Nagios Support Forum

Posted: **Mon Jan 28, 2019 9:54 am**

Hi All,

I'm trying to get an event handler enabled on some of our "non-critical" hosts that automatically acknowledges them if they go down. I.e hosts that we want to monitor but don't need to be alerted on our maps and notifications when they go down.

Currently I have the host defined as below;

Code: Select all

define host{
use             	         B-Hosts,host-pnp
host_name       	         TEST_PRINTER
alias           	         TEST_PRINTER
address          	         172.21.141.29
check_command    	 check-host-alive
hostgroups      	         printers
icon_image      	         printer.png
event_handler		 auto-acknowledge
}

The command in "commands.cfg" defined as;

Code: Select all

define command{
        command_name    auto-acknowledge
        command_line    $USER1$/auto-acknowledge.sh $HOSTSTATE$ $HOSTSTATETYPE$ $HOSTATTEMPT$ $HOSTNAME$
        }

And finally the "auto-acknowledge.sh" as

Code: Select all

#!/bin/sh
#
# Event handler script for acknowledging non critical hosts. 
#
#

# What state is the Host  in?
case "$1" in
UP)
	;;
UNREACHABLE)
	;;
DOWN)
	case "$2" in

	SOFT)

		case "$3" in

		1)
			now=`date +%s`
			commandfile='/usr/local/nagios/var/rw/nagios.cmd'
			/bin/printf "[%lu] ACKNOWLEDGE_HOST_PROBLEM;$4;2;1;1;Autobot;Non-critical host, outage acknowledged\n" $now > $commandfile    
			;;
			esac
		;;

	HARD)
		now=`date +%s`
		commandfile='/usr/local/nagios/var/rw/nagios.cmd'
		/bin/printf "[%lu] ACKNOWLEDGE_HOST_PROBLEM;$4;2;0;1;Autobot;Non-critical host, outage acknowledged\n" $now > $commandfile    
		;;
	esac
	;;
esac
exit 0

The "enable_event_handlers=1" option in nagios.cfg is enabled so I don't understand why it wont work? Does anyone have any ideas? I know my script could be wrong as I'm still very new to bash scripts however it appears to work fine when entered into the terminal.

Thanks

Posted: **Tue Jan 29, 2019 8:36 am**

Hmm, you are referencing $now & $commandfile variables in the script but do not have them defined.

Also, your host does not have the following which would be required for it to trigger

Code: Select all

event_handler_enabled    1

Posted: **Tue Jan 29, 2019 11:13 am**

Hi Scott,

They are defined using the below before calling the command.

Code: Select all

now=`date +%s`
commandfile='/usr/local/nagios/var/rw/nagios.cmd'
/bin/printf "[%lu] ACKNOWLEDGE_HOST_PROBLEM;$4;2;1;1;Autobot;Non-critical host, outage acknowledged\n" $now > $commandfile

I'll try enabling event_handler_enabled 1 now however I thought if that was defined globally in nagios that it wasn't required.

Thanks!

Posted: **Tue Jan 29, 2019 11:22 am**

Figment wrote:They are defined using the below before calling the command.
Code: Select all
now=`date +%s`
    commandfile='/usr/local/nagios/var/rw/nagios.cmd'
    /bin/printf "[%lu] ACKNOWLEDGE_HOST_PROBLEM;$4;2;1;1;Autobot;Non-critical host, outage acknowledged\n" $now > $commandfile 

Not sure how they missed that.

Figment wrote: I'll try enabling event_handler_enabled 1 now however I thought if that was defined globally in nagios that it wasn't required.

You cannot enable event handlers to run per host globally, you can only turn on or off the ability for any to run globally, but they still need to be defined in the host/service object.

Posted: **Tue Jan 29, 2019 12:11 pm**

Hi Scott,

Did not realise it needed enabling per host, thanks for that. I added that to the host however it still isn't running the script. Heres the snipit from nagios.log

[1548781032] Warning: Check of host 'TEST_PRINTER' timed out after 30.01 seconds
[1548781032] HOST EVENT HANDLER: TEST_PRINTER;DOWN;SOFT;3;auto-acknowledge
[1548781032] wproc: HOST EVENTHANDLER job 2641 from worker Core Worker 32546 is a non-check helper but exited with return code 13
[1548781032] wproc: early_timeout=0; exited_ok=1; wait_status=3328; error_code=0;
[1548781032] wproc: stderr line 01: execvp(/usr/local/nagios/libexec/auto-acknowledge.sh, ...) failed. errno is 13: Permission denied
[1548781032] wproc: Core Worker 32545: job 2589 (pid=16791): Dormant child reaped
[1548781039] wproc: Core Worker 32543: job 2604 (pid=16899) timed out. Killing it

My issue looks to be this "Permission Denied", the file "auto-acknowledge" has the owner "nagios" (as does the "libexec" directory) however all other files in the directory have the owner set to "root". The folder "/usr/nagios" is also set to owner root.

Any ideas as to what this should be set too in terms of permissions to allow access?

Posted: **Tue Jan 29, 2019 12:32 pm**

Can you show the permissions of the file

Code: Select all

ls -l /usr/local/nagios/libexec/auto-acknowledge.sh

this needs to be executable by the nagios user

Posted: **Tue Jan 29, 2019 12:39 pm**

The permisions list is as below

-rw-r--r--. 1 nagios nagios 693 Jan 28 14:42 /usr/local/nagios/libexec/auto-acknowledge.sh

Looks okay, I think?

Posted: **Tue Jan 29, 2019 12:41 pm**

Figment wrote:Looks okay, I think?

no, please run the following

Code: Select all

chmod +x /usr/local/nagios/libexec/auto-acknowledge.sh

Then is should work

Posted: **Tue Jan 29, 2019 12:55 pm**

Hi Scott,

Just to check should this be ran as "root" or as "nagios".

Thanks

Posted: **Tue Jan 29, 2019 1:14 pm**

the chmod command should be run as root

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