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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91116 13f79535-47bb-0310-9956-ffa450edef68
74 lines
2.5 KiB
Plaintext
74 lines
2.5 KiB
Plaintext
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>Apache Server Virtual Host Support</title>
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</head>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
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vlink="#000080" alink="#FF0000">
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<!--#include virtual="header.html" -->
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<h1 align="CENTER">File Descriptor Limits</h1>
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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 setrlimit() system
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call.</li>
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<li>The setrlimit(RLIMIT_NOFILE) call does not function on
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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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In the event of problems you can:
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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 VirtualHost sections, but only log to the main log
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files.</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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<blockquote>
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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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</blockquote>
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</li>
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</ul>
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<p>Please see the <a
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href="../misc/descriptors.html">Descriptors and Apache</a>
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document containing further details about file descriptor
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problems and how they can be solved on your operating
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system.</p>
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<!--#include virtual="footer.html" -->
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</body>
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</html>
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