Distributed monitoring solution - some questions

[Simone Felici]

Hello to all!

I'm planning to change a little the structure of our monitoring system. The central core has a private IP and it makes 
NAT to check all hosts/services. This creates a LOT of NATs on the gateway router.
This is the first reason I want to introduce a distributed monitoring system (on public net) with NSCA (server/client) 
as descrived in the documentation.
My doubt is: In case the of the nagios Distributed Monitoring server (probe) goes DOWN, I don't receive of course status 
of their monitoired hosts. BUT If I enable active checks as well, the central core server would try active checks 
anyway. From here a question concern active/passive checks:

I have (i.e.) a host with some services monitored from central core every 20 minutes (active/passive checks enabled)
The same host is monitored from the Distributed monitoring server every 10 minutes. The Distributed monitoring server 
sends the status to che central core (send_nsca) and an EXTERNAL COMMAND/PASSIVE CHECK update the status.

Every time the Distributed monitoring server sends the status of a host to the core server, does the core server reset 
the timer when it makes an active check or does it make an active check anyway?

With status from distributed server every 10 minutes, if the active check time would be resetted, it wouldn't do any 
active checks and this would prevent useless active checks. The same time in case of failover of the distributed 
monitoring server, also in case of emergency, the core would then check every 20 minutes the hosts directly.

Is this scenario true or would the central core do active checks regardless incoming passive checks?

Any other help or suggestion would be appreciated.

Thank's a lot for your help.

Simon



-- 
Simone Felici                    E-Mail: s.felici at alpikom.it
Divisione Tecnica                Tel:    0461 030 111
Alpikom S.p.A.                   Fax:    0461 030 112
v.Fersina, 23 - 38123 Trento     URL:    http://www.alpikom.it

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