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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
-<HTML>
-<HEAD>
-<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>
-Although Apache attempts to increase the limit as required, this
-may not work if:
-<OL>
-<LI>Your system does not provide the setrlimit() system call.
-<LI>The setrlimit(RLIMIT_NOFILE) call does not function on your system
- (such as Solaris 2.3)
-<LI>The number of file descriptors required exceeds the hard limit.
-<LI>Your system imposes other limits on file descriptors, such as a limit
-on stdio streams only using file descriptors below 256. (Solaris 2)
-</OL>
-
-In the event of problems you can:
-<UL>
-<LI>Reduce the number of log files; don't specify log files in the VirtualHost
-sections, but only log to the main log files.
-<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>
-</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>
-
-<!--#include virtual="footer.html" -->
-</BODY></HTML>
-