Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007 Installation Manual page 776

IMPORTANT: Including Configuration Files for External Modules
If you have activated external modules manually, make sure to load their con-
figuration files in all virtual host configurations. Configuration files for external
modules are located under /etc/apache2/conf.d/ and are not loaded by
default. If you need the same modules on each virtual host, you can include *
.conf from this directory. Otherwise include individual files. See /etc/
apache2/vhost.d/vhost.template for examples.
40.4.3 Base and Extension Modules
All base and extension modules are described in detail in the Apache documentation.
Only a brief description of the most important modules is available here. Refer to
http://httpd.apache.org/docs/2.2/mod/
module.
mod_actions
Provides methods to execute a script whenever a certain MIME type (such as
application/pdf), a file with a specific extension (like .rpm), or a certain
request method (such as GET) is requested. This module is enabled by default.
mod_alias
Provides Alias and Redirect directives with which you can map a URl to a
specific directory (Alias) or redirect a requested URL to another location. This
module is enabled by default.
mod_auth*
The authentication modules provide different authentication methods: basic authen-
tication with mod_auth_basic or digest authentication with mod_auth_digest. Digest
authentication in Apache 2.2 is considered experimental.
mod_auth_basic and mod_auth_digest must be combined with an authentication
provider module, mod_authn_* (for example, mod_authn_file for text file–based
authentication) and with an authorization module mod_authz_* (for example,
mod_authz_user for user authorization).
More information about this topic is available in the "Authentication HOWTO" at
http://httpd.apache.org/docs/2.2/howto/auth.html
758 Installation and Administration
to learn details about each