<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
              This file is generated from xml source: DO NOT EDIT
        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
      -->
<title>Dynamic mass virtual hosts with mod_rewrite - Apache HTTP Server</title>
<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
<script src="../style/scripts/prettify.js" type="text/javascript">
</script>

<link href="../images/favicon.ico" rel="shortcut icon" /></head>
<body id="manual-page"><div id="page-header">
<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.4</p>
<img alt="" src="../images/feather.gif" /></div>
<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
<div id="path">
<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Rewrite</a></div><div id="page-content"><div id="preamble"><h1>Dynamic mass virtual hosts with mod_rewrite</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/rewrite/vhosts.html" title="English">&nbsp;en&nbsp;</a> |
<a href="../fr/rewrite/vhosts.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
</div>


<p>This document supplements the <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>
<a href="../mod/mod_rewrite.html">reference documentation</a>. It describes
how you can use <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> to create dynamically
configured virtual hosts.</p>

<div class="warning">mod_rewrite is not the best way to configure
virtual hosts. You should first consider the <a href="../vhosts/mass.html">alternatives</a> before resorting to
mod_rewrite. See also the "<a href="avoid.html#vhosts">how to avoid
mod_rewrite</a> document.</div>

</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#per-hostname">Virtual Hosts For Arbitrary Hostnames</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#simple.rewrite">Dynamic
    Virtual Hosts Using <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#xtra-conf">Using a Separate Virtual Host Configuration File</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><a href="../mod/mod_rewrite.html">Module documentation</a></li><li><a href="intro.html">mod_rewrite introduction</a></li><li><a href="remapping.html">Redirection and remapping</a></li><li><a href="access.html">Controlling access</a></li><li><a href="proxy.html">Proxying</a></li><li><a href="rewritemap.html">RewriteMap</a></li><li><a href="advanced.html">Advanced techniques</a></li><li><a href="avoid.html">When not to use mod_rewrite</a></li></ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="per-hostname" id="per-hostname">Virtual Hosts For Arbitrary Hostnames</a></h2>

  

  <dl>
    <dt>Description:</dt>

    <dd>
    <p>We want to automatically create a virtual host for every hostname
    which resolves in our domain, without having to create
    new VirtualHost sections.</p>

    <p>In this recipe, we assume that we'll be using the hostname
    <code>www.<strong>SITE</strong>.example.com</code> for each
    user, and serve their content out of
    <code>/home/<strong>SITE</strong>/www</code>.</p>
    </dd>

    <dt>Solution:</dt>

    <dd>

<pre class="prettyprint lang-config">
RewriteEngine on

RewriteMap    lowercase int:tolower

RewriteCond   ${lowercase:%{<strong>HTTP_HOST</strong>}}   ^www\.<strong>([^.]+)</strong>\.example\.com$
RewriteRule   ^(.*) /home/<strong>%1</strong>/www$1
</pre>
</dd>

<dt>Discussion</dt>
    <dd>

    <div class="warning">You will need to take care of the DNS
    resolution - Apache does
    not handle name resolution. You'll need either to create CNAME
    records for each hostname, or a DNS wildcard record. Creating DNS
    records is beyond the scope of this document.</div>

<p>The internal <code>tolower</code> RewriteMap directive is used to
ensure that the hostnames being used are all lowercase, so that there is
no ambiguity in the directory structure which must be created.</p>

<p>Parentheses used in a <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code> are captured into the
backreferences <code>%1</code>, <code>%2</code>, etc, while parentheses
used in <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> are
captured into the backreferences <code>$1</code>, <code>$2</code>,
etc.</p>

<p>
As with many techniques discussed in this document, mod_rewrite really
isn't the best way to accomplish this task. You should, instead,
consider using <code class="module"><a href="../mod/mod_vhost_alias.html">mod_vhost_alias</a></code> instead, as it will much
more gracefully handle anything beyond serving static files, such as any
dynamic content, and Alias resolution.
</p>
    </dd>
  </dl>

</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="simple.rewrite" id="simple.rewrite">Dynamic
    Virtual Hosts Using <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code></a></h2>

    <p>This extract from <code>httpd.conf</code> does the same
    thing as <a href="#per-hostname">the first example</a>. The first
    half is very similar to the corresponding part above, except for
    some changes, required for backward compatibility and to make the
    <code>mod_rewrite</code> part work properly; the second half
    configures <code>mod_rewrite</code> to do the actual work.</p>

