UDP Syslog Input Module

Module Name: imudp

Author: Rainer Gerhards <rgerhards@adiscon.com>

Multi-Ruleset Support: since 5.3.2

Description:

Provides the ability to receive syslog messages via UDP.

Multiple receivers may be configured by specifying $UDPServerRun multiple times.

Configuration Directives:

$UDPServerAddress <IP>
local IP address (or name) the UDP listens should bind to
$UDPServerRun <port>
former -r<port> option, default 514, start UDP server on this port, "*" means all addresses
$UDPServerTimeRequery <nbr-of-times>
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.
$InputUDPServerBindRuleset <ruleset>
Binds the listener to a specific ruleset.
$IMUDPSchedulingPolicy <rr/fifo/other>
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+.
$IMUDPSchedulingPriority <number>
Scheduling priority to use. Available since 4.7.4+, 5.7.3+, 6.1.3+.

Caveats/Known Bugs:

Sample:

This sets up an UPD server on port 514: