistentVolume
metadata:
name: monitoring-volume
labels:
usage: monitoring
spec:
storageClassName: manual
capacity:
storage: 50Gi
accessModes:
- ReadWriteOnce
hostPath:
path: /data/k8data/monitoring
The only difference is
storageClassName: manual
My preliminary findings is that this was the silly mistake I had done.

Answer 2

Persistent Volume and Volume Claim should in same namespace. You need to add namespace: monitoring. now you can try this below code
for Persistent Volume
monitoring-pv.yml
apiVersion: v1
kind: PersistentVolume
metadata:
name: monitoring-volume
labels:
usage: monitoring
namespace: monitoring
spec:
capacity:
storage: 50Gi
accessModes:
- ReadWriteOnce
hostPath:
path: /data/k8data/monitoring
for Persistent volume claim
monitoring-pvc.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: monitoring-claim
namespace: monitoring
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 50Gi
selector:
matchLabels:
usage: monitoring