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<?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>Apache IP-based Virtual Host Support - 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 2.0</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/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Virtual Hosts</a></div><div id="page-content"><div id="preamble"><h1>Apache IP-based Virtual Host Support</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/vhosts/ip-based.html" title="English"> en </a> |<a href="../ko/vhosts/ip-based.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p></div></div><div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#requirements">System requirements</a></li><li><img alt="" src="../images/down.gif" /> <a href="#howto">How to set up Apache</a></li><li><img alt="" src="../images/down.gif" /> <a href="#multiple">Setting up multiple daemons</a></li><li><img alt="" src="../images/down.gif" /> <a href="#single">Setting up a single daemon with virtual hosts</a></li></ul><h3>See also</h3><ul class="seealso"><li><a href="name-based.html">Name-based Virtual Hosts Support</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="requirements" id="requirements">System requirements</a></h2> <p>As the term <cite>IP-based</cite> indicates, the server <strong>must have a different IP address for each IP-based virtual host</strong>. This can be achieved by the machine having several physical network connections, or by use of virtual interfaces which are supported by most modern operating systems (see system documentation for details, these are frequently called "ip aliases", and the "ifconfig" command is most commonly used to set them up).</p></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="howto" id="howto">How to set up Apache</a></h2> <p>There are two ways of configuring apache to support multiple hosts. Either by running a separate <code class="program"><a href="../programs/httpd.html">httpd</a></code> daemon for each hostname, or by running a single daemon which supports all the virtual hosts.</p> <p>Use multiple daemons when:</p> <ul> <li>There are security partitioning issues, such as company1 does not want anyone at company2 to be able to read their data except via the web. In this case you would need two daemons, each running with different <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code>, <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code>, <code class="directive"><a href="../mod/mpm_common.html#listen">Listen</a></code>, and <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> settings.</li> <li>You can afford the memory and <a href="../misc/descriptors.html">file descriptor requirements</a> of listening to every IP alias on the machine. It's only possible to <code class="directive"><a href="../mod/mpm_common.html#listen">Listen</a></code> to the "wildcard" address, or to specific addresses. So if you have a need to listen to a specific address for whatever reason, then you will need to listen to all specific addresses. (Although one <code class="program"><a href="../programs/httpd.html">httpd</a></code> could listen to N-1 of the addresses, and another could listen to the remaining address.)</li> </ul> <p>Use a single daemon when:</p> <ul> <li>Sharing of the httpd configuration between virtual hosts is acceptable.</li> <li>The machine services a large number of requests, and so the performance loss in running separate daemons may be significant.</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="multiple" id="multiple">Setting up multiple daemons</a></h2> <p>Create a separate <code class="program"><a href="../programs/httpd.html">httpd</a></code> installation for each virtual host. For each installation, use the <code class="directive"><a href="../mod/mpm_common.html#listen">Listen</a></code> directive in the configuration file to select which IP address (or virtual host) that daemon services. e.g.</p> <div class="example"><p><code> Listen www.smallco.com:80 </code></p></div> <p>It is recommended that you use an IP address instead of a hostname (see <a href="../dns-caveats.html">DNS caveats</a>).</p></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="single" id="single">Setting up a single daemon with virtual hosts</a></h2> <p>For this case, a single httpd will service requests for the main server and all the virtual hosts. The <code class="directive"><a href="../mod/core.html#virtualhost">VirtualHost</a></code> directive in the configuration file is used to set the values of <code class="directive"><a href="../mod/core.html#serveradmin">ServerAdmin</a></code>, <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code>, <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code>, <code class="directive"><a href="../mod/core.html#errorlog">ErrorLog</a></code> and <code class="directive"><a href="../mod/mod_log_config.html#transferlog">TransferLog</a></code> or <code class="directive"><a href="../mod/mod_log_config.html#customlog">CustomLog</a></code> configuration directives to different values for each virtual host. e.g.</p> <div class="example"><p><code> <VirtualHost www.smallco.com><br /> ServerAdmin webmaster@mail.smallco.com<br /> DocumentRoot /groups/smallco/www<br /> ServerName www.smallco.com<br /> ErrorLog /groups/smallco/logs/error_log<br /> TransferLog /groups/smallco/logs/access_log<br /> </VirtualHost><br /> <br /> <VirtualHost www.baygroup.org><br /> ServerAdmin webmaster@mail.baygroup.org<br /> DocumentRoot /groups/baygroup/www<br /> ServerName www.baygroup.org<br /> ErrorLog /groups/baygroup/logs/error_log<br /> TransferLog /groups/baygroup/logs/access_log<br /> </VirtualHost> </code></p></div> <p>It is recommended that you use an IP address instead of a hostname (see <a href="../dns-caveats.html">DNS caveats</a>).</p> <p>Almost <strong>any</strong> configuration directive can be put in the VirtualHost directive, with the exception of directives that control process creation and a few other directives. To find out if a directive can be used in the VirtualHost directive, check the <a href="../mod/directive-dict.html#Context">Context</a> using the <a href="../mod/directives.html">directive index</a>.</p> <p><code class="directive"><a href="../mod/mod_suexec.html#suexecusergroup">SuexecUserGroup</a></code> may be used inside a VirtualHost directive if the <a href="../suexec.html">suEXEC wrapper</a> is used.</p> <p><em>SECURITY:</em> When specifying where to write log files, be aware of some security risks which are present if anyone other than the user that starts Apache has write access to the directory where they are written. See the <a href="../misc/security_tips.html">security tips</a> document for details.</p></div></div><div class="bottomlang"><p><span>Available Languages: </span><a href="../en/vhosts/ip-based.html" title="English"> en </a> |<a href="../ko/vhosts/ip-based.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p></div><div id="footer"><p class="apache">Copyright 2007 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="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div></body></html>⌨️ 快捷键说明
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