How to remove mounted volumes? PV/PVC won't delete|edit|patch - kubernetes

Question

I am using kubectl apply -f pv.yaml on this basic setup:
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv-demo
spec:
storageClassName: "normal"
capacity:
storage: 1Gi
persistentVolumeReclaimPolicy: Delete
accessModes:
- ReadWriteOnce
hostPath:
path: /home/demo/
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: pvc-demo
spec:
storageClassName: "normal"
resources:
requests:
storage: 200Mi
accessModes:
- ReadWriteOnce
---
apiVersion: v1
kind: Pod
metadata:
name: nginx-demo
labels:
name: nginx-demo
spec:
containers:
- image: nginx
name: nginx
volumeMounts:
- mountPath: /usr/share/nginx/html
name: pv-demo
volumes:
- name: pv-demo
persistentVolumeClaim:
claimName: pvc-demo
Now I wanted to delete everything so I used: kubectl delete -f pv.yaml
However, the volume still persists on the node at /home/demo and has to be removed manually.
So I tried to patch and remove protection before deletion:
kubectl patch pv pv-demo -p '{"metadata":{"finalizers":null}}'
But the mount still persists on the node.
I tried to edit and null Finalizers manually, although it said 'edited'; kubectl get pv shows Finalizers unmodified.
I don't understand what's going on, Why all of the above is not working? I want when delete, the mount folder on the node /home/demo gets deleted as well.

Answer 1

This is expected behavior when using hostPath as it does not support deletion as to other volume types. I tested this with kubeadm and gke clusters and the mounted directory and files remain intact after removal the pv and pvc.
Taken from the manual about reclaim policies:
Currently, only NFS and HostPath support recycling. AWS EBS, GCE PD,
Azure Disk, and Cinder volumes support deletion.
While recycle is mentioned in documentation as deprecated since version 1.5 it still works and can cleanup your files but it won`t delete your mounted directory. It is not ideal but that is the closest workaround.
IMPORTANT:
To successfully use recycle you cannot delete PV itself. If you delete PVC then controller manager creates recycyler pod that cleans up the volumes and this volume become available for binding to the next PVC.
When looking at the control-manager logs you can see that host_path deleter rejects the /home/demo/ dir deletion and it supports only deletion of the /tmp/.+ directory. However after testing this tmp is also not being deleted.
'Warning' reason: 'VolumeFailedDelete' host_path deleter only supports /tmp/.+ but received provided /home/demo/```

Answer 2

May be you can try with hostpath under /tmp/