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NRPE: Unable to read output
Posted: Wed Oct 05, 2016 2:37 am
by natalia.fitsyk
Hi,
I have a problem with my custom plugin.
I use nagios plugin jmeter.pl
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[root@client_nrpe ~]# /usr/local/nagios/libexec/check_nrpe -H localhost -c check_jmeter
NRPE: Unable to read output
output from more /etc/nagios/nrpe.cfg
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command[check_jmeter]=/usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w 1 -c 1
this is my script for jmeter:
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more /usr/local/nagios/libexec/check_site.sh
#!/bin/bash
sudo -u nrpe sudo /home/nagios/apache-jmeter-3.0/bin/jmeter.pl -j /home/nagios/apache-jmeter-3.0/ -p /home/nagios/apache-jmeter-3.0/bin/dermsl01_buono.jmx
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[root@client_nrpe ~]# grep nrpe /etc/sudoers
nrpe ALL=(ALL)NOPASSWD: /usr/local/nagios/libexec/check_jmeter, /usr/local/nagios/libexec/check_nrpe, /usr/local/nagios/libexec/check_site.sh, /usr/local/nagios/libexec/script_jmeter.sh, /home/nagios/apache-jmeter-3.0/bin/jmeter, /root/apache-jmeter-3.0/bin/jmeter.pl, /home/nagios/apache-jmeter-3.0/bin/jmeter.pl
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[root@client_nrpe ~]# ll /usr/local/nagios/libexec/check_site.sh
-rwxrwxrwx 1 nrpe nagios 570 Oct 3 18:14 /usr/local/nagios/libexec/check_site.sh
This is the output when I execute the script for check_site.sh:
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[root@client_nrpe ~]# /usr/local/nagios/libexec/check_site.sh
OK : sum:15730 : 15.73 seconds to complete.
This is the output from check_users
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[root@client_nrpe ~]# /usr/local/nagios/libexec/check_nrpe -H localhost -c check_users
USERS OK - 2 users currently logged in |users=2;5;10;0
Iptables and Selinux are off.
Can you help me please?
Thanks.
Natalia
Re: NRPE: Unable to read output
Posted: Wed Oct 05, 2016 2:02 pm
by lgroschen
Hello!
This is a common mistake when creating your own plugin. All you should have to do to fix this would be to follow the developer guidelines on how generate nagios style output like this:
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'label'=value[UOM];[warn];[crit];[min];[max]
Here is the resource. I'm sure there is a lot of stuff in this document that will help you make more plugins:
https://nagios-plugins.org/doc/guidelines.html#AEN200
Let us know how this turns out! Would be happy to help
Re: NRPE: Unable to read output
Posted: Fri Oct 07, 2016 8:00 am
by natalia.fitsyk
Hi,
I edit the /etc/nagios/nrpe.cfg and change form value to "ARG"
from
command[check_jmeter]=/usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w 1 -c 1
to
command[check_jmeter]=/usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w $ARG1$ -c $ARG2$
restart nrpe but the output don't change:
[root@client_nrpe ~]# /usr/local/nagios/libexec/check_nrpe -H localhost -c check_jmeter
NRPE: Unable to read output
What is wrong?
Can you help me please?
Thank.
Natalia
Re: NRPE: Unable to read output
Posted: Fri Oct 07, 2016 11:20 am
by lgroschen
Try running through this doc, it might be a simple permission issue:
https://assets.nagios.com/downloads/nag ... utions.pdf
Re: NRPE: Unable to read output
Posted: Tue Oct 11, 2016 7:12 am
by natalia.fitsyk
Hi,
I have checked every suggestion about my check_custom but I don't find errors.
Can anyone help me please?
Thanks.
Natalia
Re: NRPE: Unable to read output
Posted: Tue Oct 11, 2016 11:04 am
by rkennedy
When you run the check_nrpe from the command line on the Nagios machine, please run tail -f /var/log/messages on your client machine. (might vary depending on your OS)
This will show us why the check is failing.
