github.com/krum110487/go-htaccess@v0.0.0-20240316004156-60641c8e7598/tests/data/apache_2_2_34/manual/vhosts/fd-limits.html.en (about) 1 <?xml version="1.0" encoding="ISO-8859-1"?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3 <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> 4 <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" /> 5 <!-- 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 This file is generated from xml source: DO NOT EDIT 8 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 9 --> 10 <title>File Descriptor Limits - Apache HTTP Server Version 2.2</title> 11 <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 12 <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 13 <link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> 14 <script src="../style/scripts/prettify.min.js" type="text/javascript"> 15 </script> 16 17 <link href="../images/favicon.ico" rel="shortcut icon" /><link href="http://httpd.apache.org/docs/current/vhosts/fd-limits.html" rel="canonical" /></head> 18 <body id="manual-page" class="no-sidebar"><div id="page-header"> 19 <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p> 20 <p class="apache">Apache HTTP Server Version 2.2</p> 21 <img alt="" src="../images/feather.gif" /></div> 22 <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> 23 <div id="path"> 24 <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 2.2</a> > <a href="./">Virtual Hosts</a></div><div id="page-content"><div class="retired"><h4>Please note</h4> 25 <p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p> 26 <p>You may follow <a href="http://httpd.apache.org/docs/current/vhosts/fd-limits.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>File Descriptor Limits</h1> 27 <div class="toplang"> 28 <p><span>Available Languages: </span><a href="../en/vhosts/fd-limits.html" title="English"> en </a> | 29 <a href="../fr/vhosts/fd-limits.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | 30 <a href="../ja/vhosts/fd-limits.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 31 <a href="../ko/vhosts/fd-limits.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | 32 <a href="../tr/vhosts/fd-limits.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p> 33 </div> 34 35 36 <p>When using a large number of Virtual Hosts, Apache may run 37 out of available file descriptors (sometimes called <cite>file 38 handles</cite>) if each Virtual Host specifies different log 39 files. The total number of file descriptors used by Apache is 40 one for each distinct error log file, one for every other log 41 file directive, plus 10-20 for internal use. Unix operating 42 systems limit the number of file descriptors that may be used 43 by a process; the limit is typically 64, and may usually be 44 increased up to a large hard-limit.</p> 45 46 <p>Although Apache attempts to increase the limit as required, 47 this may not work if:</p> 48 49 <ol> 50 <li>Your system does not provide the <code>setrlimit()</code> 51 system call.</li> 52 53 <li>The <code>setrlimit(RLIMIT_NOFILE)</code> call does not 54 function on your system (such as Solaris 2.3)</li> 55 56 <li>The number of file descriptors required exceeds the hard 57 limit.</li> 58 59 <li>Your system imposes other limits on file descriptors, 60 such as a limit on stdio streams only using file descriptors 61 below 256. (Solaris 2)</li> 62 </ol> 63 64 <p>In the event of problems you can:</p> 65 66 <ul> 67 <li>Reduce the number of log files; don't specify log files 68 in the <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> 69 sections, but only log to the main log files. (See <a href="#splitlogs">Splitting up your log files</a>, below, for more 70 information on doing this.)</li> 71 72 <li> 73 If you system falls into 1 or 2 (above), then increase the 74 file descriptor limit before starting Apache, using a 75 script like 76 77 <div class="example"><p><code> 78 <code>#!/bin/sh<br /> 79 ulimit -S -n 100<br /> 80 exec httpd</code> 81 </code></p></div> 82 </li> 83 </ul> 84 85 </div> 86 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> 87 <div class="section"> 88 <h2><a name="splitlogs" id="splitlogs">Splitting up your log files</a></h2> 89 90 <p>If you want to log multiple virtual hosts to the same log file, you 91 may want to split up the log files afterwards in order to run 92 statistical analysis of the various virtual hosts. This can be 93 accomplished in the following manner.</p> 94 95 <p>First, you will need to add the virtual host information to the log 96 entries. This can be done using the <code class="directive"><a href="../mod/mod_log_config.html#logformat"> 97 LogFormat</a></code> 98 directive, and the <code>%v</code> variable. Add this to the beginning 99 of your log format string:</p> 100 101 <div class="example"><p><code> 102 LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost<br /> 103 CustomLog logs/multiple_vhost_log vhost 104 </code></p></div> 105 106 <p>This will create a log file in the common log format, but with the 107 canonical virtual host (whatever appears in the 108 <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> directive) prepended to 109 each line. (See <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code> for 110 more about customizing your log files.)</p> 111 112 <p>When you wish to split your log file into its component parts (one 113 file per virtual host) you can use the program <code><a href="../programs/other.html">split-logfile</a></code> to accomplish 114 this. You'll find this program in the <code>support</code> directory 115 of the Apache distribution.</p> 116 117 <p>Run this program with the command:</p> 118 119 <div class="example"><p><code> 120 split-logfile < /logs/multiple_vhost_log 121 </code></p></div> 122 123 <p>This program, when run with the name of your vhost log file, will 124 generate one file for each virtual host that appears in your log file. 125 Each file will be called <code>hostname.log</code>.</p> 126 127 </div></div> 128 <div class="bottomlang"> 129 <p><span>Available Languages: </span><a href="../en/vhosts/fd-limits.html" title="English"> en </a> | 130 <a href="../fr/vhosts/fd-limits.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | 131 <a href="../ja/vhosts/fd-limits.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 132 <a href="../ko/vhosts/fd-limits.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | 133 <a href="../tr/vhosts/fd-limits.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p> 134 </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. 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