Apache Modules
Apache is a modular server. This implies that only the most basic functionality is included in the core server. Extended features are available through modules which can be loaded into Apache. By default, a base set of modules is included in the server at compile-time. If the server is compiled to use dynamically loaded modules, then modules can be compiled separately, and added at any time using the LoadModule directive. Otherwise, Apache must be recompiled to add or remove modules. Ubuntu compiles Apache2 to allow the dynamic loading of modules. Configuration directives may be conditionally included on the presence of a particular module by enclosing them in an <IfModule> block. You can install additional Apache2 modules and use them with your Web server. You can install Apache2 modules using the apt-get command. For example, to install the Apache2 module for MYSQL authentication, you can run the following command from a terminal prompt:
sudo apt-get install libapache2-mod-auth-mysql
Once you install the module, the module will be available in the /etc/apache2/mods-available directory. You can use the a2enmod command to enable a module. You can use the a2dismod command to disable a module. Once you enable the module, the module will be available in the the /etc/apache2/mods-enabled directory.
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