NRPE: Unable to read output

[natalia.fitsyk]

Hi,
[root@client_nrpe ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.7 (Santiago)
2.6.32-573.7.1.el6.x86_64
Thanks.

[dwhitfield]

Could you post the output of ls -la /usr/local/nagios/libexec?

This is the piece I don't understand at the moment: sudo: ./check_nrpe: command not found paired with [root@client_nrpe ~]# /usr/local/nagios/libexec/check_nrpe -H localhost -c check_users

[natalia.fitsyk]

Hi,
ls -la /usr/local/nagios/libexec/ > libexec.txt (see attached file)

[root@client ~]# /usr/local/nagios/libexec/check_nrpe -H localhost -c check_users
USERS OK - 1 users currently logged in |users=1;5;10;0

sudo: ./check_nrpe: command not found

When I try to run the command ./check_nrpe by logging in with user nrpe I have this output:
./check_nrpe: command not found

Because the home directory for user nrpe is /var/run/nrpe

[root@client_nrpe ~]# grep nrpe /etc/passwd
nrpe:x:500:502::/var/run/nrpe:/bin/bash

bash-4.1$ sudo ./check_nrpe
[sudo] password for nrpe:
sudo: ./check_nrpe: command not found
-bash-4.1$ pwd
/var/run/nrpe

Thanks.

[dwhitfield]

You just need to add that directory to the nrpe user's PATH. Please let us know if you have any questions after looking through http://www.troubleshooters.com/linux/prepostpath.htm

[natalia.fitsyk]

Hi,
I added on PATH for nrpe user: /usr/local/nagios/libexec
-bash-4.1$ echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/var/run/nrpe/bin:/usr/local/nagios/libexec
-bash-4.1$ whoami
nrpe

But don't solved a problem:
-bash-4.1$ /usr/local/nagios/libexec/check_nrpe -H localhost -c check_jmeter
NRPE: Unable to read output
-bash-4.1$ /usr/local/nagios/libexec/check_nrpe -H localhost -c check_users
USERS OK - 2 users currently logged in |users=2;5;10;0

Thanks.
Natalia.

[dwhitfield]

Are you running NRPE through xinetd or stand-alone? If the second, did you allow it through the firewall? Did you add the server's IP into your allowed_from in your nrpe.cfg?

[natalia.fitsyk]

Hi,
[root@client_nrpe ~]# /etc/init.d/iptables status
iptables: Firewall is not running.
[root@client_nrpe ~]# /etc/init.d/ip6tables status
ip6tables: Firewall is not running.
Selinux is off

NRPE is stand-alone service.
IP is allowed because another check_xx are running correctly.

[root@client_nrpe ~]# /usr/local/nagios/libexec/check_nrpe -H localhost -c check_load
OK - load average: 0.00, 0.00, 0.00|load1=0.000;15.000;30.000;0; load5=0.000;10.000;25.000;0; load15=0.000;5.000;20.000;0;

Thanks.
Natalia.

[rkennedy]

I believe the problem is with permissions due to the sudo in multiple places here -

Code: Select all

    #!/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


Could you attempt the following from the client side?

Code: Select all

su - nagios
/usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w 1 -c 1


(not sure why you're passing -w 1 and -c 1 when they are not passed in check_site.sh anywhere)

Let us know the error you receive when trying to run it, and also post your /etc/sudoers.

[tmcdonald]

Hi,

Code: Select all

-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 -w 15 -c 30
OK : sum:2309 : 2.309 seconds to complete.
-bash-4.1$ pwd
/var/run/nrpe
-bash-4.1$ whoami
nrpe

-bash-4.1$ grep check_jmeter /etc/nagios/nrpe.cfg
command[check_jmeter]=/usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w $ARG1$ -c $ARG2$

[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, /home/nagios/apache-jmeter-3.0/bin/jmeter.pl, /home/nagios/apache-jmeter-3.0/bin/dermsl01_buono.jmx

-bash-4.1$ /usr/bin/sudo /usr/local/nagios/libexec/check_site.sh -w $ARG1$ -c $ARG2$
OK : sum:2265 : 2.265 seconds to complete.

-bash-4.1$ cd /home/nagios/apache-jmeter-3.0/bin/
-bash-4.1$ sudo ./jmeter.pl -j /home/nagios/apache-jmeter-3.0/ -p /home/nagios/apache-jmeter-3.0/bin/dermsl01_buono.jmx
OK : sum:2122 : 2.122 seconds to complete.

-bash-4.1$ /usr/bin/sudo /usr/local/nagios/libexec/check_site.sh
OK : sum:2241 : 2.241 seconds to complete.

But

Code: Select all

-bash-4.1$ /usr/local/nagios/libexec/check_nrpe -H localhost -c check_jmeter
NRPE: Unable to read output

Thanks.
Natalia.

[ssax]

Please attach your nrpe.cfg file and also the jmeter.pl script, it may have to do with it not having the correct paths (meaning running from CLI manually will already have the paths set, when it runs as a service it may have different paths).


Thank you