Hostname variable concatenation

[rfischer]

Hello!
I've used Nagios for around a year. Took over the one running in the office, and I've learned a lot since then.

On to brass tacks: I need to monitor the bandwidth on multiple network devices (switches, routers, load balancers), so I read some of the documentation and setup mrtg to handle the data acquisition.
I've been told that we need to monitor the special interfaces (PortChannel, VLAN). The way the Nagios documentation recommends I do it is by defining one check per IP per interface, hardcoded:

Code: Select all

define service{
	use			generic-service	; Inherit values from a template
	host_name			linksys-srw224p
	service_description	Port 1 Bandwidth Usage
	check_command		check_local_mrtgtraf!/var/lib/mrtg/192.168.1.253_1.log!AVG!1000000,2000000!5000000,5000000!10
	}

This is not useful to me, as I'd have to generate over 100 service definitions per network device.

Is there a way to concatenate the hostname in the command?
So that check_command would end up like this:

Code: Select all

check_local_mrtgtraf!/var/lib/mrtg/$HOSTNAME$_1.log!AVG!1000000,2000000!5000000,5000000!10

[tmcdonald]

That's exactly how you would do it, that or use $HOSTADDRESS$ which might make more sense in case the name is not an IP. Also, the quotes are not needed.

[rfischer]

Excellent, thanks for your reply.

I'd become used to bash concatenation where I'd need to invoke obscure stuff to make whatever I was working on execute as I wanted it to. I wasn't really sure how Nagios handled it.

[eloyd]

Nagios Macros are your friend. A complete list of what they are and when they are valid is available at https://assets.nagios.com/downloads/nag ... olist.html

[hsmith]

Thanks, Eric. Did you have any more questions, OP?