NFS or Network File System is a great way to share documents, or expand your disk space, using the disk on another server, I am using it to share documents between my office and home, I have my office disk mounted in my home's PC using NFS.
Well the PC at my office has CentOS, so the first thing I need is to install the necessary software.
yum install nfs-utils portmap
If you are using Debian write:
sudo aptitude install nfs-user-server pormap
Ok, now we need to configure it, there are basically two configuration files one in the server side, and one the client side.