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8<title>Apache Virtual Host documentation - Apache HTTP Server</title>
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18<p class="apache">Apache HTTP Server Version 2.2</p>
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22<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 2.2</a></div><div id="page-content"><div id="preamble"><h1>Apache Virtual Host documentation</h1>
23<div class="toplang">
24<p><span>Available Languages: </span><a href="/de/vhosts/" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
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33
34
35    <p>The term <cite>Virtual Host</cite> refers to the practice of
36    running more than one web site (such as
37    <code>company1.example.com</code> and <code>company2.example.com</code>)
38    on a single machine. Virtual hosts can be "<a href="ip-based.html">IP-based</a>", meaning that you have a
39    different IP address for every web site, or "<a href="name-based.html">name-based</a>", meaning that you have
40    multiple names running on each IP address. The fact that they
41    are running on the same physical server is not apparent to the
42    end user.</p>
43
44    <p>Apache was one of the first servers to support IP-based
45    virtual hosts right out of the box. Versions 1.1 and later of
46    Apache support both IP-based and name-based virtual hosts
47    (vhosts). The latter variant of virtual hosts is sometimes also
48    called <em>host-based</em> or <em>non-IP virtual hosts</em>.</p>
49
50    <p>Below is a list of documentation pages which explain all
51    details of virtual host support in Apache HTTP Server:</p>
52
53</div>
54<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#support">Virtual Host Support</a></li>
55<li><img alt="" src="/images/down.gif" /> <a href="#directives">Configuration directives</a></li>
56</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
57hosts</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>
58<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
59<div class="section">
60<h2><a name="support" id="support">Virtual Host Support</a></h2>
61
62    <ul>
63      <li><a href="name-based.html">Name-based Virtual Hosts</a> (More
64      than one web site per IP address)</li>
65      <li><a href="ip-based.html">IP-based Virtual Hosts</a> (An IP
66      address for each web site)</li>
67      <li><a href="examples.html">Virtual Host examples for common
68      setups</a></li>
69      <li><a href="fd-limits.html">File Descriptor Limits</a> (or,
70      <em>Too many log files</em>)</li>
71      <li><a href="mass.html">Dynamically Configured Mass Virtual
72      Hosting</a></li>
73      <li><a href="details.html">In-Depth Discussion of Virtual Host
74      Matching</a></li>
75    </ul>
76
77</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
78<div class="section">
79<h2><a name="directives" id="directives">Configuration directives</a></h2>
80
81    <ul>
82      <li><code class="directive"><a href="/mod/core.html#namevirtualhost">NameVirtualHost</a></code></li>
83      <li><code class="directive"><a href="/mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code></li>
84      <li><code class="directive"><a href="/mod/core.html#servername">ServerName</a></code></li>
85      <li><code class="directive"><a href="/mod/core.html#serveralias">ServerAlias</a></code></li>
86      <li><code class="directive"><a href="/mod/core.html#serverpath">ServerPath</a></code></li>
87    </ul>
88
89    <p>If you are trying to debug your virtual host configuration, you
90    may find the Apache <code>-S</code> command line switch
91    useful. That is, type the following command:</p>
92
93    <div class="example"><p><code>
94    /usr/local/apache2/bin/httpd -S
95    </code></p></div>
96
97    <p>This command will dump out a description of how Apache parsed
98    the configuration file. Careful examination of the IP addresses and
99    server names may help uncover configuration mistakes. (See
100    the docs for the <code class="program"><a href="/programs/httpd.html">httpd</a></code> program for
101    other command line options)</p>
102
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105<p><span>Available Languages: </span><a href="/de/vhosts/" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
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112<a href="/zh-cn/vhosts/" hreflang="zh-cn" rel="alternate" title="Simplified Chinese">&nbsp;zh-cn&nbsp;</a></p>
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