DNS (in RHEL 6):

DNS (Introduction):

Used to resolve (translate) domain name to IP address and IP address to domain name.
Port no. 53

Daemon : named
Port no. 53

Packages : bind*

Related Helps:

yum

In this scenario:
IP address of server = 192.168.1.111
Hostname = srv
Domain Name = wtuto.com

Full Computer name (FQDN) = srv.wtuto.com

Install the required packages:

# yum install bind*

Add entry of IP Address, Full Computer Name & Hostname in hosts file:

# vim /etc/hosts
192.168.1.111 srv.wtuto.com srv

Add entry of domain name to search and IP address of DNS Server:

# vim /etc/resolv.conf
search wtuto.com
nameserver 192.168.1.111

Make sure you have an entry of full computer name in network file:

# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=srv.wtuto.com

If you have iptables enabled, allow UDP and TCP traffic for port no. 53:

# vim /etc/sysconfig/iptables

Note: There are 4 configuration file of DNS, 2 files located in /etc, other 2 files in /var/named

# vim /etc/named.conf

# vim /etc/named.rfc*

# cd /var/named

# cp named.localhost forward.zone

# cp named.loopback reverse.zone

# vim forward.zone
# vim reverse.zone

# chgrp named forward.zone

# chown named reverse.zone

Start named service:

# service named start

To test forward lookup zone:
# dig srv.wtuto.com (to test forward lookup zone)

To test reverse lookup zone:

# dig –x 192.168.1.111

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