Addon & Subdomain DNS Entries

$TTL    86400
$ORIGIN sym.com.
@               IN SOA  ns.sym.com.       root.sym.com. (
2011022300              ; serial (d. adams)
900             ; refresh
900             ; retry
900             ; expiry
900 )           ; minimum

sym.com.        IN A            192.168.2.158
IN NS                ns.sym.com.
IN MX   10   gmail.com.

ns                   IN A            192.168.2.158

Output:
[root@158 ~]# host sym.com
sym.com has address 192.168.2.158
sym.com mail is handled by 10 gmail.com.

$TTL    86400
$ORIGIN sym.com.
@               IN SOA  ns.sym.com.       root.sym.com. (
2011022300              ; serial (d. adams)
900             ; refresh
900             ; retry
900             ; expiry
900 )           ; minimum

sym.com.        IN A            192.168.2.158
IN NS                ns.sym.com.
ns              IN A            192.168.2.158
sym2             IN A   192.168.2.158 //subdomain entry

goto cd /usr/local/apache2/htdocs/
mkdir sym2
vim index.html
goto cd /usr/local/apache2/conf/extra/
vim httpd-vhosts.conf
Main domain:

#ServerAdmin webmaster@dummy-host.example.com
DocumentRoot “/usr/local/apache2/htdocs”
ServerName sym.com
DirectoryIndex index.html
#Redirect / http://www.gmail.com
#DirectoryIndex index.html index.php
#ServerAlias www.dummy-host.example.com
#ErrorLog “logs/dummy-host.example.com-error_log”
#CustomLog “logs/dummy-host.example.com-access_log” common

sub-domain & addon-domain :

DocumentRoot “/usr/local/apache2/htdocs/sym2”
ServerName sym2.com              //addon domain
ServerAlias sym2.sym.com             //subdomain

restart
lynx sym.com
lynx sym2.com
lynx sym2.sym.com  //addon domain
lynx sym.com/sym2  //sub domain