DNS stands for Domain Name System and is a a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. In other words DNS translate human readable hostnames such as test.org into machine readable ip addresses such as 89.36.25.239.
Preliminary notes
- Server Name: ns.test.org
- Server IP: 172.20.30.1/24
Install required software packages
[codesyntax lang="bash"]
yum install bind bind-libs bind-utils
[/codesyntax]
Set BIND service to start on system boot
[codesyntax lang="bash"]
chkconfig named on
[/codesyntax]
Start named service for generating some default configuration files.
/etc/init.d/named start
Note: In case the command above hangs there is an entropy problem. You should install haveged daemon. More details here.
If you don't want to install haveged daemon there is a workaround:
[codesyntax lang="bash"]
rndc-confgen -a -r /dev/urandom
[/codesyntax]
Edit main configuration file and add zone entry of www.test.org
[codesyntax lang="bash"]
vim /etc/named.conf
[/codesyntax]
options {
forwarders { 8.8.8.8; 8.8.4.4; };
listen-on port 53 { any; };
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";
allow-query { any; };
allow-query-cache { any; };
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
zone "." IN {
type hint;
file "named.ca";
};
zone "test.org" {
type master;
file "test.org";
};
zone "30.20.172.in-addr.arpa" {
type master;
file "30.20.172.in-addr.arpa";
};
Create Zone files which we mentioned in named.conf file
[codesyntax lang="bash"]
cd /var/named vim /var/named/test.org
[/codesyntax]
$ORIGIN test.org.
$TTL 1H
test.org. IN SOA ns.test.org. root.test.org. (
2012062600 ; serial
12H ; refresh
2H ; retry
1W ; expiry
2D ) ; minimum
test.org. IN NS ns.test.org.
ns.test.org. IN A 172.20.30.1
www10 IN A 172.20.30.10
www11 IN A 172.20.30.11
www12 IN A 172.20.30.12
www13 IN A 172.20.30.13
www14 IN A 172.20.30.14
www15 IN A 172.20.30.15
[codesyntax lang="bash"]
vim /var/named/30.20.172.in-addr.arpa
[/codesyntax]
$ORIGIN 30.20.172.in-addr.arpa.
$TTL 2D
@ IN SOA ns.test.org. root.test.org. (
2012062600 ; serial
12H ; refresh
2H ; retry
1W ; expiry
2D ) ; minimum
@ IN NS ns.test.org.
1 IN PTR ns.test.org.
10 IN PTR www10.test.org.
11 IN PTR www11.test.org.
12 IN PTR www12.test.org.
13 IN PTR www13.test.org.
14 IN PTR www14.test.org.
15 IN PTR www15.test.org.
Restart named service
[codesyntax lang="bash"]
/etc/init.d/named restart
[/codesyntax]
Update /etc/resolv.conf file
[codesyntax lang="bash"]
echo "search test.org" > /etc/resolv.conf echo "nameserver 127.0.0.1" >> /etc/resolv.conf
[/codesyntax]
Source: http://www.broexperts.com/2012/03/linux-dns-bind-configuration-on-centos-6-2/
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