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, bind-utils, bind-chroot, caching-nameserver

 

Related Helps: Basic commands vim editor yum

 

DNS SERVER (Configuration):

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*
# yum  install  *caching-nameserver*

Related Topic: DNS (in RHEL6)

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 /var/named/chroot/etc, other 2 files in /var/named/chroot/named

 

# cd  /var/named/chroot/etc

# cp  named.caching-nameserver.conf   named.conf

 

# vim  named.conf
# chown  root:named  named.conf

 

# vim  named.rfc*
# chown  root:named named.rfc*

 

# cd  /var/named/chroot/var/named

# cp localdomain.zone  forward.zone

# cp named.local reverse.zone

 

# vim forward.zone
# vim reverse.zone

 

# chown root:named forward.zone

# chown root: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

 

Complete Configuration Video RHEL 5:

 

Complete Configuration Video RHEL 6: