pkill -HUP nagios = Dead box

[Patrick Morris]

I've been having an issue with multiple Nagios installations over a span
of a few years, and after setting up another installation over the last
few months it's biting me again.

Sometimes, but not always, issuing a HUP to Nagios causes bad things to
happen.  The configuration won't reload (for example, new services don't
appear in the web interface), and the Nagios socket stops accepting
input.  In the case of my current installation, this means that I get a
crapload of hung NSCA processes from the external boxes that submit
checks for ~4000 services to the "master" box.

Withing an hour or so, this'll pretty much take out the master as the
number of waiting NSCA processes exhausts the server's file handles.  If
not caught in time, it takes a server reboot to recover.

I'm working around it by training people *not* to send HUPs to nagios,
and do full reloads, but I'd love to figure out why this happens and/or
if it can be fixed.


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