NFS (Network File System) enables file and directory sharing across a network. Here's the guide to set it up.

• Server: Ubuntu 22.04 LTS.
• Client: Linux system (Ubuntu preferred).
• Permissions: Root or `sudo` access.

Update and install:

 sudo apt update
 sudo apt install nfs-kernel-server 

Create the directory:

 sudo mkdir -p /srv/nfs/share

Set ownership and permissions:

 sudo chown nobody:nogroup /srv/nfs/share
 sudo chmod 777 /srv/nfs/share

Add the following to `/etc/exports` (replace `<client_ip>`):

 /srv/nfs/share <client_ip>(rw,sync,no_subtree_check)

Export the changes:

 sudo exportfs -a

Enable and start the service:

 sudo systemctl enable nfs-kernel-server
 sudo systemctl start nfs-kernel-server

Allow NFS traffic:

 sudo ufw allow from <client_ip> to any port nfs

Enable UFW and check the status:

 sudo ufw enable
 sudo ufw status
  

The client in this case is the server where Kubernetes is installed and running.

Update and install:

 sudo apt update
 sudo apt install nfs-common

Create the directory:

 sudo mkdir -p /mnt/nfs_clientshare
  

Mount the shared directory (replace `<nfs_server_ip>`):

 sudo mount <nfs_server_ip>:/srv/nfs/share /mnt/nfs_clientshare

Check mounted filesystems:

 df -h | grep nfs_clientshare

List files in the mounted directory:

 ls /mnt/nfs_clientshare

Your NFS server and client setup is complete, enabling efficient file sharing over the network. Ensure regular updates and security checks for optimal performance.