Dynamic DocumentRoot for Sub-Domains.

If you have plenty of sub-domains and every subdomain routes in another directory on the server, This can be done dynamically.

Add folling in httpd.conf/httpd-vhost.conf

<\VirtualHost *:80\>
    ServerName www.kishor.com
    ServerAlias www.kishor.com
    ServerAlias kishor.com
    ServerAlias *.kishor.com   
    RewriteEngine  on
    RewriteCond    %{HTTP_HOST}  ^kishor.com
    RewriteRule    ^(.*)$        /var/www/html/$1 [L]
    RewriteCond    %{HTTP_HOST}  ^www.*
    RewriteRule    ^(.*)$        /var/www/html/$1 [L]
    RewriteCond    %{HTTP_HOST}  ^(.*)\.kishor\.com
    RewriteRule    ^(.*)$        /%1/$1 [L]
    ErrorDocument 404 http://www.kishor.com
<\/VirtualHost\>


As you can see, the DocumentRoot is //var/www/html/. This is the directory where all other sub-directories for the sub-domains are located.

We use the RewriteEngine to decide which directory we want. The first RewriteCond is to route the domain without any sub-domain into the www directory. The second RewriteCond demonstrates how the third RewriteCond works with any subdomain.

www.kishor.com  =>  /var/www/html/www/
test.kishor.com  =>  /var/www/html/test/
gavali.kishor.com  =>  /var/www/html/gavali/


Finally setup your domain as wildcard domain *.kishor.com in your DNS and enjoy the Dynamic Hosting.