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How to create a debug log
=========================
Creating a debug log is actually quite simple. You just have to add a
few lines to the configuration file.
Regular debug output
--------------------
Add the following right at the beginning of the rsyslog.conf file. This
will ensure that debug support is the first thing to enable when the
rsyslog service is started:
::
$DebugFile /var/log/rsyslog.debug
$DebugLevel 2
The actual file path and name may be changed if required.
Having set the above, when rsyslog is restarted it will produce a continuous
debug file.
Debug on Demand
---------------
For having rsyslog be ready to create a debug log (aka Debug on Demand), the
settings are a little different.
::
$DebugFile /var/log/rsyslog.debug
$DebugLevel 1
Now, rsyslog will not create a debug log on restart, but wait for a USR signal
to the pid. When sent, the debug output will be triggered. When sent again,
debug output will be stopped.
::
kill -USR1 `cat /var/run/rsyslogd.pid`
Notes
-----
- Having debug output enabled, the debug file will grow very quickly. Make sure
to not have it enabled permanently. The file will eventually fill up the disk.
- Debug mode is not to be used in a productive environment as a permanent setting.
It will affect the processing and performance.
See Also
--------
- :doc:`Troubleshooting <../troubleshooting/troubleshoot>` doc page.
- :doc:`Debug Support<../troubleshooting/debug>` doc page with more detailed
information.
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