dns configuration in ubuntu

DNS (Domain naming system);

In the world of internet a human cant memorize each and every ip address of the websites, so the ip address of the site is resloved by the name so that the humans can memorize easily. For this purpose the dns is used it will resolve the website with ipaddress and viceversa. How to configure dns in ubuntu is shown below

my dns server ipaddress is 192.168.1.35 with the hostname ubuntu111

other system connected in lan are 192.168.1.34 with hostname ubuntu100

and other with ipaddress 192.168.1.28 with hostname venky

here I will reslove a fully qualified domain I.e; ubuntu111.team.com

for this we have to give the static ip for the server

#vim /etc/network/interfaces

auto eth0

iface eth0 inet static

address 192.168.1.35

netmask 255.255.255.0

network 192.168.1.0

gateway 192.168.1.1

broadcast 192.168.1.255

:wq!

Here also set hostname

#vim /etc/hostname

ubuntu111

:wq!

And also set hosts file

#vim /etc/hosts

192.168.1.35 ubuntu111.team.com ubuntu111

:wq!

then go to dns of your system

#vim /etc/reslov.conf

search team.com.

nameserver 192.168.1.35  #(it is the dns server ip address in which you are creating)#

Then install bind package

#apt-get install bind9 dnsutils

here we will edit two files /etc/bind/named.conf.options & /etc/bind/named.conf.local

#vim /etc/bind/named.conf.options

forwaders {

192.168.1.1; #(this is gateway of your router)

123.176.37.37; (this is the default of your dns server provided by internet seen in reslov.conf)

123.176.37.35;

8.8.8.8;

8.8.4.4;

};

save and quit

#vim /etc/bind/named.conf.local

zone "team.com"

{

type master;

file "/etc/bind/zones/team.com.db";

};

zone "1.168.192.in-addr.arpa"

{

type master;

file "/etc/bind/zones/rev.1.168.192.in-addr.arpa";

};

save and quit

here we will create a directory named zone in bind

#mkdir /etc/bind/zones

#vim /etc/bind/zones/team.com.db

#vim /etc/bind/zones/ rev.1.168.192.in-addr.arpa

then we will restart the bind service

#/etc/init.d/bind9 restart

to check the dns is working or not type

#dig ubuntu111.team.com

#nslookup ubuntu111.team.com

#nslookup ubuntu100.team.com

#nslookup venky.team.com

here he have created the dns server successfully