log & audit file to truncate from top

[zaji_nms]

Dear Experts

While checking found /var/log/mrtg.log is more than 5GB.

Also found same way /usr/local/nagvis/var/nagvis-audit.log (more than 17GB)

We do not want very old log (more than year or 6 months).

Please let us know any other such log files, we can truncate manually.

Please let us know how to truncate from top (need to remove old log)?
Is it safe to removed old log from this file?
No any adverse effect?

Regards

[Box293]

What version of Nagios XI are you running?

Normally mrtg does not create a /var/log/mrtg.cfg file. Can you please run these commands and post the output:

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cat /etc/cron.d/mrtg

cat /etc/mrtg/mrtg.cfg

This should help identify why the file is being created. It is safe to delete, we just need to find out how it's being created.

As for NagVis, please refer to the config file /usr/local/nagvis/etc/nagvis.ini.php
I believe the setting you need is

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audit_log=0

This will turn off the audit logging.
I could not see an option for log rotation or max log size. I suggest you look at the NagVis support options available http://www.nagvis.org/free-support

If you want to remove the start of a file, simply tail the last x lines of the file to a new file, delete the old file and rename the new file.

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tail -n 1000 /usr/local/nagvis/var/nagvis-audit.log > /usr/local/nagvis/var/nagvis-audit.log.new
rm -f /usr/local/nagvis/var/nagvis-audit.log
mv /usr/local/nagvis/var/nagvis-audit.log.new /usr/local/nagvis/var/nagvis-audit.log

Is it safe to removed old log from this file?

Yes.

No any adverse effect?

You will no longer have access to the old contents once you remove them.

[zaji_nms]

Thanks Mr.Troy for the reply and guidance.

Yes we still using /etc/mrtg/mrtg.cfg as we manually adding MRTG.

You can close the case.

Regards