Nagios Support Forum

Hello Everyone

I continue to explore Nagios and its plugins. I am trying to get a network switch port monitored for bandwidth using check_mrtgtraf. I am working off of this tutorial:

http://www.thegeekstuff.com/2008/11/how ... ng-nagios/

define service{
use generic-service
host_name core-switch
service_description Port 1 Bandwidth Usage
check_command check_local_mrtgtraf!/var/lib/mrtg/192.168.1.11_1.log!AVG!1000000,2000000!5000000,5000000!10
}

I ran into the issue mentioned in the tutorial

Issue1: Nagios GUI displays “check_mrtgtraf: Unable to open MRTG log file” error message for the Port bandwidth usage

Solution1: make sure the *.log file defined in the check_local_mrtgtraf service is pointing to the correct location.

I did not have MRTG installed and used another howto to install and configure it. I also created the log file by touch <ipaddress>_1.log command and for testing purposes have given 777 permissions on the file. With that the error message changed from 'Unable to open MRTG log file' I now that 'check_mrtgtraf: Unable to process MRTG log file'.

I continue to read online but can't seem to find a solution. Does anyone here know what might be the issue and a possible solution?

Many thanks for your time.

This will only work if your cron you setup looks something like this

Hi scottwilkerson

Thank you for replying.

I have run:
crontab -e

and have added the code you provided with my own ip ... however, I still see the same error.

I am a bit confused as to why it needs to run as a cron job for monitoring bandwidth through Nagios, whereas for the rest of uptime, ping test, etc are done through Nagios without setting up a cron job.

Do you know?

Thanks.

Anyone with any ideas on this? Many Thanks!

Hi happy,

I had the same issue.

When I set this up I used the post 10 or so on the following link - http://www.howtoforge.com/forums/archiv ... 48484.html

There were a few things I changed when running the command to create the config directory (/var/www/mrtg/ instead of /var/www/html/mymrtg) but whatever changes you make, ensure to change the rest of the post accordingly.

Hope this helps.

Kind Regards,

Gary Shergill

Thank you for the insight gshergill! We will see what happens.