Nagios Support Forum • negate plug-in - No data returned from command

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negate plug-in - No data returned from command

Posted: Wed Dec 23, 2015 6:57 am

by disarm76

Hi,

I'm trying to use the negate plug-in to change CRITICAL to OK. It is, according to the plug-in help, a default feature so no need to specify.

However, as you can see below, I can run the plug-in I need (check_as400) and it works fine, but not with negate.

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[root@nagios libexec]# ./check_as400 -H trqvida -u nagiosc -p ********  -v CJ TEMPBATCH
CRITICAL - job(TEMPBATCH) NOT IN SYSTEM

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[root@nagios libexec]# ./negate /usr/local/nagios/libexec/check_as400 -H trqvida -u nagiosc -p ********  -v CJ TEMPBATCH
No data returned from command

I even changed the timeout time, since check_as400 is on a 60s timeout but I get the same result. And the 'No date returned..." return is instantaneous.

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[root@nagios libexec]# ./negate -t 70 /usr/local/nagios/libexec/check_as400 -H trqvida -u nagiosc -p ********  -v CJ TEMPBATCH
No data returned from command

On other hand I can create my own script that manipulates the results and concatenate it. Anyone know how to do that?

Can you help me with this problem? Thanks.

Using:
NagiosXI 5.2.3
CentosOS 6.6 64bit

Re: negate plug-in - No data returned from command

Posted: Wed Dec 23, 2015 9:49 am

by Box293

What is the output of:

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/usr/local/nagios/libexec/negate /usr/local/nagios/libexec/check_dummy 0 OK
echo $?

Does your password have any special characters? Perhaps try putting the password in single quotes.

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./negate /usr/local/nagios/libexec/check_as400 -H trqvida -u nagiosc -p '********' -v CJ TEMPBATCH

Re: negate plug-in - No data returned from command

Posted: Wed Dec 23, 2015 10:19 am

by disarm76

Thanks for helping!

OK the first:

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[root@nagios libexec]# /usr/local/nagios/libexec/negate /usr/local/nagios/libexec/check_dummy 0 OK
OK: OK
[root@nagios libexec]# echo $?
2

The password is alphanumeric but tried the quotes getting the same result.

Re: negate plug-in - No data returned from command

Posted: Wed Dec 23, 2015 11:56 am

by Box293

The check_as400 plugin is going to be the source of the problem.

Does the check_as400 plugin have a verbose argument to show what is happening?

What happens when you test as the nagios user?

Code: Select all

su nagios
./negate /usr/local/nagios/libexec/check_as400 -H trqvida -u nagiosc -p '********' -v CJ TEMPBATCH

Re: negate plug-in - No data returned from command

Posted: Mon Dec 28, 2015 5:28 am

by disarm76

OK, so the check_as400 connects via telnet and with verbose active:

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[root@nagios libexec]# ./check_as400 -d -H trqvida -u nagiosc -p **********  -v CJ TEMPBATCH
Establishing connection to server...done.
Logging in...
  waiting for screen...
    waiting for token IBM CORP...
    token received.
  sending login information for nagiosc...
  waiting for login to process...
    waiting for token ===>...
    token received.
Login completed.
Sending command (4)...
    waiting for token F3=...
    token received.
    waiting for token Selection...
CRITICAL - job(TEMPBATCH) NOT IN SYSTEM
Logging out...
  sending F3...
    waiting for token ===>...
    token received.
  requesting signoff...
    waiting for token stem...
    token received.
Job ending immediately
    waiting for token stem...
    token received.
  terminating connection...
Logged out.

As nagios, I get the same:

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[nagios@nagios libexec]$ ./negate /usr/local/nagios/libexec/check_as400 -d -H trqvida -u nagiosc -p ********** -v CJ TEMPBATCH
No data returned from command

Re: negate plug-in - No data returned from command

Posted: Mon Dec 28, 2015 11:04 am

by rkennedy

Can you try running the check as the Nagios user and then the echo command? This will show us if the script is exiting properly or not.

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./check_as400 -d -H trqvida -u nagiosc -p **********  -v CJ TEMPBATCH

then run -

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echo $?

Please post the output of both commands for us to take a look at.

