check_mrtgtraf: Unable to open MRTG log file

hi, I have installed nagios on centOS and I monitor switch but the Port1 Bandwidth Usage has this error "check_mrtgtraf: Unable to open MRTG log file ". I had already installed mrtg but it has the same error.
do anyone can help me about this problem? thanks in advance...

here is the script of my switch.cfg:

define service{
use generic-service ; Inherit values from a template
host_name distributed_switch
service_description Port 1 Bandwidth Usage
check_command check_local_mrtgtraf!/var/lib/mrtg/192.168.1.253_1.log!AVG!1000000,1000000!5000000,5000000!10
}

 

Code:

ls -al /var/lib/mrtg/192.168.1.253_1.log

Code:

ps flax | grep nagios

 

thanks for the reply Mark_NL, when I try the code you gave this is the result:

[root@localhost ~]# ls -al /var/lib/mrtg/192.168.1.253_1.log
ls: /var/lib/mrtg/192.168.1.253_1.log: No such file or directory
[root@localhost ~]# ps flax | grep nagios
0 0 18909 12276 17 0 3916 664 stext S+ pts/0 0:00 | \_ grep nagios
1 100 2860 1 18 0 6780 484 335550 Ss ? 0:00 /usr/sbin/ndo2db -c /etc/nagios/ndo2db.cfg
1 100 16191 2860 15 0 6780 1268 - S ? 0:01 \_ /usr/sbin/ndo2db -c /etc/nagios/ndo2db.cfg
1 100 16188 1 15 0 13716 984 stext Ssl ? 0:00 /usr/bin/nagios -d /etc/nagios/nagios.cfg

I wonder what is 192.168.1.253_1.log because when i go to /var/lib/mrtg/ directory, it is not there? what should i do about this?

thanks in advance..

 

what IS in that mrtg dir?

Code:

ls -al /var/lib/mrtg/

 

Hey Mark I am having the same problem as Gads. The only file I have in the /var/lib/mrtg/ directory is:

_etc_mrtg.cfg

 

hi Mark, thanks for the reply, sorry for the late response... here is the result of the command " ls -al /var/lib/mrtg/ " :

[root@localhost ~]# ls -al /var/lib/mrtg/
total 12
drwxr-xr-x 2 root root 4096 Jan 10 2007 .
drwxrwxr-x 22 apache nagios 4096 Sep 1 13:21 ..
-rw-r--r-- 1 nagios nagios 0 Sep 3 10:15 mrtg.ok
[root@localhost ~]#

what should I do next? thanks in advance...

 

Can you try

Code:

chown nagios:nagios /var/lib/mrtg/

?

 

Nothing for me. Still the same error. I had even tried creating the file itself and giving nagios full access to it.

 

Does a

Code:

chmod 777 /var/lib/mrtg/

work?

 

hi, i have solved this problem, this is the things that i did:

Install MRTG:
To monitor bandwidth usages of router/switch you must have mrtg installed on system. Before installation please make sure you have install gd, libpng, zlib packages.

1. Download MRTG using yum install mrtg

2. Now you need not to create mrtg configuration file. Use cfgmaker.
cfgmaker --global 'WorkDir: /var/www/html/mymrtg' --global 'Options[_]: bits,growright' --output /etc/httpd/conf/mrtg.cfg public@<ip address of the switch>
6. Go to respective location and make sure that above command has created respective files.
cd /var/www/html/mrtg;
ls -al /etc/httpd/conf/mrtg.cfg

7. Run this command to update mrtg log file.
env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg


10. Set cron to run above command every 5 minute.
crontab -e

11. insert the code below and save,
*/5 * * * * /usr/bin/env LANG=C /usr/bin/mrtg /etc/mrtg/mymrtg.cfg –logging /var/log/mrtg.log
*/5 * * * * /usr/bin/env LANG=C /usr/bin/mrtg /etc/httpd/conf/mrtg.cfg --logging /var/log/mrtg.log

12. Restart cron service.
/etc/init.d/crond restart

13. Confirm that it is been configured.
http://localhost/mymrtg/{name of html file}

Actually when you run mrtg command it searches for respective router community collects all data from router. Accordingly it creates log file. Like in my case it has found port 2 running on router and hence created file 172.17.42.22_2.log, 172.17.42.22_2.html. So I can access my graph through this link,
http://localhost/mymrtg/<ip address of the switch>_2.html

Procedure to monitor Bandwidth Usages in Nagios:
1. Default installation directory of nagios is /usr/local/nagios/.

2. Open switch.cfg file
nano /etc/nagios/objects/switch.cfg

3. Make changes according to your router specifications. Like,
define host{
use generic-switch
host_name Router_1
alias Router 1
address 172.17.42.22
hostgroups switches
}
4. You can also set PING, Uptime, Ports Link Status etc.
define service{
use generic-service ; Inherit values from a template
host_name Router_1 ; The name of the host the service is associated with
service_description PING ; The service description
check_command check_ping!200.0,20%!600.0,60% ; The command used to monitor the service
normal_check_interval 5 ; Check the service every 5 minutes under normal conditions
retry_check_interval 1 ; Re-check the service every minute until its final/hard state is determined
}

define service{
use generic-service ; Inherit values from a template
host_name Router_1
service_description Uptime
check_command check_snmp!-C public -o sysUpTime.0 -H 172.17.42.22
}

define service{
use generic-service ; Inherit values from a template
host_name Router_1
service_description Port 2 Link Status
check_command check_snmp!-C public -o ifOperStatus.2 -r 1 -H 172.17.42.22
}

define service{
use generic-service ; Inherit values from a template
host_name Router_1
service_description Port 2 Bandwidth Usage
check_command check_local_mrtgtraf!/var/www/html/mymrtg/172.17.42.22_2.log!AVG!1000000,1000000!5000000,5000000!10
}

5. Verify the configuration of nagios
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

6. Restart nagios service.
/etc/init.d/nagios restart

 

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.

 

graphs not geting generated in pnp nagios

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.

 

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!

 

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.

 

still having trouble

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 $ARG5$
}

 

What output does this command give you?

Code:

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

 

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

Code:

/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.

 

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.