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<title>Apache Virtual Host documentation - Apache HTTP Server Version 2.5</title>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a></div><div id="page-content"><div id="preamble"><h1>Apache Virtual Host documentation</h1>
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<a href="../en/vhosts/" title="English"> en </a> |
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<p>The term <cite>Virtual Host</cite> refers to the practice of
running more than one web site (such as
<code>company1.example.com</code> and <code>company2.example.com</code>)
on a single machine. Virtual hosts can be "<a href="ip-based.html">IP-based</a>", meaning that you have a
different IP address for every web site, or "<a href="name-based.html">name-based</a>", meaning that you have
multiple names running on each IP address. The fact that they
are running on the same physical server is not apparent to the
end user.</p>
<p>Apache was one of the first servers to support IP-based
virtual hosts right out of the box. Versions 1.1 and later of
Apache support both IP-based and name-based virtual hosts
(vhosts). The latter variant of virtual hosts is sometimes also
called <em>host-based</em> or <em>non-IP virtual hosts</em>.</p>
<p>Below is a list of documentation pages which explain all
details of virtual host support in Apache HTTP Server:</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#support">Virtual Host Support</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#directives">Configuration directives</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><code class="module"><a href="../mod/mod_vhost_alias.html">mod_vhost_alias</a></code></li><li><a href="name-based.html">Name-based virtual
hosts</a></li><li><a href="ip-based.html">IP-based virtual hosts</a></li><li><a href="examples.html">Virtual host examples</a></li><li><a href="fd-limits.html">File descriptor limits</a></li><li><a href="mass.html">Mass virtual hosting</a></li><li><a href="details.html">Details of host matching</a></li></ul></div>
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<h2><a name="support" id="support">Virtual Host Support</a></h2>
<ul>
<li><a href="name-based.html">Name-based Virtual Hosts</a> (More
than one web site per IP address)</li>
<li><a href="ip-based.html">IP-based Virtual Hosts</a> (An IP
address for each web site)</li>
<li><a href="examples.html">Virtual Host examples for common
setups</a></li>
<li><a href="fd-limits.html">File Descriptor Limits</a> (or,
<em>Too many log files</em>)</li>
<li><a href="mass.html">Dynamically Configured Mass Virtual
Hosting</a></li>
<li><a href="details.html">In-Depth Discussion of Virtual Host
Matching</a></li>
</ul>
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<div class="section">
<h2><a name="directives" id="directives">Configuration directives</a></h2>
<ul>
<li><code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code></li>
<li><code class="directive"><a href="../mod/core.html#servername">ServerName</a></code></li>
<li><code class="directive"><a href="../mod/core.html#serveralias">ServerAlias</a></code></li>
<li><code class="directive"><a href="../mod/core.html#serverpath">ServerPath</a></code></li>
</ul>
<p>If you are trying to debug your virtual host configuration, you
may find the Apache <code>-S</code> command line switch
useful. That is, type the following command:</p>
<div class="example"><p><code>
/usr/local/apache2/bin/httpd -S
</code></p></div>
<p>This command will dump out a description of how Apache parsed
the configuration file. Careful examination of the IP addresses and
server names may help uncover configuration mistakes. (See
the docs for the <code class="program"><a href="../programs/httpd.html">httpd</a></code> program for
other command line options)</p>
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