====== Step-by-Step Guide to Setting Up NFS Server and Client======

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

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

===== Setting Up the NFS Server =====

==== 1. Install NFS Kernel Server ====
Update and install:
   sudo apt update
   sudo apt install nfs-kernel-server 

==== 2. Create and Configure the Export Directory ====
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

==== 3. Edit NFS Exports ====
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

==== 4. Start NFS Service ====
Enable and start the service:
   sudo systemctl enable nfs-kernel-server
   sudo systemctl start nfs-kernel-server

==== 5. Configure Firewall ====
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
    
===== Setting Up the NFS Client =====

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

==== 1. Install NFS Common Package ====
Update and install:
   sudo apt update
   sudo apt install nfs-common

==== 2. Create a Mount Point ====
Create the directory:
   sudo mkdir -p /mnt/nfs_clientshare
    

==== 3. Mount the NFS Share ====
Mount the shared directory (replace `<nfs_server_ip>`):
   sudo mount <nfs_server_ip>:/srv/nfs/share /mnt/nfs_clientshare

==== 4. Verify Mount ====
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.