| <?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> |
| <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" /> |
| <meta content="noindex, nofollow" name="robots" /> |
| <!-- |
| 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" /><link href="http://httpd.apache.org/docs/current/vhosts/fd-limits.html" rel="canonical" /></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 class="retired"><h4>Please note</h4> |
| <p>This document refers to the <strong>2.0</strong> version of Apache httpd, which <strong>is no longer maintained</strong>. Upgrade, and refer to the current version of httpd instead, documented at:</p> |
| <ul><li><a href="http://httpd.apache.org/docs/current/">Current release version of Apache HTTP Server documentation</a></li></ul><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> |
| <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> | |
| <a href="../tr/vhosts/fd-limits.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </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, you |
| may want to split up the log files afterwards in order to run |
| statistical analysis of the various virtual hosts. This can be |
| accomplished in the following manner.</p> |
| |
| <p>First, you will need to add the virtual host information to the log |
| entries. 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 beginning |
| of 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 the |
| canonical virtual host (whatever appears in the |
| <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> directive) prepended to |
| each line. (See <code class="directive"><a href="../mod/mod_log_config.html#custom log formats">Custom Log Formats</a></code> for |
| more about customizing your log files.)</p> |
| |
| <p>When you wish to split your log file into its component parts (one |
| file per virtual host) you can use the program <code><a href="../programs/other.html">split-logfile</a></code> to accomplish |
| this. You'll find this program in the <code>support</code> directory |
| of 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, will |
| generate 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> | |
| <a href="../tr/vhosts/fd-limits.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p> |
| </div><div id="footer"> |
| <p class="apache">Copyright 2013 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> |