Re: NRPE: Unable to read output
Posted: Wed Oct 12, 2016 2:22 am
by natalia.fitsyk
Hi,
I don't have any output on
/var/log/messages when I run
check_nrpe -H localhost -c check_jmeter 
Thank.
Natalia
Re: NRPE: Unable to read output
Posted: Wed Oct 12, 2016 3:33 pm
by lmiltchev
I don't have any output on /var/log/messages when I run check_nrpe -H localhost -c check_jmeter
If you changed your command to:
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command[check_jmeter]=/usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w $ARG1$ -c $ARG2$
then you need to test it by running:
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./check_nrpe -H localhost -c check_jmeter -a 1 1
: "-a" is used to pass arguments. In this case, you are passing '1' for $ARG1$, and '1' for $ARG2$.
You have some entries in sudoers for the "nrpe" user. Do you actually have an "nrpe" user on this system? Can you test the command logged in as "nrpe" user?
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su nrpe
sudo /home/nagios/apache-jmeter-3.0/bin/jmeter.pl -j /home/nagios/apache-jmeter-3.0/ -p /home/nagios/apache-jmeter-3.0/bin/dermsl01_buono.jmx
sudo /usr/local/nagios/libexec/check_site.sh -w 1 -c 1
./check_nrpe -H localhost -c check_jmeter -a 1 1
Re: NRPE: Unable to read output
Posted: Thu Oct 13, 2016 4:08 am
by natalia.fitsyk
Hi,
This is the output :
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[root@client_nrpe ~]# su nrpe
bash-4.1$ sudo /home/nagios/apache-jmeter-3.0/bin/jmeter.pl -j /home/nagios/apache-jmeter-3.0/ -p /home/nagios/apache-jmeter-3.0/bin/dermsl01_buono.jmx
OK : sum:4806 : 4.806 seconds to complete.
bash-4.1$ sudo /usr/local/nagios/libexec/check_site.sh -w 1 -c 1
OK : sum:2131 : 2.131 seconds to complete.
bash-4.1$ ./check_nrpe -H localhost -c check_jmeter -a 1 1
bash: ./check_nrpe: Permission denied
bash-4.1$ sudo ./check_nrpe -H localhost -c check_jmeter -a 1 1
[sudo] password for nrpe:
sudo: ./check_nrpe: command not found
bash-4.1$ pwd
When I run from login with nrpe user :
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-bash-4.1$ pwd
/var/run/nrpe
-bash-4.1$ ./check_nrpe -H localhost -c check_jmeter
-bash: ./check_nrpe: No such file or directory
-bash-4.1$ ./check_nrpe -H localhost -c check_jmeter -a 1 1
-bash: ./check_nrpe: No such file or directory
-bash-4.1$ sudo /home/nagios/apache-jmeter-3.0/bin/jmeter.pl -j /home/nagios/apache-jmeter-3.0/ -p /home/nagios/apache-jmeter-3.0/bin/dermsl01_buono.jmx
OK : sum:2427 : 2.427 seconds to complete.
-bash-4.1$ sudo /usr/local/nagios/libexec/check_site.sh -w 1 -c 1
OK : sum:2309 : 2.309 seconds to complete.
-bash-4.1$ ./check_nrpe -H localhost -c check_jmeter -a 1 1
-bash: ./check_nrpe: No such file or directory
-bash-4.1$ sudo ./check_nrpe -H localhost -c check_jmeter -a 1 1
[sudo] password for nrpe:
sudo: ./check_nrpe: command not found
Thanks a lot.
Natalia
Re: NRPE: Unable to read output
Posted: Thu Oct 13, 2016 10:16 am
by dwhitfield
rkennedy wrote:(might vary depending on your OS)
What OS and version are you running? If CentOS, you can get your version from
rpm --query centos-release.