DNS Configuration

1 configuring DNS server:-

[root@puppet ~]# yum install bind* caching-nameserver

2. check some configuration file:-

[root@puppet ~]# vim /etc/sysconfig/network

HOSTNAME=puppet.example.com

2 check /etc/hosts

[root@puppet ~]#vim /etc/hosts

192.168.100.100 puppet.example.com puppet

3 .now configure DNS

[root@puppet ~]# cd /var/named/chroot/etc/

[root@puppet etc]# ll

total 20

-rw-r--r-- 1 root root 265 Dec 22 14:31 localtime

-rw-r----- 1 root named 1230 Jan 18 2010 named.caching-nameserver.conf

-rw-r----- 1 root named 1162 Dec 24 04:10 named.conf

-rw-r----- 1 root named 955 Jan 18 2010 named.rfc1912.zones

-rw-r----- 1 root named 113 Dec 24 03:51 rndc.key

[root@puppet etc]# cp named.caching-nameserver.conf named.conf

[root@puppet etc]# vim named.conf

options {

listen-on port 53 { 127.0.0.1; 192.168.100.100; };

directory "/var/named";

dump-file "/var/named/data/cache_dump.db";

statistics-file "/var/named/data/named_stats.txt";

memstatistics-file "/var/named/data/named_mem_stats.txt";

// Those options should be used carefully because they disable port

// randomization

// query-source port 53;

// query-source-v6 port 53;

allow-query { localhost; any; };

allow-query-cache { localhost; };

};

zone "example.com" IN {

type master;

file "for.zone";

allow-update { none; };

};

zone "100.168.192.in-addr.arpa" IN {

type master;

file "rev.zone";

allow-update { none; };

};

create zone:-

[root@puppet ~]# cd /var/named/chroot/var/named

[root@puppet named]# cp localdomain.zone for.zone

[root@puppet named]# cp -p named.local rev.zone

[root@puppet named]# vim for.zone

$TTL 86400

@ IN SOA puppet.example.com. root.puppet.example.com. (

42 ; serial (d. adams)

3H ; refresh

15M ; retry

1W ; expiry

1D ) ; minimum

IN NS puppet.example.com.

puppet IN A 192.168.100.100

shekhar IN A 192.168.100.99

[root@puppet named]# vim rev.zone

$TTL 86400

@ IN SOA puppet.example.com. root.puppet.example.com. (

1997022700 ; Serial

28800 ; Refresh

14400 ; Retry

3600000 ; Expire

86400 ) ; Minimum

IN NS puppet.example.com.

100 IN PTR puppet.example.com.

Restart DNS Sertver:-

[root@puppet named]# /etc/init.d/named restart

Now check if your DNS working properly:-

[root@puppet named]# dig -x 192.168.100.100

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> -x 192.168.100.100

;; global options: printcmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39336

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:

;100.100.168.192.in-addr.arpa. IN PTR

;; ANSWER SECTION:

100.100.168.192.in-addr.arpa. 86400 IN PTR puppet.example.com.

;; AUTHORITY SECTION:

100.168.192.in-addr.arpa. 86400 IN NS puppet.example.com.

;; ADDITIONAL SECTION:

puppet.example.com. 86400 IN A 192.168.100.100

;; Query time: 22 msec

;; SERVER: 192.168.100.100#53(192.168.100.100)

;; WHEN: Mon Dec 24 22:05:12 2012

;; MSG SIZE rcvd: 108

[root@puppet named]# dig puppet.example.com

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> puppet.example.com

;; global options: printcmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2597

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:

;puppet.example.com. IN A

;; ANSWER SECTION:

puppet.example.com. 86400 IN A 192.168.100.100

;; AUTHORITY SECTION:

example.com. 86400 IN NS puppet.example.com.

;; Query time: 1 msec

;; SERVER: 192.168.100.100#53(192.168.100.100)

;; WHEN: Mon Dec 24 22:06:19 2012

;; MSG SIZE rcvd: 66