Use this documentation with care! It describes the outdated version 7, which was actively developed around 2014 and is considered dead by the rsyslog team.

This documentation reflects the latest update of the v7-stable branch. It describes the 7.6.8 version, which was never released. As such, it contains some content that does not apply to any released version.

To obtain the doc that properly matches your installed v7 version, obtain the doc set from your distro. Each version of rsyslog contained the version that exactly matches it.

As general advise, it is strongly suggested to upgrade to the current version supported by the rsyslog project. The current version can always be found on the right-hand side info box on the rsyslog web site.

Note that there is only limited rsyslog community support available for the outdated v7 version (officially we do not support it at all, but we usually are able to answer simple questions). If you need to stick with v7, it probably is best to ask your distribution for support.

imkmsg: /dev/kmsg Log Input Module

Module Name:    imkmsg

Authors:Rainer Gerhards <>
Milan Bartos <>


Reads messages from the /dev/kmsg structured kernel log and submits them to the syslog engine.

The printk log buffer contains log records. These records are exported by /dev/kmsg device as structured data in the following format: “level,sequnum,timestamp;<message text>\n” There could be continuation lines starting with space that contains key/value pairs. Log messages are parsed as necessary into rsyslog msg_t structure. Continuation lines are parsed as json key/value pairs and added into rsyslog’s message json representation.

Configuration Directives:

This module has no configuration directives.

Caveats/Known Bugs:

This module can’t be used together with imklog module. When using one of them, make sure the other one is not enabled.

This is Linux specific module and requires /dev/kmsg device with structured kernel logs.


The following sample pulls messages from the /dev/kmsg log device. All parameters are left by default, which is usually a good idea. Please note that loading the plugin is sufficient to activate it. No directive is needed to start pulling messages.

$ModLoad imkmsg

[rsyslog.conf overview] [manual index] [rsyslog site]

This documentation is part of the rsyslog project. Copyright © 2008-2009 by Rainer Gerhards and Adiscon. Released under the GNU GPL version 3 or higher.