Marc Powell a écrit:
On Feb 23, 2009, at 9:43 AM, Sergio Ariel wrote:
My problem is that when these host are DOWN, Nagios wait 30 seconds
trying to execute the service check. After this 30 seconds, then
tell me
"CRITICAL SERVICE". I want to avoid Nagios checks any service in
DOWN
Nagios isn't designed to do this; you'll need to jump through hoops to
accomplish it. At the least you need to be running nagios-3 with
active host checks configured. I'd suggest you look at creating an
event handler for your hosts that issues the external command
'DISABLE_HOST_SVC_CHECKS' when the host is non-OK and issues the
external command 'ENABLE_HOST_SVC_CHECKS' when the host recovers.
Hi,
I already posted the same problem some months ago.
I tried Mark's workaround using event handlers and external commands. I
also tried another smart workaround using service dependancy. You
create a 'check_host_alive' explicit service, then you create a service
dependancy, so that all your other services are not checked if the main
service fails. Using wildcards can be helpful. Search my name 'OTTAVI'
in the list history, and you'll find more details about these two
workarounds.
Anyway, both of these workarounds do not completely solve the problem.
If some service checks are scheduled BEFORE the event handler triggers,
or before the dependancy operates, then these service checks will return
'FAILED' status. Some optimization can be done by reducing check
interval for the 'parent' check_alive service, but you will still get
some 'FAILED' status for some checks that are scheduled before...
I'm having this trouble for months, but I didn't find any suitable solution.
Nagios has a 'parent/child' relationship system, which could be helpful
in such a situation. But it works only for hosts. There are no
parent/child relationship between services, or between hosts and
services, which could solve our problem completely ! Let's hope the
developpers will take our problem into consideration for future versions.
Another idea of a better workaround would be using an event handler, not
to only to disable all service checks, but also to put all of them in an
'UNKNOWN' state (this would simulate the parent/child/unreachable
logic). Then, even if the event handler trigger AFTER some (failed)
service checks, the 'FAILED' status would be replaced by a more accurate
'UNKNOWN' status. Unfortunately, I didn't manage to do that in a script
to be run as an event handler. I don't know if it is possible. But my
global knowledge about scripting is quite poor. Maybe a Perl or Bash
guru could help us writing such a script ?
Kind regards,
--
*Toussaint OTTAVI*
*MEDI INFORMATIQUE*
**
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