How to install DNS server on CentOS 5.

In the first time, you must download core software of this service, that are

1. bind
2. caching-nameserver
3. bind-chroot

You can download this software by this command,

# yum -y install bind caching-nameserver bind-chroot

After you downloaded , you can setup follow this instruction :

1. Check your hostname by this command :

# uname -n
dns.aoddy.com

2. Edit /etc/named.conf

options { directory “/var/named”; forwarders {WWW.XXX.YYY.ZZZ;}; // IP of ISP // query-source address * port 53; allow-query { localhost; 192.168.0.0/24;}; // query range allow-transfer { localhost; 192.168.0.0/24;}; // transfer range allow-recursion { localhost; 192.168.0.0/24;}; // recursion range };controls { inet 127.0.0.1 allow { localhost; } keys { rndckey; }; };// here is the section for internal informationsview “internal” { match-clients { localhost; 192.168.0.0/24; }; zone “.” IN { type hint; file “named.ca”; }; zone “mysite.com” IN { // for common resolving type master; file “mysite.com.fwd”; allow-update { none; }; }; zone “0.168.192.in-addr.arpa” IN { // for reverse resolving *note type master; file “mysite.com.rev”; allow-update { none; }; }; zone “localdomain” IN { type master; file “localdomain.zone”; allow-update { none; }; }; zone “localhost” IN { type master; file “localhost.zone”; allow-update { none; }; }; zone “0.0.127.in-addr.arpa” IN { type master; file “named.local”; allow-update { none; }; }; zone “255.in-addr.arpa” IN { type master; file “named.broadcast”; allow-update { none; }; }; zone “0.in-addr.arpa” IN { type master; file “named.zero”; allow-update { none; }; }; }; // here is the section for external informations view “external” { match-clients { any; }; zone “.” IN { type hint; file “named.ca”; }; zone “server-linux.info” IN { // for common resolvin type master; file “server-linux.info.wan”; allow-update { none; }; }; zone “80.0.16.172.in-addr.arpa” IN { // for reverse resolving *note type master; file “80.0.16.172.db”; allow-update { none; }; }; }; include “/etc/rndc.key”;

2. Create /var/named/mysite.com.fwd

$TTL 86400 @ IN SOA dns.mysite.com. root.aoddy.com.( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS dns.mysite.com. IN MX 10 dns.mysite.com. IN MX 20 web.mysite.com. IN A 192.168.0.2 dns IN A 192.168.0.2 web IN A 192.168.0.3

3. Create file /var/named/aoddy.com.rev

$TTL 86400 @ IN SOA dns.aoddy.com. root.mysite.com.( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS dns.aoddy.com. IN MX 10 dns.mysite.com. IN MX 20 web.mysite.com IN PTR dns.mysite.com. 2 IN PTR dns.mysite.com. 3 IN PTR web.mysite.com.

4. Start service

# service named restart

5. Test this server can resolve domain&ip

[root@dns named]# nslookup > dns.mysite.com Server: 192.168.0.2 Address: 192.168.0.2#53Name: dns.mysite.com Address: 192.168.0.2> 192.168.0.2 Server: 192.168.0.2 Address: 192.168.0.2#53 2.0.168.192.in-addr.arpa name = dns.mysite.com. >

6. If your service can’t resolve , you can check on your file config by this command :

# named-checkconf