最常用的Apache路径有：

/etc/httpd/conf/httpd.conf

/usr/local/apache/conf/httpd.conf

/usr/local/apache2/conf/httpd.conf

Apache 2.2 default layout (apache.org source package):

ServerRoot              ::      /usr/local/apache2
DocumentRoot            ::      /usr/local/apache2/htdocs
Apache Config File      ::      /usr/local/apache2/conf/httpd.conf
Other Config Files      ::      /usr/local/apache2/conf/extra/
SSL Config File         ::      /usr/local/apache2/conf/extra/httpd-ssl.conf
ErrorLog                ::      /usr/local/apache2/logs/error_log
AccessLog               ::      /usr/local/apache2/logs/access_log
cgi-bin                 ::      /usr/local/apache2/cgi-bin (enabled by default, but the bundled scripts are 644)
binaries (apachectl)    ::      /usr/local/apache2/bin
start/stop              ::      /usr/local/apache2/bin/apachectl (start|restart|graceful|graceful-stop|stop|configtest)

Apache 2.0 default layout (apache.org source package):

ServerRoot              ::      /usr/local/apache2
DocumentRoot            ::      /usr/local/apache2/htdocs
Apache Config File      ::      /usr/local/apache2/conf/httpd.conf
SSL Config              ::      /usr/local/apache2/conf/ssl.conf
ErrorLog                ::      /usr/local/apache2/logs/error_log
AccessLog               ::      /usr/local/apache2/logs/access_log
cgi-bin                 ::      /usr/local/apache2/cgi-bin (enabled by default, but the bundled scripts are 644)
binaries (apachectl)    ::      /usr/local/apache2/bin
start/stop              ::      /usr/local/apache2/bin/apachectl (start|stop|graceful|configtest)

Apache 1.3 default layout (apache.org source package):

ServerRoot              ::      /usr/local/apache
DocumentRoot            ::      /usr/local/apache/htdocs
Apache Config File      ::      /usr/local/apache/conf/httpd.conf
ErrorLog                ::      /usr/local/apache/logs/error_log
AccessLog               ::      /usr/local/apache/logs/access_log
cgi-bin                 ::      /usr/local/apache/cgi-bin (enabled by default, but the bundled scripts are 644)
binaries (apachectl)    ::      /usr/local/apache/bin
start/stop              ::      /usr/local/apache/bin/apachectl (start|stop|graceful|configtest)

Debian, Ubuntu (Apache 2):

ServerRoot              ::      /etc/apache2
DocumentRoot            ::      /var/www
Apache Config Files     ::      /etc/apache2/apache2.conf
                        ::      /etc/apache2/ports.conf
Default VHost Config    ::      /etc/apache2/sites-available/default, /etc/apache2/sites-enabled/000-default
Module Locations        ::      /etc/apache2/mods-available, /etc/apache2/mods-enabled
ErrorLog                ::      /var/log/apache2/error.log
AccessLog               ::      /var/log/apache2/access.log
cgi-bin                 ::      /usr/lib/cgi-bin
binaries (apachectl)    ::      /usr/sbin
start/stop              ::      /etc/init.d/apache2 (start|stop|restart|reload|force-reload|start-htcacheclean|stop-htcacheclean)

Notes:

The Debian/Ubuntu layout is fully documented in /usr/share/doc/apache2/README.Debian
Debian/Ubuntu use symlinks to enable vhosts and modules. Configuration files are created in their respective sites-available and mods-available directories. To activate vhosts and modules, symlinks are created in the respective sites-enabled and mods-enabled directories to the config files in either sites-available and mods-available. Debian provides scripts to handle this process called ‘a2ensite’ and ‘a2enmod’ which enables vhosts and modules.
The default DocumentRoot is specified in the default vhost config file, /etc/apache2/sites-available/default
Debian, Ubuntu (Apache 1.3):

ServerRoot              ::      /etc/apache
DocumentRoot            ::      /var/www
ErrorLog                ::      /var/log/apache/error.log
AccessLog               ::      /var/log/apache/access.log
cgi-bin                 ::      /usr/lib/cgi-bin
binaries (apachectl)    ::      /usr/sbin
start/stop              ::      /etc/init.d/apache (start|stop|graceful|configtest)
Fedora Core, CentOS, RHEL:

ServerR