[Nagios-devel] More passive problems

[Erik Larkin]

You might want to look at "command_check_interval" in nagios.cfg.  I have a
huge number of passive checks coming in as well (via nsca), and I found that
leaving it at -1, which equates to "check as often as possible", didn't
check often enough.  Consequently my pipe size would hit the kernel maximum
(linux redhat) pretty quickly, and all new incoming nsca connections would
hang until nagios cleared the pipe.  I set the command_check_interval to 1s,
and it seemed to help a good deal.  You can also increase the allowed
maximum size of a pipe, but for redhat at least that requires recompiling
the kernel.

-----Original Message-----
From: Dan Rich [mailto:drich at employees.org]
Sent: Saturday, May 10, 2003 12:20 PM
To: nagios-users at lists.sourceforge.net;
nagios-devel at lists.sourceforge.net
Subject: [Nagios-devel] More passive problems



I am concerned with the way Nagios appears to handle passive alerts.  As I
mentioned before, I am using a script to monitor a system farm of several
hundred machines.  Every five minutes this script submits passive checks for
each machine into Nagios.

Doing the above I frequently see many (for large values of many, sometimes >
100) of Nagios processes that are blocked on a lock file in the var
directory.
 It looks like this is due to the process that is reading the passive checks
from the named pipe.  However, this has frequently led to system loads over
100, and this morning brought the system to a griding halt.

Does anyone have any idea why the passive checks are causing this problem?
If
I stop the cron job that generates the checks and restart Nagios the load
goes
away and doesn't return.  By whole point in doing this in the first place
with
passive checks was to avoid the load on the system caused by hundreds of
processes having to run every few minutes, but that seems to have backfired.

-- 
Dan Rich <drich at employees.org> |   http://www.employees.org/~drich/
                               |  "Step up to red alert!"  "Are you sure,
sir?
                               |   It means changing the bulb in the
sign..."
                               |          - Red Dwarf (BBC)



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