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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>www.company1.com</code> and <code>www.company2.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 version 1.3 and
    later.</p>

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<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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<h2><a name="directives" id="directives">Configuration directives</a></h2>

    <ul>
      <li><code class="directive"><a href="../mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code></li>
      <li><code class="directive"><a href="../mod/core.html#namevirtualhost">NameVirtualHost</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 <a href="../programs/httpd.html">the docs for the httpd program</a> for
    other command line options)</p>

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