Kubernetes NFS Mount Setup for Persistent Storage

Requirements

Install nfs-common on all kubernetes nodes
```
sudo apt install -y nfs-common
```
Install NFS CSI driver
An NFS share setup from something like TrueNAS, Synology, etc.

Setup persistent volume

Create a yaml file called nfs-pv.yaml with the following:

apiVersion: v1
kind: PersistentVolume
metadata:
name: nfs
spec:
capacity:
    storage: 20Gi
accessModes:
    - ReadWriteMany
storageClassName: nfs
nfs:
    server: 192.168.1.24            # IP of NFS Server
    path: "/mnt/TREPOOL/TRESHARE"   # NFS mount path

Apply file
```
kubectl apply -f nfs-pv.yaml
```

Setup persistent volume claim

Create a yaml file called nfs-pvc.yaml with the following:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nfs
spec:
accessModes:
    - ReadWriteMany
storageClassName: nfs
resources:
    requests:
    storage: 20Gi

Apply file
```
kubectl apply -f nfs-pvc.yaml
```

Test with NGINX web server

Create a yaml file called nfs-web.yaml with the following:

apiVersion: apps/v1
kind: Deployment
metadata:
name: nfs-web
spec:
replicas: 1
selector:
    matchLabels:
    app: nfs-web
template:
    metadata:
    labels:
        app: nfs-web
    spec:
    containers:
    - name: nfs-web
        image: nginx
        ports:
        - name: web
            containerPort: 80
        volumeMounts:
        - name: nfs
            mountPath: /usr/share/nginx/html    # NFS path in pod
    volumes:
    - name: nfs
        persistentVolumeClaim:
        claimName: nfs

Apply file
```
kubectl apply -f nfs-web.yaml
```
Get the name of the pod. eg: nfs-web-7bc97bcf48-5brq6
```
kubectl get pods
```
Exec into the pod to verify nfs is mounted and files are available.
```
kubectl exec -it nfs-web-7bc97bcf48-5brq6 -- /bin/bash
```
cd into NFS path from the deployment and list the directory to verify files.
```
cd /usr/share/nginx/html
```