Dynamically add/remove hosts on Nagios

[Felipe Cecagno]

Hi everybody,

This is the first time I'm posting on this mailing list, so I'm sorry if my
question was already discussed here - I tried to find information about it
on the mailing list and also on Nagios documentation + googling, but
couldn't find it.

Well, I'm setting up Nagios to monitor a group of servers in a cloud
environment. I decided to use passive checks, so I will have one Nagios
central monitor and all servers push statistics to Nagios using NSCA.
Everything is OK so far.

The problem is that I want to add and remove instances dynamically, I don't
want to manually modify hosts.cfg on the central each time I change my
infrastructure. So my idea was that when a new instance gets up, it will
send to Nagios something like (always using NSCA):

"localhost     Server UP     0     <new instance IP>"

On Nagios I would create a new service on localhost to handle this passive
check.
I've created a Python script (that uses pynag) to modify the hosts.cfg file
in order to add and remove host definitions. When Nagios receives this
passive check, I would call the script to modify the hosts definition
files, and a cron job would execute every minute to look for modifications
on hosts.cfg and make Nagios reload the definition files.

My doubts are:
- is there a smarter way to do that (dynamically add and remove hosts from
Nagios)?
- since my "Server UP" service uses passive checks only, how do I make
Nagios call my script to modify hosts.cfg every time it receives the
passive check?

Any thoughts/suggestions would be appreciated. :)

Thank you in advance,
Best regards,

--
   Felipe Cecagno
   Mconf Development Team
   https://mconf.org
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