This document describes how to configure your CentOS 6.x linux to act as a NFS Server to share any directories on your Network

Install required software

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yum install nfs-utils

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Configure NFS server

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vim /etc/idmapd.conf

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# line 5: uncomment and change to your domain name
Domain = test.org

Configure NFS shares

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vim /etc/exports

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/home 10.0.0.0/24(rw,sync,no_root_squash,no_all_squash)

Note:
/home -> shared directory
10.0.0.0/24 -> range of networks NFS permits accesses
rw -> writable
sync -> synchronize
no_root_squash -> enable root privilege
no_all_squash -> enable users' authority

Start NFS services

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/etc/rc.d/init.d/rpcbind start
/etc/rc.d/init.d/nfslock start
/etc/rc.d/init.d/nfs start

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Set services to start at boot

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chkconfig rpcbind on
chkconfig nfslock on
chkconfig nfs on

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Source: http://www.server-world.info/en/note?os=CentOS_6&p=nfs