Why are there "commands"?

[Mark Gius]

It allows you to have a single "command" that may have variable results 
depending on which "service" uses it.

IE, you can have one command, check_disk which is defined with

command check_disk -w $ARG1$ -c $ARG2$ -H $HOSTADDRESS$

and then two services, "Check disk fileserver" and "check disk webserver"

In these, you'll define

check_command check_disk!80!90

or

check_command check_disk!85!95

So now your web servers and file servers are using the same command with 
different arguments depending on which service you choose to apply to a 
host.

It's true that you can have a 1-1 command/service relationship, but this 
method allows you to be more flexible.

This works for Nagios 2.x as well as 3.x

-Gius

David Dyer-Bennet wrote:
> I don't really understand the purpose / utility of the "command" level of
> abstraction in Nagios configuration.  (2.10; we're still on Centos 4.7).
>
> To define a new service to check particular Windows web services we've
> written, I define a service, and then it has to refer to a command, and
> over in the command I have to hard-code the parameters needed to test this
> specific service -- so in fact I need a separate command for each service.
>  This seems, to me, to just introduce confusion, and separate bits of
> information that belong together.
>
> Is this just a historical artifact that in fact doesn't make much sense,
> or are there lots of cases where it's useful and makes it easier or
> clearer to do what you want?
>
> (I'm fine with "that's the way it works, but it doesn't really make much
> sense as it turns out", I've got plenty of that in my own code; I'm just
> looking for more understanding, in case it makes more sense than I've so
> far figured out.)
>
> As a broader question, are there documents that give more of a logical
> overview of Nagios, explaining how and why things are broken up and how
> they work together?
>   


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