Host (not really) DOWN alert for ....

[Tedman Eng]

Hosts don't go into "soft" down states.  Only services do.  If your
host-check-alive command is a ping, set up a service-check using ping for
the host (you're probably already doing this). Then view the
trends/alerts/history/etc for the service, rather than the host.  The
service-check ping would have to fail before the host-check ping fails.  If
the service-ping fails only sometimes, but the host-ping seems to fail every
time the time its invoked, consider tuning the host-check-alive command by
increasing or decreasing the number of packets sent (look for the -c option
in the definition).

Also, just to be safe - stop nagios, look for and kill any rogue nagios
processes, then start.
Sometimes these 'phantom' processes can cause weirdness.


"Damian Gerow" <damian at sentex.net> wrote in message
news:20031106063407.GB78425 at sentex.net...
> Twice in the past couple of days, we've gotten an alert for a box that was
> 'down'.  Each time, I checked the availability of the machine, and it was
> most definitely up -- my SSH session hadn't disconnected, and the remote
> machine was fully responsive.
>
> Thinking something amiss, I checked the performance stats of nagios.
21.4%
> of checks complete in under 1 minute, and 100% of 182 complete in under
> five.  It takes no more than 10 seconds to complete a check, with <1s
> 'check latency'.  This might not be as good as it could be, I have yet to
> fine-tune our setup.  But it doesn't seem horribly bad.
>
> So I started looking at the history of this host, and lo and behold, it
> apparently has never gone down in the past week.  Yet I have two sets of
> e-mail alerts (down/up pairs), one from Nov 3, and the other from Nov 5.
>
> Is there something I'm missing?  Or do small blips not make it into the
> reporting?  I've checked trends, availability, and alert history.  None of
> them record this host even going into a *soft* down state, let alone a
hard
> down state.
>
> FWIW, we're using Nagios 1.1 on a RH9 Linux machine.  Nagios is compiled
> from source, not installed via RPM.  We're using SQL to retain history.
>
>
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