Using Nagios to monitor "service-less" hosts

[Andy Shellam (Mailing Lists)]

Giles Coochey wrote:
>
> I thought host checks were only there to prevent you from receiving multiple service notifications when a host went down.
>   
Even if that's the way it was designed, you can still use it to 
determine if a host is up or down :)  Also, if you HAD to have a service 
for each host, Nagios wouldn't even start up.
>
> Are you sure? Is it not just alerting you it's down when nagios goes to work out where the network outage is (assuming you have parenting set).
>
>   
The gateways are the 2 main parents - there's nothing above them, but 
they do have servers below them.  The people that manage the SC_Gateway 
are re-routing to a new floor in the data-center, so at least once a day 
the router goes down for a few seconds when they apply new routing rules 
- Nagios tells me whenever this happens.
> Which I thought was because it didn't have a service attached to it, Nagios won't check a host if it doesn't have a service (at least that's how I've evaluated it's behaviour).
>   
No, hosts AND services have an active_checks_enabled parameter - so you 
can disable active checks on a host, but still check the services, and 
vice versa.
>
> Actually I thought Fermín's thoughts were more closer to the the way that my Nagios functions and it seems to be the way I expect it to function.
>
> If I want a serviceless host then I just attach it to the ping service (or similar). Though generally, any service-less hosts we would have we'd probably turn off and not put in nagios at all :-)
>   
That's basically what the check-active-host is - it's a ping command 
that saves you having to have a Ping service (because I wouldn't exactly 
class ping-ability as a service.)
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