DNS(Domain Name Server) Configuration

Step 1 : Get the IP Address of the machine
[root#] ifconfig
o/p --> 
192.168.2.107


STEP 2: Open the file /etc/sysconfig/network-scripts/ifcfg-eth0

Add one line before IPADDR
DNS1 = 192.168.2.107

the file looks like :
DEVICE="eth0"
DNS1=192.168.2.107
IPADDR=192.168.2.107
BOOTPROTO="dhcp"
HWADDR="00:0C:29:40:CD:04"
MTU="1500"
NM_CONTROLLED="yes"
ONBOOT="yes"

** Save the file	


STEP 3 : Open the file /etc/hosts
Add the last line

server	server.tyit.com	

STEP 4 : Open the file /etc/sysconfig/network
Enter the hostname

HOSTNAME = server.tyit.com

After change :
NETWORKING=yes
HOSTNAME=server.tyit.com
NTPSERVERARGS=iburst

** Save the file


STEP 5 : Open  /etc/resolv.conf
we have to add namesever IP

After chnage file looks like :

# Generated by NetworkManager
#domain localdomain
search  tyit.com
nameserver 192.168.2.107(Your IP)
nameserver 192.168.1.98


Step 6 : Install the bind package
[root#] yum install bind*

Step 7 :  Verify the bind packages
[root#] rpmquery -qa | grep bind
samba-winbind-3.5.4-68.el6.i686
bind-dyndb-ldap-0.1.0-0.9.b.el6.i686
bind-libs-9.7.0-5.P2.el6.i686
bind-utils-9.7.0-5.P2.el6.i686
bind-chroot-9.7.0-5.P2.el6.i686
PackageKit-device-rebind-0.5.8-13.el6.i686
samba-winbind-clients-3.5.4-68.el6.i686
rpcbind-0.2.0-8.el6.i686
bind-9.7.0-5.P2.el6.i686

Step 8 : Open the file /etc/named.conf

Change the IP address in option section :
options {
	listen-on port 53 { any; };

also check at the end of file :
include "/etc/named.rfc1912.zones";

** Save the file

Step 9 : Open the file /etc/named.rfc1912.zones

** Chamges(first zone)
zone "tyit.com" IN {
	type master;
	file "named.localhost";
	allow-update { none; };
};

** Comment Rest Zones

zone "0.in-addr.arpa" IN {
	type master;
	file "named.empty";
	allow-update { none; };
};




Step 10 : Open the file /var/named/named.localhost

** Perform required changes

$TTL 1D
@  IN  SOA    tyit.com.    root(
					0	; serial
					1D	; refresh
					1H	; retry
					1W	; expire
					3H )	; minimum
@      NS      server.tyit.com.
server   A       192.168.2.107

** Save the file

Step 11 :  Start the named service
[root#] service named start

Step 12 : ReStart the named service
[root#] service named restart

Testing DNS

[root#] host server.tyit.com
server.tyit.com has IP Address 192.168.2.107

[root#] dig server.tyit.com