Number of Nagios Processes Distributed Monitoring

[Mike Benoit]

I'm having the exact same problem with Nagios 1.1. There hasn't been any
official fix for this released yet correct? It sure makes using passive
checks difficult. :(

On Fri, 2003-07-25 at 09:56, Mooney, Ryan wrote:
> I had a simular problem when doing lots of external checks.  The sub process that
> gets forked to read the results from the .cmd pipe and then write them to the shared
> fd to the master process would block (forever) on the write call.  I never did figure 
> out why, since the code appeared to be correct.  I ended up putting an alarm around
> the write call and timing it out if it hung to long.  I figured that loosing a few 
> passive checks was worth not having memory fill up & having the machine die.  Based on
> the behavior I saw, I'm not really convinced that the problem is 100% limited to the
> passive checks though, as a very simular set of routines is used by the active checks
> code.
> 
> If you compile nagios with debugging (export "CFLAGS=-g"; ./configure --whatever-options-you-use; make; make install) and then watch the "ps aux" output you'll notice
> that there is one really long running process that takes a fair bit of CPU (which is 
> the good master) and then over time you'll start seeing some other processes that have
> a start time a fair bit in the past that never die.  If you attach to one of these with
> a debugger (say "cd /wherever/you/compiled/nagios/; gdb base/nagios [pid]" where [pid] 
> is the process ID of one of the processes with a start time > 1hr ago that is not the 
> master process) and do a "bt" to get a call trace out of it that would likely help 
> determine where the processes are getting stuck.
> 
> If you are having the same problem I was  you will likely see "process_passive_service_checks" and/or "check_for_external_commands" in the call trace 
> (sometimes the stack looks munged so the call stack may not be 100% accurate, leading me 
> to believe that some corruption is whats causing the write to hang, but I wasn't able to 
> figure out what was causing the corruption easily and had to "get things working").
> 
> I'd be curious to see if its the same problem.
> 
> > >Jasmine 
> > I am pretty sure, not nagios itself, but memory ran out and the server
> > stood. 
> > At the moment I have a nagios uptime of : 
> > 
> > Total Running Time: 0d 6h 6m 15s 
> > And this... 
> > Check Command Output:  Nagios ok: located 1677 processes, status log
> > updated 170 seconds ago   
> > 
> > I am pretty sure this is mot ok,
> > 
> > Any Ideas ? 
> > 
> > I will let the server run over the weekend, when it crashes again, I
> > give detailed information to the list. 
> > 
> > 
> > 
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