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126 lines
6.6 KiB
XML
126 lines
6.6 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>File Descriptor Limits - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body id="manual-page" class="no-sidebar"><div id="page-header">
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<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>
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<p class="apache">Apache HTTP Server Version 2.1</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<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> > <a href="./">Virtual Hosts</a></div><div id="page-content"><div id="preamble"><h1>File Descriptor Limits</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/vhosts/fd-limits.html" title="English"> en </a> |
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<a href="../ja/vhosts/fd-limits.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/vhosts/fd-limits.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div>
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<p>When using a large number of Virtual Hosts, Apache may run
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out of available file descriptors (sometimes called <cite>file
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handles</cite>) if each Virtual Host specifies different log
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files. The total number of file descriptors used by Apache is
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one for each distinct error log file, one for every other log
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file directive, plus 10-20 for internal use. Unix operating
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systems limit the number of file descriptors that may be used
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by a process; the limit is typically 64, and may usually be
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increased up to a large hard-limit.</p>
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<p>Although Apache attempts to increase the limit as required,
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this may not work if:</p>
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<ol>
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<li>Your system does not provide the <code>setrlimit()</code>
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system call.</li>
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<li>The <code>setrlimit(RLIMIT_NOFILE)</code> call does not
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function on your system (such as Solaris 2.3)</li>
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<li>The number of file descriptors required exceeds the hard
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limit.</li>
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<li>Your system imposes other limits on file descriptors,
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such as a limit on stdio streams only using file descriptors
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below 256. (Solaris 2)</li>
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</ol>
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<p>In the event of problems you can:</p>
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<ul>
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<li>Reduce the number of log files; don't specify log files
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in the <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>
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sections, but only log to the main log files. (See <a href="#splitlogs">Splitting up your log files</a>, below, for more
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information on doing this.)</li>
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<li>
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If you system falls into 1 or 2 (above), then increase the
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file descriptor limit before starting Apache, using a
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script like
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<div class="example"><p><code>
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<code>#!/bin/sh<br />
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ulimit -S -n 100<br />
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exec httpd</code>
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</code></p></div>
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</li>
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</ul>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="splitlogs" id="splitlogs">Splitting up your log files</a></h2>
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<p>If you want to log multiple virtual hosts to the same log file, you
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may want to split up the log files afterwards in order to run
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statistical analysis of the various virtual hosts. This can be
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accomplished in the following manner.</p>
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<p>First, you will need to add the virtual host information to the log
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entries. This can be done using the <code class="directive"><a href="../mod/mod_log_config.html# logformat">
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LogFormat</a></code>
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directive, and the <code>%v</code> variable. Add this to the beginning
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of your log format string:</p>
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<div class="example"><p><code>
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LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost<br />
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CustomLog logs/multiple_vhost_log vhost
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</code></p></div>
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<p>This will create a log file in the common log format, but with the
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canonical virtual host (whatever appears in the
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<code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> directive) prepended to
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each line. (See <code class="directive"><a href="../mod/mod_log_config.html#custom log formats">Custom Log Formats</a></code> for
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more about customizing your log files.)</p>
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<p>When you wish to split your log file into its component parts (one
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file per virtual host) you can use the program <code><a href="../programs/other.html">split-logfile</a></code> to accomplish
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this. You'll find this program in the <code>support</code> directory
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of the Apache distribution.</p>
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<p>Run this program with the command:</p>
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<div class="example"><p><code>
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split-logfile < /logs/multiple_vhost_log
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</code></p></div>
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<p>This program, when run with the name of your vhost log file, will
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generate one file for each virtual host that appears in your log file.
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Each file will be called <code>hostname.log</code>.</p>
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</div></div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/vhosts/fd-limits.html" title="English"> en </a> |
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<a href="../ja/vhosts/fd-limits.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/vhosts/fd-limits.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 1999-2004 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>
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<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>
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</body></html> |