Using Nagios to monitor "service-less" hosts

[Giles Coochey]

> 
> Hi Fermin,
> 
> >> Is that right? Why don't fully decouple host-monitoring 
> from service monitoring?
> 
> No.  Nagios does use the check-host-alive command to 
> determine if the host is up - and, yes, hosts and services 
> are separate in that a host doesn't have to have any 
> services, but a service must have a host.
> 

I thought host checks were only there to prevent you from receiving multiple service notifications when a host went down.


> I have 2 hosts which are actually 2 gateway routers, which do 
> not have any corresponding services.  Nagios issues a warning 
> saying they don't have any services associated on every 
> startup, but it monitors them perfectly.  Even if they drop 
> off the network for a few seconds, Nagios knows about it.  
> This is through the use of check_ping as the check-host-alive 
> command - however, on one of my previous servers, the gateway 
> router blocked ICMP, so I used check_ssh as the 
> check-host-alive command which also worked perfectly.
> 

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).

> It sounds as if you don't have active checks enabled for the 
> hosts.  The error "Not enough data..." means an active or 
> passive check hasn't been submitted for the host yet.
> 

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).

> Take a look <snip!>

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 :-)

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