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d8b1dfd3ecab967303893dd6e5072f15aa393ca6nd --><title>Apache Virtual Host documentation - 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 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="/faq/">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p><p class="apache">Apache HTTP Server Version 2.1</p><img alt="" src="/images/feather.gif" /></div><div class="up"><a href="../"><img title="<-" alt="<-" src="/images/left.gif" /></a></div><div id="path"><a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.1</a></div><div id="page-content"><div id="preamble"><h1>Apache Virtual Host documentation</h1>
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen <p>The term <cite>Virtual Host</cite> refers to the practice of
10ca15b877e1d7f36b5d4ccd0a38e984cd635da4rbowen running more than one web site (such as
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <code>www.company1.com</code> and <code>www.company2.com</code>)
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess on a single machine. Virtual hosts can be "<a href="ip-based.html">IP-based</a>," meaning that you have a
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess different IP address for every web site, or "<a href="name-based.html">name-based</a>," meaning that you have
2bd55c0d474884fe40c4a081efcbd82bc1c913a8rbowen multiple names running on each IP address. The fact that they
2bd55c0d474884fe40c4a081efcbd82bc1c913a8rbowen are running on the same physical server is not apparent to the
2bd55c0d474884fe40c4a081efcbd82bc1c913a8rbowen end user.</p>
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen <p>Apache was one of the first servers to support IP-based
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen virtual hosts right out of the box. Versions 1.1 and later of
10ca15b877e1d7f36b5d4ccd0a38e984cd635da4rbowen Apache support both IP-based and name-based virtual hosts
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen (vhosts). The latter variant of virtual hosts is sometimes also
10ca15b877e1d7f36b5d4ccd0a38e984cd635da4rbowen called <em>host-based</em> or <em>non-IP virtual hosts</em>.</p>
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen <p>Below is a list of documentation pages which explain all
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen details of virtual host support in Apache version 1.3 and
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess</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>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <code class="module"><a href="/mod/mod_vhost_alias.html">mod_vhost_alias</a></code>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess</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="support" id="support">Virtual Host Support</a></h2>
2bd55c0d474884fe40c4a081efcbd82bc1c913a8rbowen <li><a href="name-based.html">Name-based Virtual Hosts</a> (More
2bd55c0d474884fe40c4a081efcbd82bc1c913a8rbowen than one web site per IP address)</li>
10ca15b877e1d7f36b5d4ccd0a38e984cd635da4rbowen <li><a href="ip-based.html">IP-based Virtual Hosts</a> (An IP
10ca15b877e1d7f36b5d4ccd0a38e984cd635da4rbowen address for each web site)</li>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><a href="examples.html">Virtual Host examples for common
48160cfe05c7614376dc7b1f57f5493eb73f06dbrbowen <li><a href="fd-limits.html">File Descriptor Limits</a> (or,
2eaf662cbc81e823e8d9aeb8d54e69e63032493erbowen <li><a href="mass.html">Dynamically Configured Mass Virtual
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><a href="details.html">In-Depth Discussion of Virtual Host
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div><div class="section"><h2><a name="directives" id="directives">Configuration directives</a></h2>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><code class="directive"><a href="/mod/core.html#virtualhost"><VirtualHost></a></code></li>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><code class="directive"><a href="/mod/core.html#namevirtualhost">NameVirtualHost</a></code></li>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><code class="directive"><a href="/mod/core.html#servername">ServerName</a></code></li>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><code class="directive"><a href="/mod/core.html#serveralias">ServerAlias</a></code></li>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess <li><code class="directive"><a href="/mod/core.html#serverpath">ServerPath</a></code></li>
48160cfe05c7614376dc7b1f57f5493eb73f06dbrbowen <p>If you are trying to debug your virtual host configuration, you
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess may find the Apache <code>-t -D DUMP_VHOSTS</code> command line switch
48160cfe05c7614376dc7b1f57f5493eb73f06dbrbowen useful. That is, type the following command:</p>
48160cfe05c7614376dc7b1f57f5493eb73f06dbrbowen <p>This command will dump out a description of how Apache parsed
48160cfe05c7614376dc7b1f57f5493eb73f06dbrbowen the configuration file. Careful examination of the IP addresses and
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess server names may help uncover configuration mistakes. (See <a href="/programs/httpd.html">the docs for the httpd program</a> for
48160cfe05c7614376dc7b1f57f5493eb73f06dbrbowen other command line options)</p>
fefb8b844b6286bfc41bb2e0c4cc003b8e7d4ff2kess</div></div><div id="footer"><p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p><p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="/faq/">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p></div></body></html>