Active vs. passive checks; host won't check

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Steve Yates
> Sent: Thursday, February 01, 2007 1:46 PM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Active vs. passive checks; host won't check
> 

[chop]

> 	I have two questions, and the first may help to answer the
> second.  I've never been too sure about the difference between active
> and passive checks.  What is the difference?  Is there a correct time
to
> use one or the other?

Active checks are initiated by nagios itself. The plugin runs on your
nagios machine and actively checks the status of some service. Passive
checks are received by nagios from an external source and not initiated
by nagios. Passive checks are often utilized in distributed monitoring
where you may have one or more other nagios installations performing
checks and sending the results of those checks back to a central nagios
server. Another use for passive checks would be to receive check results
from a script that is running on a machine that isn't directly
accessible by nagios due to a firewall or other circumstance.
 
> 	I have one host (a router) that will not check.  Status=PENDING
> ("Host has not been checked yet") forever.  Active and passive checks
> are both enabled.  It is a router, so there are no other services.
Also
> I used Monarch to clone it from another router's host definition that
> was working.  Any ideas on why it wouldn't be checking?  I can ping
it's
> IP.

Under normal configurations, hosts are never checked until a service on
the host fails. No service, no host checks ever. You must define at
least one service for every host if you want it to be checked. This
requirement is likely to change with nagios-3.

--
Marc

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