mirror of
https://github.com/apache/httpd.git
synced 2025-10-24 10:53:08 +03:00
9eeb27d893
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96196 13f79535-47bb-0310-9956-ffa450edef68
119 lines
4.4 KiB
Plaintext
119 lines
4.4 KiB
Plaintext
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta name="generator" content="HTML Tidy, see www.w3.org" />
|
|
|
|
<title>Apache Server Virtual Host Support</title>
|
|
</head>
|
|
<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
|
|
|
|
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
|
|
vlink="#000080" alink="#FF0000">
|
|
<!--#include virtual="header.html" -->
|
|
|
|
<h1 align="center">File Descriptor Limits</h1>
|
|
|
|
<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>
|
|
In the event of problems you can:
|
|
|
|
<ul>
|
|
<li>Reduce the number of log files; don't specify log files
|
|
in the <code><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
|
|
|
|
<blockquote>
|
|
<code>#!/bin/sh<br />
|
|
ulimit -S -n 100<br />
|
|
exec httpd</code>
|
|
</blockquote>
|
|
</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>
|
|
|
|
<h2><a name="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><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>
|
|
|
|
<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
|
|
LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost<br />
|
|
CustomLog logs/multiple_vhost_log vhost
|
|
</code></td></tr></table></blockquote>
|
|
|
|
<p>This will create a log file in the common log format, but with the
|
|
canonical virtual host (whatever appears in the
|
|
<a href="../mod/core.html#servername">ServerName</a> directive) prepended to
|
|
each line. (See <a
|
|
href="../mod/mod_log_config.html#formats">Custom Log Formats</a> 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 disribution.</p>
|
|
|
|
<p>Run this program with the command:</p>
|
|
|
|
<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee">
|
|
<code>split-logfile < /logs/multiple_vhost_log</code>
|
|
</td></tr></table></blockquote>
|
|
|
|
<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>
|
|
|
|
<!--#include virtual="footer.html" -->
|
|
</body>
|
|
</html>
|
|
|