check_mrtgtraf: Unable to open MRTG log file

[kheimbuch]

falko- No I had tried that already and it did not work... Thanks for the suggestion though.

Gads - This worked out for me as well. The only thing I had to do was modify some of the file location paths. Since I am monitoring multiple switches I had to modify some things.

Using the "env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg" command would not work for multiple switches. I had to change the output to look something like this "env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg_252.cfg". This was done for each switch so that I knew which output file to point the nagios check_mrtgtraf command to in the switch.cfg file.

I also had to make the appropriate change within the crontab file as well. Other wise it would not update that file and it would give the error "MRTG data has expired".

Only thing I have noticed is that the output files from mrtg only list ports that are listed as being up. Well I shouldn't say that, they are in the log file but are commented out so in nagios it will still show the error: "check_mrtgtraf: Unable to open MRTG log file". Once something is plugged into the port it will start reading the bandwidth once it refreshes.

Awesome job figuring this out gads.

[chiragvaidya]

Hi,

i m making graph for my 2950 cisco switch, i can able to get data but still graphs not getting generated. here im attaching some screenshots so taht u can help me better.

[RAYNM3N]

Hi!


No need to have a different config file for every switch.
Just append the following configs to the same mrtg.conf file and then point to the ip_port on Nagios.
There is also no need to extra add any line in crontab.

Hope this helped!

[RAYNM3N]

Hi!

I have written a reply - at the bottom of all messages - in response to your message.
I hope that will help you get rid on some extra work.

Cheers.

[ilyar]

Hello All!

I need some help. I followed gads instructions and still receiving the error: check_mrtgtraf: Unable to open MRTG log file

I don't understand what is going on at this point. Please help. I checked the following:

The html file works
http://10.0.1.85/mymrtg/10.0.1.1_2.html

The switch.cfg is configured
define service{
use generic-service ; Inherit values from a template
host_name Router_San_Rafael
service_description Port 2 Bandwidth Usage
check_command check_local_mrtgtraf!/var/www/html/mymrtg/10.0.1.1_2.log!AVG!1000000,1000000!5000000,5000000 !10
}

The commands.cfg is configured
# 'check_local_mrtgtraf' command definition
define command{
command_name check_local_mrtgtraf
command_line $USER1$/check_mrtgtraf -F $LOGFILE$ -a $ARG1$ -w $ARG3$ -c $ARG4$ -e $ARG5$
}

[Mark_NL]

What output does this command give you?

ls -al /var/www/html/mymrtg/10.0.1.1_2.log

[ilyar]

Originally Posted by Mark_NL

What output does this command give you?

ls -al /var/www/html/mymrtg/10.0.1.1_2.log

-rw-r--r--. 1 root root 55171 Nov 21 09:40 /var/www/html/mymrtg/10.0.1.1_2.log

[Mark_NL]

What happens when you run the check command from a shell:

/usr/lib/nagios/plugins/check_local_mrtgtraf -F /var/www/html/mymrtg/10.0.1.1_2.log -a AVG -w 1000000,1000000 -c 5000000,5000000 -e 10

[ilyar]

Originally Posted by Mark_NL

What happens when you run the check command from a shell:

/usr/lib/nagios/plugins/check_local_mrtgtraf -F /var/www/html/mymrtg/10.0.1.1_2.log -a AVG -w 1000000,1000000 -c 5000000,5000000 -e 10

after I run this i get:

-bash: /usr/lib/nagios/plugins/check_local_mrtgtraf: No such file or directory

by the way when i installed nagios i ran this command:

yum install nagios nagios-devel nagios-plugins* gd gd-devel httpd php gcc glibc glibc-common

so i am not sure where the plugins are located if they were installed. i believe my nagios is installed in /etc/nagios but i don't see a plugins directory there.

thanks.

[Mark_NL]

ow damn, the command is wrong, should be "check_mrtgtraf"

try to cd into /usr/lib/nagios/plugins, does that dir exist?

find your nagios plugin dir (should be defined in your nagios config somewhere)
then correct the command to reflect the correct location and run it.