Configure-BIND DNS server

 

                               DNS

Introduction on BIND

BIND or named is the most widely used DNS software on the Internet. The name originates as an acronym from Berkeley Internet Name Domain. The Internet Domain Name System (DNS) consists of the syntax to specify the names of entities in the Internet in a hierarchical manner, the rules used for delegating authority over names, and the system implementation that actually maps names to Internet addresses. DNS data is maintained in a group of distributed hierarchical databases.

It stores information for mapping Internet host names to IP addresses and vice versa, mail routing information, and other data used by Internet applications.

Installation and Configuration of BIND

#cd

# wget ftp://ftp.isc.org/isc/bind9/9.3.2/bind-9.3.2.tar.gz

# unzip bind-9.3.2.tar.gz

# tar -xvf bind-9.3.2.tar

-To Download and extract

# cd bind-9.3.2/

# ./configure --prefix=/usr/local --disable-ipv6

# make && make install

-To configure and install BIND

# mkdir -p /chroot/named

# groupadd named

# useradd -g named -d /chroot/named -s /bin/true named

# passwd -l named

-To create a user 'named' with home directory '/chroot/named'

# cd /chroot/named

# mkdir dev etc logs conf

# mkdir -p var/run

# mknod dev/null c 1 3

# mknod dev/zero c 1 5

# mknod dev/random c 1 8

# cp /etc/localtime etc

-To create directories and device files for the working of bind.

# ln -s /chroot/named/etc/named.conf /etc/named.conf

-To create the named.conf file which the main configuration file of BIND

Add the following contents in the /etc/named.conf file

options {

directory "/conf";

pid-file "/var/run/named.pid";

statistics-file "/var/run/named.stats";

dump-file "/var/run/named.db";

recursion yes;

version "Just bad luck";

};

# onedomain.com

zone "onedomain.com" in {

type master;

file "onedomain.for";

notify no;

};

#twodomain.com

zone "twodomain.com" in {

type master;

file "twodomain.for";

notify no;

};

Create a file 'onedomain.for' in '/chroot/named/conf' with the following contents in it. It is the zone file for onedomain.com

;onedomain.for

;

$TTL 86400

@ IN SOA ns.onedomain.com. mail.onedomain.com (

450 ; serial (d. adams)

3H ; refresh

15M ; retry

1W ; expiry

1D ) ; minimum

@ IN NS ns.onedomain.com.

ns IN A 192.168.1.193

@ IN A 192.168.1.193

www IN CNAME onedomain.com.

Create a file 'twodomain.for' in '/chroot/named/conf' with the following contents in it. It is the zone file for twodomain.com

;twodomain.for

;

$TTL 86400

@ IN SOA ns.twodomain.com. mail.twodomain.com (

451 ; serial (d. adams)

3H ; refresh

15M ; retry

1W ; expiry

1D ) ; minimum

@ IN NS ns.twodomain.com

ns IN A 192.168.1.194

@ IN A 192.168.1.194

www IN CNAME twodomain.com.

# chown named:named /chroot/named
# chown -R named:named /chroot/named/var
# chmod 700 /chroot/named

# named-checkzone onedomain.for /chroot/named/conf/onedomain.for

zone onedomain.for/IN: loaded serial 450

OK

# named-checkzone twodomain.for /chroot/named/conf/twodomain.for

zone twodomain.for/IN: loaded serial 451

OK

# named-checkconf /etc/named.conf

-To check the configuration file

# /usr/local/sbin/named -t /chroot/named -u named -c /etc/named.conf

-To start named service.

# ps -fCnamed

UID PID PPID C STIME TTY TIME CMD

named 17611 1 0 11:34 ? 00:00:00 /usr/local/sbin/named -t /chroot/named -u named -c /etc/named.conf

-To check whether the named service is started or not.

# nslookup www.onedomain.com

Server: 127.0.0.1

Address: 127.0.0.1#53

www.onedomain.com canonical name = onedomain.com.

Name: onedomain.com

Address: 192.168.1.193

# nslookup www.twodomain.com

Server: 127.0.0.1

Address: 127.0.0.1#53

www.twodomain.com canonical name = twodomain.com.

Name: twodomain.com

Address: 192.168.1.194

# dig +short @192.168.1.193 -c CH -t txt version.bind

"Just bad luck"