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15 <p class="apache">Apache HTTP Server Version 2.0</p>
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19 <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 id="preamble"><h1>File Descriptor Limits</h1>
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28 <p>When using a large number of Virtual Hosts, Apache may run
29 out of available file descriptors (sometimes called <cite>file
30 handles</cite>) if each Virtual Host specifies different log
31 files. The total number of file descriptors used by Apache is
32 one for each distinct error log file, one for every other log
33 file directive, plus 10-20 for internal use. Unix operating
34 systems limit the number of file descriptors that may be used
35 by a process; the limit is typically 64, and may usually be
36 increased up to a large hard-limit.</p>
38 <p>Although Apache attempts to increase the limit as required,
39 this may not work if:</p>
42 <li>Your system does not provide the <code>setrlimit()</code>
45 <li>The <code>setrlimit(RLIMIT_NOFILE)</code> call does not
46 function on your system (such as Solaris 2.3)</li>
48 <li>The number of file descriptors required exceeds the hard
51 <li>Your system imposes other limits on file descriptors,
52 such as a limit on stdio streams only using file descriptors
53 below 256. (Solaris 2)</li>
56 <p>In the event of problems you can:</p>
59 <li>Reduce the number of log files; don't specify log files
60 in the <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>
61 sections, but only log to the main log files. (See <a href="#splitlogs">Splitting up your log files</a>, below, for more
62 information on doing this.)</li>
65 If you system falls into 1 or 2 (above), then increase the
66 file descriptor limit before starting Apache, using a
69 <div class="example"><p><code>
71 ulimit -S -n 100<br />
77 <p>Please see the <a href="../misc/descriptors.html">Descriptors and Apache</a>
78 document containing further details about file descriptor
79 problems and how they can be solved on your operating
83 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
85 <h2><a name="splitlogs" id="splitlogs">Splitting up your log files</a></h2>
87 <p>If you want to log multiple virtual hosts to the same log file, you
88 may want to split up the log files afterwards in order to run
89 statistical analysis of the various virtual hosts. This can be
90 accomplished in the following manner.</p>
92 <p>First, you will need to add the virtual host information to the log
93 entries. This can be done using the <code class="directive"><a href="../mod/mod_log_config.html# logformat">
95 directive, and the <code>%v</code> variable. Add this to the beginning
96 of your log format string:</p>
98 <div class="example"><p><code>
99 LogFormat "%v %h %l %u %t \"%r\" %>s %b" vhost<br />
100 CustomLog logs/multiple_vhost_log vhost
103 <p>This will create a log file in the common log format, but with the
104 canonical virtual host (whatever appears in the
105 <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> directive) prepended to
106 each line. (See <code class="directive"><a href="../mod/mod_log_config.html#custom log formats">Custom Log Formats</a></code> for
107 more about customizing your log files.)</p>
109 <p>When you wish to split your log file into its component parts (one
110 file per virtual host) you can use the program <code><a href="../programs/other.html">split-logfile</a></code> to accomplish
111 this. You'll find this program in the <code>support</code> directory
112 of the Apache distribution.</p>
114 <p>Run this program with the command:</p>
116 <div class="example"><p><code>
117 split-logfile < /logs/multiple_vhost_log
120 <p>This program, when run with the name of your vhost log file, will
121 generate one file for each virtual host that appears in your log file.
122 Each file will be called <code>hostname.log</code>.</p>
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