Re: negate plug-in - No data returned from command

Posted: Mon Dec 28, 2015 11:26 am

by disarm76

Code: Select all

[nagios@nagios libexec]$ ./check_as400 -d -H trqvida -u nagiosc -p ********  -v CJ TEMPBATCH
Establishing connection to server...done.
Logging in...
  waiting for screen...
    waiting for token IBM CORP...
    token received.
  sending login information for nagiosc...
  waiting for login to process...
    waiting for token ===>...
    token received.
Login completed.
Sending command (4)...
    waiting for token F3=...
    token received.
    waiting for token Selection...
CRITICAL - job(TEMPBATCH) NOT IN SYSTEM
Logging out...
  sending F3...
    waiting for token ===>...
    token received.
  requesting signoff...
    waiting for token stem...
    token received.
Job ending immediately
    waiting for token stem...
    token received.
  terminating connection...
Logged out.
[nagios@nagios libexec]$ echo $?
2
[nagios@nagios libexec]$

Re: negate plug-in - No data returned from command

Posted: Mon Dec 28, 2015 1:04 pm

by tgriep

Can you post your check_as400 plugin that you are using here so we can review it?

The check_as400 plugin I found uses a .as400 file that is stores on the system to get the username and password to login to the AS400 server and I am thinking that when the negate plugin runs the check_as400 check, it doesn't have the correct permissions to open the text file it uses for the login credentials.
Also, can you run the following and post the output here?

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ls -l /usr/local/nagios/libexec

Re: negate plug-in - No data returned from command

Posted: Mon Dec 28, 2015 1:46 pm

by rkennedy

As @tgriep posted above - the issue may be the permissions with that file. Please do post the output of what he mentioned.

I did create a simple bash script to change the exit codes as needed. Change the password in the -p parameter. If permissions are the issue though, then this script will not work either.

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#!/bin/bash

# define vars
script=$(/usr/local/nagios/libexec/check_as400 -d -H trqvida -u nagiosc -p password CJ TEMPBATCH)

# switch CRITICAL to OK
if [[ $script == *"CRITICAL"* ]]
then
echo "OK"
exit 0

# WARNING stays the same
elif [[ $script == *"WARNING"* ]]
then
echo "WARNING"
exit 1

# switch OK to CRITICAL
elif [[ $script == *"OK"* ]]
then
echo "CRITICAL"
exit 2

# catchall UNKNOWN
else
echo "UNKNOWN"
exit 3
fi

Re: negate plug-in - No data returned from command

Posted: Tue Dec 29, 2015 5:25 am

by disarm76

OK, it's working! Well, it's one script for one alert but these kind of alerts are rare.
Thank you for your help!

Code: Select all

[root@nagios libexec]# ./check_as400  -H trqvida -u nagiosc -p ********  -v CJ TEMPBATCH
CRITICAL - job(TEMPBATCH) NOT IN SYSTEM
[root@nagios libexec]# ./check_as400_job_TEMPBATCH_negated.sh
OK - BATCH Terminado

As a test I gave full permissions to all as400 files and still got the same result:

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[root@nagios libexec]# ls -la *as400*
-rwxrwxrwx 1 apache nagios   225 Nov 18 17:42 check_as400
-rwxrwxrwx 1 apache nagios   225 Nov 18 17:37 check_as400_BK
-rwxrwxrwx 1 apache nagios 35004 Nov 20 17:41 check_as400.class
-rwxrwxrwx 1 apache nagios   787 Nov 20 17:41 check_as400_cmd_vars.class
-rwxrwxrwx 1 apache nagios  1517 Nov 20 17:41 check_as400_lang.class
-rwxrwxrwx 1 apache nagios 11646 Nov 28  2013 check_as400sql.php
-rwxrwxrwx 1 root   nagios   474 Dec 29 09:36 check_as400_trqvida_job_TEMPBATCH_negated.sh

[root@nagios libexec]# ls -la .as400*
-rwxrwxrwx 1 apache nagios 12 Nov 20 11:26 .as400

[root@nagios libexec]# /usr/local/nagios/libexec/negate /usr/local/nagios/libexec/check_as400  -H trqvida -u nagiosc -p *******  -v CJ TEMPBATCH
No data returned from command