SNMP Monitoring conundrum

[Marc Powell]

On Jul 16, 2009, at 4:50 PM, Israel Brewster wrote:

> I have a number of scripts I have developed to monitor our UPS units  
> via SNMP - I found the included plugins didn't give me enough power/ 
> flexibility with the monitoring, so I made my own. Unfortunately, we  
> have just added a new UPS to the system which, although made by the  
> same company, uses different OID's for the data I am pulling. Thus  
> the issue: I want the same data, so other than the OID's the  
> existing scripts would work. But how do I deal with different OID's  
> on different devices?
>
> So far I've thought of the following:
> 1) Make a second copy of my scripts with the new OID's. Also implies  
> creating new contacts to use the new script (the notification script  
> pulls data such as estimated run time via snmp) and maintaining two  
> copies of each check/notification script
>
> 2) Somehow pass the OID's to the scripts from nagios. Not quite sure  
> how I would manage this, as the OID's would need to be associated  
> with the hosts, and further complicated by the fact that some  
> scripts use 3 or more OID's - for example, the main script looks at  
> UPS state(On battery, on line power, etc) estimated run time (if on  
> battery) and time on battery - so it would need to be passed three  
> separate OIDS. Perhaps this approach could be simplified by simply  
> passing a code identifying which set of OID's the script should use,  
> at the expense of a more complicated script. Still need to find some  
> way of getting that into Nagios so it can pass the appropriate value  
> to the script though.

Beyond what you've received so far, you can pass arguments to the  
command from the service definitions too so there are a number of ways  
that you can pass information for your script to act on. The only part  
you really need to figure out is what 'standard' information you want  
to pass to the script and what tools the language it's written is  
provides to parse those arguments --

http://nagios.sourceforge.net/docs/3_0/macros.html (Command Argument  
Macros)

define service {
	host_name fancyups1
	service_description SNMPCHECK
	check_command my_check_command!APC!.1.3.1.6.1.3!.1.3.1.7.5.4
}
define service {
	host_name fancyups1
	service_description SNMPCHECK
	check_command my_check_command!APC!.1.3.1.6.1.3!.1.3.1.7.5.4
}
define service {
	host_name fancyups2
	service_description SNMPCHECK
	check_command my_check_command!MGE!.1.3.1.6.1.3.10.17!. 
1.3.1.6.1.4.3.2.4
}

define command {
	command_name my_check_command
	command_line $USER1$/my_custom_script --type $ARG1$ --oid $ARG2$ -- 
oid $ARG3$  ; assumes your script can parse opts or
#	command_line $USER1$/my_custom_script $ARG1$ $ARG2$ $ARG3$
}

The two above then become
/path/to/my_custom_script --type APC --oid .1.3.1.6.1.3 --oid . 
1.3.1.7.5.4
/path/to/my_custom_script --type MGE --oid .1.3.1.6.1.3.10.17 --oid . 
1.3.1.6.1.4.3.2.4

or

/path/to/my_custom_script APC  .1.3.1.6.1.3  .1.3.1.7.5.4
/path/to/my_custom_script  MGE  .1.3.1.6.1.3.10.17  .1.3.1.6.1.4.3.2.4

--
MArc


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