[Nagios-devel] Defining services at runtime

[Jason Martin]

On Thu, May 11, 2006 at 08:03:39PM +0200, moshe sharon wrote:
> i dont know if it helps but there is a plugins called check_find_new_hosts
> at nagiosexchange
> http://www.nagiosexchange.org/Networking.53.0.html?&tx_netnagext_pi1[p_view]=275
> 
> basically it adds new hosts to nagios when it runs. i did not test it and im
> not sure about services but im pretty sure it can be extended
> to do what you need
Keep in mind that this isn't a "runtime" change, rather it is a
plugin that rewrites your config files and HUPs nagios.  It is a
significant difference.

-Jason Martin

> Hope it helped
> Moshe Sharon
> 
> On 5/11/06, Sam Stickland <sam_mailinglists at spacething.org> wrote:
> >
> >Thanks for your reply Bob.
> >
> >Comments are inline.
> >
> >> -----Original Message-----
> >> From: nagios-devel-admin at lists.sourceforge.net [mailto:nagios-devel-
> >> admin at lists.sourceforge.net] On Behalf Of Bob Ingraham
> >> Sent: 11 May 2006 15:08
> >> To: Sam Stickland
> >> Cc: nagios-devel at lists.sourceforge.net
> >> Subject: RE: [Nagios-devel] Defining services at runtime
> >
> >
> >> >
> >> > * Create for existing services
> >> >
> >> > I notice that Nagios-db gets it's configuration information from the
> >> > following callback:
> >>
> >>
> >> Which callback were you thinking of?
> >
> >The message got sent too early first time around. The second message
> >didn't
> >mention this :)
> >
> >> > * Create a new service check
> >> >
> >> > nebstructs.h defines a struct "nebstruct_service_check_struct".
> >However,
> >> > this seems to be the only place this struct is referred to in the
> >header
> >> > files. How do I pass a completed struct to Nagios?
> >> >
> >> > It looks reality straight forward to work out how to fill out this
> >> struct,
> >> > but "char *host_name;" could be a problem. The plugin is only going to
> >> > know
> >> > the host address, so I'll need a way to get a hostname from an
> >address.
> >>
> >> You can't add a service to Nagios using the
> >> nebstruct_service_check_struct; in fact you can't add anything to Nagios
> >> using any of the nebstruct_* structure.  They are one-way, informational
> >> only - passed down to your module.  When your module returns, Nagios
> >never
> >> examines the structure that it passed to you for changes.
> >>
> >> The way to add a service from within a NEB module would be to call the
> >> internal "add_service()" function.  It's the same one that Nagios uses
> >to
> >> add services during configuration load.
> >>
> >> The API for the add_service() function is:
> >
> >OK, that makes sense. Of course, the need to get the host_name from the
> >host
> >address still remains.
> >
> >> However, you have a significant problem with your above strategy:
> >
> >
> >> So, you have a timing issue:
> >
> >> One strategy might be to have your service_check either:
> >>
> >> - Return the list of services it wants created as a result string
> >> (although, you might not have enough space to do so on one line,) and
> >then
> >> have your callback routine create services based on the contents of the
> >> results string, or
> >>
> >> - Your service check writes it results to a temp file or IPC message
> >queue
> >> or some such, and your callback routine then reads this file (or from
> >the
> >> message queue,) and creates the services based upon that information
> >> source.
> >>
> >> I'm sure that there are many other ways to do this...
> >>
> >> Anyway, anyone please correct me if I'm off on any of this, but that's
> >how
> >> I understand the way the callback routine mechanism works.
> >
> >Yes, I understand the issue here. The code here
> >
> >http://www.louisville.edu/~tjande01/nagios/exthandler.c
> >
> >uses a schedule_new_event callback that executes once a second in order to
> >handle the socket code. Personally, I'd prefer to spawn a new thread to
> >handle the socket communication with the check-command. This ties into the
> >last thing that got missed off my original email that is:
> >
> >* Submit passive service check results
> >
> >The old school method of doing this is via the external command file, but
> >I
> >presume the new API has a method of doing this? There's some functions in
> >broker.h that look like likely candidates, but they don't even have basic
> >comments ;) (e.g. broker_service_check).
> >
> >The check-command that reports back to the broker module would only return
> >state based on its ability to reach the switch and to talk to the broker
> >module.
> >
> >Sam
> >
> >
> >
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> >_______________________________________________
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> >Nagios-devel at lists.sourceforge.net
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> >

-- 
How many weeks are there in a light year?
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