The Status module allows a server administrator to find out how well their server is performing.

This module is normaly enable by default on ubuntu.

On a ubuntu distribution, you can edit the file
etc/apache2/mods-available/status.conf
for your personal configuration; for example to allow only from your ip.

Complete description can be found at apache website.

This is the first step to boost your drupal site (or any other aplications using PHP). More ways to improve your site are to come.

APC (Alternative PHP Cache) is a PHP extension that will boost up your php scripts. It is part of PECL (a repository for PHP Extensions)

1. In my ubuntu server "make" was not installed and you will need it to compile the code of the uploadprogress pecl extension. apt-get install make
2. Next we need "phpize" which will compile the code to make it part of the php library. apt-get install php5-dev
3. The next line will download and compile the pecl extension.

IP-based virtual hosts use the IP address of the connection to determine the correct virtual host to serve. Therefore you need to have a separate IP address for each host. With name-based virtual hosting, the server relies on the client to report the hostname as part of the HTTP headers. Using this technique, many different hosts can share the same IP address.