The goal of this small ruby program is to generate dozen of apache vhost with snippets.

Each vhost can go on many web server ( with load-balancing by example ).

1) A config file with your different servers configuration and parameters

$ cat config.rb 
@servers=
{
'server01' => {
	'HTTP_PORT' 		=> '80',
	'HTTPS_PORT'		=> '443',
	'SERVER_NAME' 		=> 'web1',
	'SERVER_IP'		=> '192.168.0.100'
	},
'server02' => {
        'HTTP_PORT'             => '80',
        'HTTPS_PORT'            => '443',
        'SERVER_NAME'            => 'web2',
	'SERVER_IP'             => '192.168.0.101'
        }
}

2) Define some snippets

$ cat snippet/aliases 
Alias 	/css	/usr/local/share/#{project}/css
Alias   /js     /usr/local/share/#{project}/js

3) Define some vhosts using previous definitions

$ cat src/project01
#setconfig:project=mywebsite
<VirtualHost #{SERVER_IP}:#{HTTP_PORT}>
    ServerName www.#{project}.com
    ServerAlias #{SERVER_NAME}.#{project}.com
#{snippet:aliases}
</VirtualHost>

$ cat src/project02
#setconfig:project=anotherwebsite
<VirtualHost #{SERVER_IP}:#{HTTP_PORT}>
    ServerName www.#{project}.com
    ServerAlias #{SERVER_NAME}.#{project}.com
#{snippet:aliases}
</VirtualHost>

4) Launch atpl

$ ./atpl.rb 
 * server01
..
 * server02
..

5) Use the result in your servers

$ cat generated/server01/project01 
# Generated by atpl - https://code.google.com/p/atpl/
# Mon Dec 07 22:59:32 +0100 2009
<VirtualHost 192.168.0.100:80>
    ServerName www.mywebsite.com
    ServerAlias web1.mywebsite.com
Alias 	/css	/usr/local/share/mywebsite/css
Alias   /js     /usr/local/share/mywebsite/js

</VirtualHost>

$ cat generated/server01/project02
# Generated by atpl - https://code.google.com/p/atpl/
# Mon Dec 07 22:59:32 +0100 2009
<VirtualHost 192.168.0.100:80>
    ServerName www.anotherwebsite.com
    ServerAlias web1.anotherwebsite.com
Alias 	/css	/usr/local/share/anotherwebsite/css
Alias   /js     /usr/local/share/anotherwebsite/js

</VirtualHost>

$ cat generated/server02/project01 
# Generated by atpl - https://code.google.com/p/atpl/
# Mon Dec 07 22:59:32 +0100 2009
<VirtualHost 192.168.0.101:80>
    ServerName www.mywebsite.com
    ServerAlias web2.mywebsite.com
Alias 	/css	/usr/local/share/mywebsite/css
Alias   /js     /usr/local/share/mywebsite/js

</VirtualHost>

$ cat generated/server02/project02
# Generated by atpl - https://code.google.com/p/atpl/
# Mon Dec 07 22:59:32 +0100 2009
<VirtualHost 192.168.0.101:80>
    ServerName www.anotherwebsite.com
    ServerAlias web2.anotherwebsite.com
Alias 	/css	/usr/local/share/anotherwebsite/css
Alias   /js     /usr/local/share/anotherwebsite/js

</VirtualHost>