Apache Modules mod vhost alias

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Here is an example of utilizing Apache's mod_vhost_alias module for dynamic virtual hosting.

File: /etc/conf.d/apache2 

...
APACHE2_OPTS="-D DYNAMIC_VHOSTS -D PHP5"
...
File: /etc/apache2/httpd.conf 

...
LoadModule vhost_alias_module            modules/mod_vhost_alias.so
...
Note: The CustomLog directive in 10_dynamic_vhosts.conf is set to log into <local_dir>/logs. By default, current Gentoo installations of apache2 have this set to /usr/apache. This will not work in most cases
File: /etc/apache2/vhosts.d/10_dynamic_vhosts.conf 

### Dynamic Virtual Hosts
#
# Dynamic VirtualHost: If you want to maintain multiple domains/hostnames on
# your machine and have the process be semi-automatted, you can enable dynamic
# virtual hosts.  Apache will automatically host folders under /var/www/vhosts
# as their corresponding domain names.  An example of this is:
# If you create the folder example.com under /var/www/vhosts, now Apache can
# serve pages for example.com using the /var/www/vhosts/example.com folder.
#
# Hint: Aliasing the sub-domain www.[example.com] can be easily accomplished
# by simply simlinking www.[example.com] to [example.com].
#
# Please see the documentation at
# <URL:http://httpd.apache.org/docs-2.0/vhosts/>
# and
# <URL:http://www.apache.org/docs/vhosts/mass.html>
# for further details before you try to setup virtual hosts.
#
# Note: Dynamic Virtual Hosts uses the mod_vhost_alias apache module.

<IfDefine DYNAMIC_VHOSTS>
  #
  # Use name-based virtual hosting.
  #
  NameVirtualHost *:80
  UseCanonicalName Off
  LogFormat "%V %h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-Agent}i\"" dynamic_vhosts
  CustomLog logs/access_log dynamic_vhosts

  <VirtualHost *:80>
    #
    # Security Directive
    #
    <Directory "/var/www/vhosts">
      #
      # Possible values for the Options directive are "None", "All",
      # or any combination of:
      #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
      #
      # Note that "MultiViews" must be named *explicitly* --- "Options All"
      # doesn't give it to you.
      #
      # The Options directive is both complicated and important.  Please see
      # http://httpd.apache.org/docs-2.0/mod/core.html#options
      # for more information.
      #
      Options -Indexes FollowSymLinks MultiViews

      #
      # AllowOverride controls what directives may be placed in .htaccess files.
      # It can be "All", "None", or any combination of the keywords:
      #   Options FileInfo AuthConfig Limit
      #
      AllowOverride All

      #
      # Controls who can get stuff from the dynamic virtual hosts.
      #
      Order allow,deny
      Allow from all
    </Directory>

    # Dynamic Virtual Host Definitions
    #
    <IfModule mod_vhost_alias.c>
      # example.com              -->  /var/www/vhosts/example.com/htdocs
      # www.example.com          -->  /var/www/vhosts/www.example.com/htdocs
      # a.www.example.com        -->  /var/www/vhosts/a.www.example.com/htdocs
      # www.example.com/cgi-bin  -->  /var/www/vhosts/www.example.com/cgi-bin
      VirtualDocumentRoot /var/www/vhosts/%0.0/htdocs
      VirtualScriptAlias /var/www/vhosts/%0.0/cgi-bin

      # example.com              -->  /var/www/vhosts/example.com
      # www.example.com          -->  /var/www/vhosts/www.example.com
      # a.www.example.com        -->  /var/www/vhosts/a.www.example.com
      # www.example.com/cgi-bin  -->  /var/www/vhosts/www.example.com/cgi-bin
      #VirtualDocumentRoot /var/www/vhosts/%0.0
      #VirtualScriptAlias /var/www/vhosts/%0.0/cgi-bin

      # example.com              -->  /var/www/vhosts/example.com
      # www.example.com          -->  /var/www/vhosts/example.com
      # a.www.example.com        -->  /var/www/vhosts/example.com
      # www.example.com/cgi-bin  -->  /var/www/vhosts/example.com/cgi-bin
      #VirtualDocumentRoot /var/www/vhosts/%-2.0.%-1.0
      #VirtualScriptAlias /var/www/vhosts/%-2.0.%-1.0/cgi-bin

      # example.com              -->  /var/www/vhosts/example.com/_
      # www.example.com          -->  /var/www/vhosts/example.com/www
      # a.www.example.com        -->  /var/www/vhosts/example.com/a.www
      # example.com/cgi-bin      -->  /var/www/vhosts/example.com/_/cgi-bin
      # www.example.com/cgi-bin  -->  /var/www/vhosts/example.com/a.www/cgi-bin
      #VirtualDocumentRoot /var/www/vhosts/%-2.0.%-1.0/%-3+/
      #VirtualScriptAlias /var/www/vhosts/%-2.0.%-1.0/%-3+/cgi-bin



      # CGI Directives
      #
      <DirectoryMatch "^/var/www/vhosts/[^/]+/cgi-bin">
        AllowOverride None
        Options ExecCGI
        <IfModule mod_access.c>
          Order allow,deny
          Allow from all
        </IfModule>
      </DirectoryMatch>
    </IfModule>

  </VirtualHost>

</IfDefine>
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