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60 lines
2.0 KiB
Plaintext
60 lines
2.0 KiB
Plaintext
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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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
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">File Descriptor Limits</H1>
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<P>
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When using a large number of Virtual Hosts, Apache may run out of available
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file descriptors (sometimes called <CITE>file handles</CITE> if each Virtual
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Host specifies different log files.
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The total number of file descriptors used by Apache is one for each distinct
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error log file, one for every other log file directive, plus 10-20 for
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internal use. Unix operating systems limit the number of file descriptors that
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may be used by a process; the limit is typically 64, and may usually be
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increased up to a large hard-limit.
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<P>
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Although Apache attempts to increase the limit as required, this
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may not work if:
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<OL>
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<LI>Your system does not provide the setrlimit() system call.
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<LI>The setrlimit(RLIMIT_NOFILE) call does not function on your system
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(such as Solaris 2.3)
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<LI>The number of file descriptors required exceeds the hard limit.
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<LI>Your system imposes other limits on file descriptors, such as a limit
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on stdio streams only using file descriptors below 256. (Solaris 2)
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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 in the VirtualHost
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sections, but only log to the main log files.
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<LI>If you system falls into 1 or 2 (above), then increase the file descriptor
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limit before starting Apache, using a script like
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<BLOCKQUOTE><CODE>
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#!/bin/sh <BR>
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ulimit -S -n 100 <BR>
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exec httpd</CODE></BLOCKQUOTE>
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</UL>
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<P>
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Please see the
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<A HREF="../misc/descriptors.html">Descriptors and Apache</A>
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document containing further details about file descriptor problems and how
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they can be solved on your operating system.
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</P>
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<!--#include virtual="footer.html" -->
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</BODY></HTML>
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