Ways and tweaks to make nagios more efficient. load average on monitoring host edging up.

[Kyle O'Donnell]

no active host checks

just active service checks (few passive too)

To disable change the host definition/template option active_checks_enabled 0

Host checks are done on demand when any service returns a critical
state (maybe a non-OK state I can't remember).  This is default nagios
functionality.

The update of your host status check results will only happen when a
host check is intiated.  If a service on that host never goes into a
non-OK state it will never execute the host check.  If it does it will
execute a host check, if the host is down it will stop executing
service checks, and use your host check_interval to continue executing
host checks, when the host returns to an OK state service check
processing will begin again.

if you want to have a host alive check that does both ssh and ping i
would suggest writing a wrapper plugin which first executes check_ssh
and upon failure executes a ping:

#!/bin/sh
hostaddress=$1
check_ssh $hostaddress

if [ $? -eq 0 ]; then

echo "ssh up = host up"
exit 0
else

check_ping $hostaddress

fi

On 1/28/09, Rahul Nabar <rpnabar at gmail.com> wrote:
> On Wed, Jan 28, 2009 at 1:32 AM, Kyle O'Donnell
> <kyleodonnell at gmail.com>wrote:
>
>> I use service deps.  Most of my services are nrpe checks and I create
>> a dep on nrpe.  If a check comes back critical (or which ever state
>> you choose to execute the dep) it does an nrpe check,  if nrpe returns
>> critical (or whichever state you choose) it stops executing the
>> services dependant on nrpe.
>>
>> My load is less than 2 on a machine with 800 hosts and 6000 services.
>>
>> Active host checks are disabled.
>
>
> So, you have no active checks at all? Or just no active host checks? I am a
> bit confused. All my checks are active. How does one disable active host
> checks? And then when will the host check be done at all?
>
>
>>
>> As for ping I don't check as a service only a host check which gets
>> executed if any service turns critical.
>
>
> That might be the exact functionality I was thinking of. If I look under
> "Host Status Details for all host groups" I see very recent and regular
> checks being done on all my hosts under the column for "Last Check". Even
> ones that do not have any services critical.
>
> Or will I only see the behavior you describe after I somehow disable
> "active
> host checks"?
>
>
>>
>> You can use check_ssh as the host check command instead of ping if you
>> prefer as well.
>>
>
> Good idea. But I still want ping to fall back on. If ssh fails only then
> ping. Is that logical?
>
> --
> Rahul
>

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