    <p>Because <code>mod_rewrite</code> runs before other URI translation
    modules (e.g., <code>mod_alias</code>), <code>mod_rewrite</code> must
    be told to explicitly ignore any URLs that would have been handled
    by those modules. And, because these rules would otherwise bypass
    any <code>ScriptAlias</code> directives, we must have
    <code>mod_rewrite</code> explicitly enact those mappings.</p>

<pre class="prettyprint lang-config">
# get the server name from the Host: header
UseCanonicalName Off

# splittable logs
LogFormat "%{Host}i %h %l %u %t \"%r\" %s %b" vcommon
CustomLog logs/access_log vcommon

&lt;Directory /www/hosts&gt;
    # ExecCGI is needed here because we can't force
    # CGI execution in the way that ScriptAlias does
    Options FollowSymLinks ExecCGI
&lt;/Directory&gt;

RewriteEngine On

# a ServerName derived from a Host: header may be any case at all
RewriteMap  lowercase  int:tolower

## deal with normal documents first:
# allow Alias /icons/ to work - repeat for other aliases
RewriteCond  %{REQUEST_URI}  !^/icons/
# allow CGIs to work
RewriteCond  %{REQUEST_URI}  !^/cgi-bin/
# do the magic
RewriteRule  ^/(.*)$  /www/hosts/${lowercase:%{SERVER_NAME}}/docs/$1

## and now deal with CGIs - we have to force a handler
RewriteCond  %{REQUEST_URI}  ^/cgi-bin/
RewriteRule  ^/(.*)$  /www/hosts/${lowercase:%{SERVER_NAME}}/cgi-bin/$1  [H=cgi-script]
</pre>


</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="xtra-conf" id="xtra-conf">Using a Separate Virtual Host Configuration File</a></h2>

    <p>This arrangement uses more advanced <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>
    features to work out the translation from virtual host to document
    root, from a separate configuration file. This provides more
    flexibility, but requires more complicated configuration.</p>

    <p>The <code>vhost.map</code> file should look something like
    this:</p>

<div class="example"><p><code>
customer-1.example.com  /www/customers/1<br />
customer-2.example.com  /www/customers/2<br />
# ...<br />
customer-N.example.com  /www/customers/N<br />
</code></p></div>

    <p>The <code>httpd.conf</code> should contain the following:</p>

<pre class="prettyprint lang-config">
RewriteEngine on

RewriteMap   lowercase  int:tolower

# define the map file
RewriteMap   vhost      txt:/www/conf/vhost.map

# deal with aliases as above
RewriteCond  %{REQUEST_URI}               !^/icons/
RewriteCond  %{REQUEST_URI}               !^/cgi-bin/
RewriteCond  ${lowercase:%{SERVER_NAME}}  ^(.+)$
# this does the file-based remap
RewriteCond  ${vhost:%1}                  ^(/.*)$
RewriteRule  ^/(.*)$                      %1/docs/$1

RewriteCond  %{REQUEST_URI}               ^/cgi-bin/
RewriteCond  ${lowercase:%{SERVER_NAME}}  ^(.+)$
RewriteCond  ${vhost:%1}                  ^(/.*)$
RewriteRule  ^/(.*)$                      %1/cgi-bin/$1 [H=cgi-script]
</pre>


</div></div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/rewrite/vhosts.html" title="English">&nbsp;en&nbsp;</a> |
<a href="../fr/rewrite/vhosts.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a></p>
</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
<script type="text/javascript"><!--//--><![CDATA[//><!--
var comments_shortname = 'httpd';
var comments_identifier = 'http://httpd.apache.org/docs/2.4/rewrite/vhosts.html';
(function(w, d) {
    if (w.location.hostname.toLowerCase() == "httpd.apache.org") {
        d.write('<div id="comments_thread"><\/div>');
        var s = d.createElement('script');
        s.type = 'text/javascript';
        s.async = true;
        s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier;
        (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s);
    }
    else { 
        d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>');
    }
})(window, document);
//--><!]]></script></div><div id="footer">
<p class="apache">Copyright 2013 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
if (typeof(prettyPrint) !== 'undefined') {
    prettyPrint();
}
//--><!]]></script>
</body></html>