Build NIS Server in order to share users' accounts in local networks. It's neccessary to install ypserv for NIS.

[root@ns ~]# yum -y install ypserv
 [root@ns ~]# ypdomainname server-linux.info  

# set NIS domain

[root@ns ~]# vi /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=ns.server-linux.info
GATEWAY=192.168.0.1

# add at the bottom of file

NISDOMAIN=server-linux.info

[root@ns ~]# vi /var/yp/Makefile
# MERGE_PASSWD=true|false

# line 42: change

MERGE_PASSWD=false
#
# MERGE_GROUP=true|false

# line 46: change

MERGE_GROUP=false
#

# line 109: add

all: passwd shadow  group hosts rpc services netid protocols
[root@ns ~]# host 127.0.0.1

255.255.255.0 192.168.0.0

# create a directory for web site automatically when a user is added in the system

[root@ns ~]# mkdir /etc/skel/public_html
[root@ns ~]#

# create a directory for email automatically when a user is added in the system

[root@ns ~]# mkdir -p /etc/skel/Maildir/cur 
[root@ns ~]# mkdir -p /etc/skel/Maildir/new
[root@ns ~]#mkdir -p /etc/skel/Maildir/tmp
[root@ns ~]#chmod -R 700 /etc/skel/Maildir/
[root@ns ~]#/etc/rc.d/init.d/portmap start
Starting portmap: [  OK  ]
[root@ns ~]#/etc/rc.d/init.d/ypserv start
Starting YP server services: [  OK  ]
[root@ns ~]#/etc/rc.d/init.d/yppasswdd start
Starting YP passwd service: [  OK  ]
[root@ns ~]#chkconfig portmap on
[root@ns ~]#chkconfig ypserv on
[root@ns ~]#chkconfig yppasswdd on
[root@ns ~]#useradd cent
[root@ns ~]#passwd cent
Changing password for user cent.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root@ns ~]# /usr/lib/yp/ypinit -m

# update NIS database

At this point, we have to construct a list of the hosts which will run NIS servers. ns.server-linux.info is in the list of NIS server hosts. Please continue to add the names for the other hosts, one per line. When you are done with the list, type a <control D>.
next host to add: ns.server-linux.info
next host to add:

# push Ctrl + D keys

The current list of NIS servers looks like this:
ns.server-linux.info
Is this correct? [y/n: y] y

# input 'y' and push Enter key

We need a few minutes to build the databases...
Building /var/yp/server-linux.info/ypservers...
Running /var/yp/Makefile...
gmake[1]: Entering directory `/var/yp/server-linux.info'
Updating passwd.byname...
Updating passwd.byuid...
Updating group.byname...
Updating group.bygid...
Updating hosts.byname...
Updating hosts.byaddr...
Updating rpc.byname...
Updating rpc.bynumber...
Updating services.byname...
Updating services.byservicename...
Updating netid.byname...
Updating protocols.bynumber...
Updating protocols.byname...
Updating mail.aliases...
gmake[1]: Leaving directory `/var/yp/server-linux.info'
ns.server-linux.info has been set up as a NIS master server.
Now you can run ypinit -s ns.server-linux.info on all slave server.

# It's neccessary to update NIS database with following way if new user is added again

[root@ns ~]#cd /var/yp
[root@ns yp]#make