Create a directory to share

mkdir /var/share vi /etc/exports /var/share 192.168.100.100(ro,no_root_squash,sync)

Now to apply changes you can :

exportfs -a

To verify :

exportfs

For the first time , you want to restart the services :

service nfs start service portmap start

Mounting Share on the Client Side

mkdir /mnt/serverdata mount -t nfs serverip:/var/share /mnt/serverdata