How to check nfs file system is mounted or not in kubernetes

To check whether the NFS share used by the nfs-subdir-external-provisioner is mounted and in use by your Kubernetes cluster, you can follow these steps:

---

Step-by-Step Check

1. Get the Pod Name of the NFS Provisioner

kubectl get pods -n kube-system -l app=nfs-subdir-external-provisioner

2. Inspect the Logs for Mount Info
kubectl logs <pod-name> -n kube-system
Look for lines like:
Mounting NFS volume...
Or errors like:
Failed to mount NFS volume...
3. Exec into the NFS Provisioner Pod
kubectl exec -it <pod-name> -n kube-system -- sh
Once inside:
mount | grep nfs
or
df -h | grep nfs
You should see something like:
nfs-server:/exported/path on /persistentvolumes type nfs ...
4. Check Mounted Volumes on a Node
If you're using hostPath or troubleshooting at the node level:
ssh <node-name>
mount | grep nfs
To Check Persistent Volume Claims (PVCs) Using the NFS Provisioner:
kubectl get pvc --all-namespaces -o wide
Look at the STORAGECLASS column and check if it matches your NFS storage class.
Example:
The mount path is typically defined in the nfs-subdir-external-provisioner 
deployment YAML under:
yaml
env:
  - name: NFS_SERVER
    value: <your-nfs-server>
  - name: NFS_PATH
    value: /some/path
If the NFS is not mounted correctly, PVCs using this provisioner will be stuck in 
Pending or pods will throw VolumeMount errors.