check_icmp/check_ping trigger values
Bergström Sebastian
Sebastian.Bergstroem at kunskapsskolan.se
Thu Feb 17 22:16:55 CET 2005
Seems like I've missunderstood something very vital. The difference between service checks and host checks. I honestly don't get it.
So far I haven't separated the two but I realise that I should but I'm still not sure how or why.
When should I use check_host and when should I use check_icmp?
If someone could explain this to me in a simple way I will be most grateful.
//Sebastian
> -----Original Message-----
> From: Andreas Ericsson [mailto:ae at op5.se]
> Sent: den 17 februari 2005 18:18
> To: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] check_icmp/check_ping trigger values
>
>
> Bergström Sebastian wrote:
> > We are using Nagios 1.2 and are evaluating check_icmp as a
> check_ping
> > replacement. Nagios is currently monitoring 21 branchoffices with
> > Cisco switches and routers using 2mBit connections to each site.
> >
> > The reason for replacing check_ping is that it produces critical
> > errors sporadicly. It is pertinent to mention that the
> critical errors
> > only occurs during the first checks and therefore does not send
> > notifications. My mission is to drasticly lower the amount
> of errors
> > occuring to an absolute minimum.
> >
> > What are the most sensible trigger values to use with check_icmp or
> > check_ping?
>
> Short answer (read archives for longer one); For service
> checks, these values should work in most networks with
> normal-to-high load.
> check_icmp -H $HOSTADDRESS$ -w 200.0,40% -c 500.0,60% -i
> 200ms max_check_attempts 3
>
> For host checks;
> # ln -s check_icmp check_host
> check_host -H $HOSTADDRESS$ -i 0.5s -p 10 -t 20 max_check_attempts 3
>
> check_icmp returns immediately upon any received packet when
> called as check_host, so it's safe to use a higher packet
> count and timeout and lower the max_check_attempts
> accordingly (it won't let nagios sit and wait as check_ping does).
>
> Remember that check_icmp must be setuid root to work properly
> on nearly all linux boxen.
>
> > The original Nagios configuration (the same I am using)
> > are: check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c
> 5000.0,100% -p 1 -t
> > 20
> >
> > My definition of sensible in this case is using a value that is
> > producing as few errors as possible, when there are no real
> problems.
> > Not sure if this is a attainable goal or not since I know that some
> > equipment drops ICMP packets if they are to busy.
> >
> > Any views or comments are appreciated.
> >
> >
> > Best regards, Sebastian Bergstroem
> >
> > ---------------------------------------------- Sebastian Bergstroem
> > Technical coordinator Kunskapsskolan i Sverige AB
> > sebastian.bergstroem at kunskapsskolan.se
> > -----------------------------------------------
> >
> >
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>
> --
> Andreas Ericsson andreas.ericsson at op5.se
> OP5 AB www.op5.se
> Lead Developer
>
>
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