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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>File Descriptor Limits - 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" class="no-sidebar"><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>File Descriptor Limits</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/vhosts/fd-limits.html" title="English"> en </a> |<a href="../ja/vhosts/fd-limits.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |<a href="../ko/vhosts/fd-limits.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p></div> <p>When using a large number of Virtual Hosts, Apache may run out of available file descriptors (sometimes called <cite>file handles</cite>) if each Virtual Host specifies different log files. The total number of file descriptors used by Apache is one for each distinct error log file, one for every other log file directive, plus 10-20 for internal use. Unix operating systems limit the number of file descriptors that may be used by a process; the limit is typically 64, and may usually be increased up to a large hard-limit.</p> <p>Although Apache attempts to increase the limit as required, this may not work if:</p> <ol> <li>Your system does not provide the <code>setrlimit()</code> system call.</li> <li>The <code>setrlimit(RLIMIT_NOFILE)</code> call does not function on your system (such as Solaris 2.3)</li> <li>The number of file descriptors required exceeds the hard limit.</li> <li>Your system imposes other limits on file descriptors, such as a limit on stdio streams only using file descriptors below 256. (Solaris 2)</li> </ol> <p>In the event of problems you can:</p> <ul> <li>Reduce the number of log files; don't specify log files in the <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> sections, but only log to the main log files. (See <a href="#splitlogs">Splitting up your log files</a>, below, for more information on doing this.)</li> <li> If you system falls into 1 or 2 (above), then increase the file descriptor limit before starting Apache, using a script like <div class="example"><p><code> <code>#!/bin/sh<br /> ulimit -S -n 100<br /> exec httpd</code> </code></p></div> </li> </ul> <p>Please see the <a href="../misc/descriptors.html">Descriptors and Apache</a> document containing further details about file descriptor problems and how they can be solved on your operating system.</p></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="splitlogs" id="splitlogs">Splitting up your log files</a></h2><p>If you want to log multiple virtual hosts to the same log file, youmay want to split up the log files afterwards in order to runstatistical analysis of the various virtual hosts. This can beaccomplished in the following manner.</p><p>First, you will need to add the virtual host information to the logentries. This can be done using the <code class="directive"><a href="../mod/mod_log_config.html# logformat">LogFormat</a></code>directive, and the <code>%v</code> variable. Add this to the beginningof your log format string:</p><div class="example"><p><code>LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost<br />CustomLog logs/multiple_vhost_log vhost</code></p></div><p>This will create a log file in the common log format, but with thecanonical virtual host (whatever appears in the<code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> directive) prepended toeach line. (See <code class="directive"><a href="../mod/mod_log_config.html#custom log formats">Custom Log Formats</a></code> formore about customizing your log files.)</p><p>When you wish to split your log file into its component parts (onefile per virtual host) you can use the program <code><a href="../programs/other.html">split-logfile</a></code> to accomplishthis. You'll find this program in the <code>support</code> directoryof the Apache distribution.</p><p>Run this program with the command:</p><div class="example"><p><code>split-logfile < /logs/multiple_vhost_log</code></p></div><p>This program, when run with the name of your vhost log file, willgenerate one file for each virtual host that appears in your log file.Each file will be called <code>hostname.log</code>.</p></div></div><div class="bottomlang"><p><span>Available Languages: </span><a href="../en/vhosts/fd-limits.html" title="English"> en </a> |<a href="../ja/vhosts/fd-limits.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |<a href="../ko/vhosts/fd-limits.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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