About a active plugin in local machine

[Harlan Richard C]

Like I said before I have not problem with distributed monitoring. I
know they use passive checks back to main Nagios Host. The problem I
have is for a critical peace of infrastructure is relying on the passive
check to the Host. I prefer active check. The problem with passive check
is you are relaying on the host to update Nagios instead of Nagios
actively polling for information. Like you said below I know if the data
becomes stale Nagios will fore a check on the service. I just prefer to
cut the middle man out of the system and reline on active checks.

Over all Nagios will scale to a very large amount of active service
check in a short amount of time. For the most part most check take very
little system recourses, but the problem becomes you can only do some
many checks in a set time frame. 

Right now our site of Nagios is not the Biggest, we only monitor 495
host with 518 service every three mins. Though we have to be rock solid
and quick, here Nagios is the underdog we had to carve out a nitch for
our self from the likes of Patrol, MOM, HP Open view and sitescope. Over
all I believe Nagios hold it own, in a few cases our little free
services has to be tone back because we were performing services of the
high price monitoring apps. 

Over all I under stand passive checks, I have user them a lot before for
monitoring services and in distributed monitoring, in my option I like
active check better and I like the theory of polling for data instead of
the push modal. I have been using the product sine it was Netsaint 0.7,
over all love this app and the way I can make it work with other
monitoring app. The one thing I was sad to see was when it became Nagios
we lost the little penguin. Again this is all my two cents. 
  

-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of Chris
Wilson
Sent: Thursday, June 23, 2005 4:37 AM
To: Nagios Users
Subject: RE: [Nagios-users] Re: About a active plugin in local machine

Hi Richard,

> Over all I am not a fan of passive
> checks, in my option if the service check is not critical enough to 
> perform a active check but wait for the host, then it is a nice to 
> know but not critical.

Then you probably haven't tried to monitor hundreds of hosts or
thousands of services :-) Active checks do NOT scale. Unless you involve
passive checks at some point (even if it's a Nagios slave server
submitting results to a master by passive checks), as your system grows
it will get slower and slower until it falls over when it reaches a
certain size.

> Though my views are slant to our environment, all web sites, each site

> displays a page giving information of the health of the site. From 
> there we are firm believers if the service is critical we will 
> actively probe it, not waits for it.

Passive checks submitted to the master, backed up by an active check
from the master if the results become stale, are every bit as good as
active checks in my book. Plus they reduce the load on our monitoring
server by an order of magnitude. Since we don't have infinite resources,
that really helps a lot. And we do still get timely alerts of problems.

Cheers, Chris.
--
(aidworld) chris wilson | chief engineer (chris at aidworld.org)



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::: Messages without supporting info will risk being sent to /dev/null