How to call Python script within Nagios check

[jankogaga]

Hi,

I would like to call Python script within Nagios check.
Python script has the arguments. E.g.:
/usr/local/nagios/libexec/check_ssl.py -H google.com -c E+,E,E-,F+,F,F-,T,M,C+,C-,C,D+,D,D- -d 15
and it works when I run in command line for nagios user.

What I have tried and it didn't work for me:

in commands.cfg:

Code: Select all

define command{
        command_name check_ssl
        command_line /usr/local/nagios/libexec/check_ssl.py -H $ARG1$ -c $ARG2$ -d $ARG3$
}

monitor.cfg:

Code: Select all

define service{
        use                             local-service         ; Name of service template to use
        host_name                          xxx
        service_description             SSLLABS Web service
        check_command                 check_ssl!google.com!E+,E,E-,F+,F,F-,T,M,C+,C-,C,D+,D,D-!15
        notifications_enabled           1
        }

Thanks,
Dragan

[mbellerue]

The only thing I'm seeing right away is the service definition is missing some information.

https://assets.nagios.com/downloads/nag ... ml#service

[jankogaga]

Hi,

Thank you for your reply.
We run Nagios Core 4.4.3.
In the same .cfg file for the host we have already working service definition like this:

Code: Select all

 define service{
        use                                    local-service         ; Name of service template to use
        host_name                         xxx
        service_description            Swap Usage
        check_command                check_local_swap!20!10
        }

Thanks,
Dragan

[mbellerue]

What does the Service page look like in Nagios? Does it show an error, or just give an Unknown status?

What if you altered your command to call Python specifically?

Code: Select all

command_line /usr/bin/env python2 /usr/local/nagios/libexec/check_ssl.py -H $ARG1$ -c $ARG2$ -d $ARG3$

Or /usr/bin/env python3 if it's a Python 3 script, of course.

[jankogaga]

I have got the following message in Nagios WebGUI:

Code: Select all

	(Return code of 127 is out of bounds. Check if plugin exists)

When running a python script from the command line as nagios user, I have got:

Code: Select all

bash-4.2$ /usr/bin/env python3  /usr/local/nagios/libexec/check_ssl.py -H google.com -c E+,E,E-,F+,F,F-,T,M,C+,C-,C,D+,D,D- -d 15
SSLLABS grade for google.com is A, ssl certificate expires in 55 days

[mbellerue]

Can you check /etc/group and make sure that the Apache user is in the Nagios group?

e.g.

Code: Select all

nagios:x:500:nagios,apache

Also what is the output of the following command?

Code: Select all

ls -l /usr/local/nagios/libexec/check_ssl*

[jankogaga]

/etc/group has the following records:

Code: Select all

nagios:x:992:nrpe
nagcmd:x:1000:nagios,apache

Please note that a bunch of services already work with that configuration.

The output of ls -l /usr/local/nagios/libexec/check_ssl* is

Code: Select all

-rwxr-xr-x 1 nagios nagios 8549 Aug  7 13:46 /usr/local/nagios/libexec/check_ssl.py

Thanks,
Dragan

[mbellerue]

The permissions do look good. Let's check the shebang on the script itself.

Code: Select all

head -2 /usr/local/nagios/libexec/check_ssl.py

Also, what command are you using when you switch over to the nagios user to run the check commands?

[jankogaga]

Here you are:

head -2 /usr/local/nagios/libexec/check_ssl.py

Code: Select all

#! /usr/bin/env python3
# -*- coding: utf-8 -*-

for switching to nagios user:

Code: Select all

su nagios

[mbellerue]

Try it with a dash.

Code: Select all

su - nagios

That should drop your user's environment, and give you just the nagios user's environment. Then try to run the check command.