Configuration Files

Apache is configured entirely through plain text files. The layout differs between distributions, so knowing where files live is the first step.

Main Configuration File

• Debian/Ubuntu: /etc/apache2/apache2.conf
• Red Hat/CentOS: /etc/httpd/conf/httpd.conf

This file is the entry point. It loads other files using Include directives.

Debian Directory Layout

Debian splits configuration into directories with enabled/available pairs:

• conf-available/ and conf-enabled/ for general snippets.
• mods-available/ and mods-enabled/ for modules.
• sites-available/ and sites-enabled/ for virtual hosts.

The -enabled directories contain symbolic links to files in -available.

Including Other Files

# Load every enabled site configuration
IncludeOptional sites-enabled/*.conf

# Load a single file
Include conf-available/security.conf

Test Before Reloading

Always check syntax before applying changes:

sudo apache2ctl configtest
# or
sudo apachectl -t

A Syntax OK message means it is safe to reload Apache.