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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en">
<title>UDP Syslog Input Module (imudp)</title>
</head>
<body>
<a href="rsyslog_conf_modules.html">back to rsyslog module overview</a>
<h1>UDP Syslog Input Module</h1>
<p><b>Module Name: imudp</b></p>
<p><b>Author: </b>Rainer Gerhards <rgerhards@adiscon.com></p>
<p><b>Multi-Ruleset Support: </b>since 5.3.2
<p><b>Description</b>:</p>
<p>Provides the ability to receive syslog messages via UDP.
<p>Multiple receivers may be configured by specifying
$UDPServerRun multiple times.
</p>
<p><b>Configuration Directives</b>:</p>
<ul>
<li>$UDPServerAddress <IP><br>
local IP address (or name) the UDP listens should bind to</li>
<li>$UDPServerRun <port><br>
former -r<port> option, default 514, start UDP server on this
port, "*" means all addresses</li>
<li>$UDPServerTimeRequery <nbr-of-times><br>
this is a performance
optimization. Getting the system time is very costly. With this setting, imudp can
be instructed to obtain the precise time only once every n-times. This logic is
only activated if messages come in at a very fast rate, so doing less frequent
time calls should usually be acceptable. The default value is two, because we have
seen that even without optimization the kernel often returns twice the identical time.
You can set this value as high as you like, but do so at your own risk. The higher
the value, the less precise the timestamp.
<li>$InputUDPServerBindRuleset <ruleset><br>
Binds the listener to a specific <a href="multi_ruleset.html">ruleset</a>.</li>
<li>$IMUDPSchedulingPolicy <rr/fifo/other><br>
Can be used the set the scheduler priority, if the necessary functionality
is provided by the platform. Most useful to select "fifo" for real-time
processing under Linux (and thus reduce chance of packet loss). Available since 4.7.4+, 5.7.3+, 6.1.3+.
<li>$IMUDPSchedulingPriority <number><br>
Scheduling priority to use. Available since 4.7.4+, 5.7.3+, 6.1.3+.
</ul>
<b>Caveats/Known Bugs:</b>
<ul>
<li>currently none known</li>
</ul>
<p><b>Sample:</b></p>
<p>This sets up an UPD server on port 514:<br>
</p>
<textarea rows="15" cols="60">$ModLoad imudp # needs to be done just once
$UDPServerRun 514
</textarea>
<p>[<a href="rsyslog_conf.html">rsyslog.conf overview</a>]
[<a href="manual.html">manual index</a>] [<a href="http://www.rsyslog.com/">rsyslog site</a>]</p>
<p><font size="2">This documentation is part of the
<a href="http://www.rsyslog.com/">rsyslog</a>
project.<br>
Copyright © 2009 by <a href="http://www.gerhards.net/rainer">Rainer
Gerhards</a> and
<a href="http://www.adiscon.com/">Adiscon</a>.
Released under the GNU GPL version 3 or higher.</font></p>
</body></html>
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