Configuration of Domain Name Service (D.N.S.)
The DNS system allows us to set up different parts of this database on different servers around the world. If a DNS server does not have the answer, you can configure it to ask other DNS servers for help.
Deamons:
1. named
Configuration Files:
1. /etc/named.conf
2. /var/named/chroot/var/named/*****flu
3. /var/named/chroot/var/named/*****rlu
(i) For configure of DNS firstly install below RPM
# yum install bind+tab
# yum install bind-utils+tab
# yum install system-config-bind+tab
# yum install bind-chroot+tab
# yum install caching-nameserver+tab
(ii) Copy sample file.
# cp /usr/share/system-config-bind/profiles/default/named.conf /var/named/chroot/etc
(iii)
# vi /var/named/chroot/etc/named.conf (For open the named.conf file)
Assign line no through :se nu then copy through ‘y 4’ line no. 20 to 23, paste through ‘p’ in line no. 60 and write in these Line no. 61. Zone “server name server.linux.com”
Line no. 62. type master;
Line no. 63 file “linuxflu”
Line no. 66 Zone “ ip of Server in reverse order Ex.100.168.192.in-addr.arpa.”
Line no. 67 type master
Line no. 68 file “linuxrlu”
20 zone "." IN {
21 type hint;
22 file "named.ca";
23 };
61 zone "linux.com." IN {
62 type master;
63 file "linuxflu";
64 };
65
66 zone "100.168.192.in-addr.arpa." IN {
67 type master;
68 file "linuxrlu";
69 };
70 include "/etc/rndc.key";
Press Esc :wq!
Note:- in line no. 63 & 68 file name can be any but extension should be “flu” & “rlu”
# cp /var/named/chroot/etc/named.conf /etc/named.conf
(iv)
# vim /etc/hosts After open hosts file write ip of server and server name Ex.192.168.100.10 server.linux.com
(v)
# vim /etc/sysconfig/network After open the network file write hostname=servername
Ex:
hostname=server.linux.com
(vi)
# vim /etc/resolv.conf After open the resolv.conf file write
nameserver <ip of server> 192.168.100.1
(vii)
# cd /var/named/chroot/var/named
named# cp named.local linuxflu
named# cp named.local linuxrlu
named# vim linuxflu (After open flu file write below line)
IN SOA server.linux.com. root. (Here write server name instead of given
example with root)
IN NS server.linux.com (Here also write server name instead of given
without root)
server IN A 192.168.100.10 (Here give in starting of the line server & IP of
server)
Example of *****flu file:
$TTL 86400
@ IN SOA server.linux.com. root. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS server.linux.com
IN A 192.168.1.3
Fqdn.linux.com IN A 192.168.1.1
named# vim linuxrlu (After open rlu file write below line instead of
given example)
IN SOA server.linux.com. root. (Here write server name instead of given
example with root)
IN NS server.linux.com. (Here also write server name instead of given
without root)
10 IN PTR server.linux.com. (Here 10 is our last digit of IP address.)
Example of *****rlu file:
$TTL 86400
@ IN SOA server.linux.com. root. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS server.linux.com.
3 IN PTR server.linux.com.
1.1.168.192 IN PTR fqdn.linux.com.
named)# chgrp named linuxflu
named)# chgrp named linuxrlu
named)# chown named linuxflu
named)# chown named linuxrlu
named)#cd
# service network restart
# service named restart
# dig –x <IP add. of server> (If this command fired without any error it
means our named service restart and give you
an answer file.
# nslookup <IP add. of server> (This command also use for check our named
configuration is ok)
Client Side Configuration:
# vi /etc/resolve.conf
search linux.com
nameserver 192.168.1.3 or server.linux.com
Esc :wq
Creating Alias (C name):
# vi /var/named/chroot/var/named/*****flu
client IN A 192.168.1.10 (A record of “192.168.1.10”)
other IN CNAME client (C record of a “client”)
# vi /var/named/chroot/var/named/*****rlu
10 IN PTR client.linux.com
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