Increasing max_pluginoutput_length

[Peter Kostik]

Thanks for a tip. You're right. I tested it with
nonexistent cmd file and was able to receive full 2k
plugin output on Nagios box (in the alternate
nsca.dump file). So now I know that problem is with
Nagios. I'll try to poke around the code to see if I
can figure it out.

Thanks again.

--- Subhendu Ghosh <sghosh at sghosh.org> wrote:

> Sorry - missed the nagios mod.
> 
> Have you tried pointing nsca.cfg to a non-exisitent
> cmd file and specified 
> an alternate dump file and checked the results?
> 
> -sg
> 
> On Thu, 21 Jul 2005, Peter Kostik wrote:
> 
> > Thanks for a quick reply. However, as I stated in
> my
> > original post, I did change
> MAX_PLUGINOUTPUT_LENGTH in
> > both nsca and nagios to 2k. I also changed
> > MAX_INPUT_BUFFER from 2k to 8k in nsca.
> >
> > Pete
> >
> > --- Subhendu Ghosh <sghosh at sghosh.org> wrote:
> >
> >> nagios/include/objects.h
> >> objects.h:#define MAX_PLUGINOUTPUT_LENGTH
> >>            348
> >>
> >> Nagios itself has a limit - that can be changed
> as
> >> you are doing for NSCA
> >> - provided all your platforms support the size as
> >> less than PIPE_BUF
> >>
> >> -sg
> >>
> >> On Thu, 21 Jul 2005, Peter Kostik wrote:
> >>
> >>> My monitored system is Solaris 8. From limits.h:
> >>>
> >>> PIPE_BUF       5120                         /*
> max
> >> #
> >>> bytes atomic in write to a pipe*/
> >>>
> >>> As you can see ~5k is more than enough for my
> 1.8k
> >>> plugin outputs. Nagios host is RHEL4 and as you
> >>> pointed out correctly PIPE_BUF is 4k, but I
> don't
> >>> think it matters b/c message comes to Nagios
> >> truncated
> >>> to 937 bytes. This is how I send alarms in my
> >> plugin
> >>> via send_nsca (perl):
> >>>
> >>> open(NSCA,"|$notifyCmd") or die ("ERROR: Cannot
> >> pipe
> >>> to $notifyCmd: $!");
> >>> print NSCA $notifyMsg;
> >>> close(NSCA);
> >>>
> >>> Anyone has similar problem or can think of a
> >>> workaround?
> >>>
> >>> Thanks,
> >>> Peter
> >>> --- Subhendu Ghosh <sghosh at sghosh.org> wrote:
> >>>
> >>>> On Mon, 18 Jul 2005, Peter Kostik wrote:
> >>>>
> >>>>> Hello all,
> >>>>>
> >>>>> by saying what an incredibly superior product
> >>>> Nagios
> >>>>> is, I will be probably repeating hundreds of
> >>>> others
> >>>>> that use it and love it, so let me get to the
> >>>> point.
> >>>>>
> >>>>> I am running 2.0b3 to monitor thousands of
> >>>> services on
> >>>>> hundreds of servers, using mainly passive
> checks
> >>>>> (nsca/send_nsca) and of course nrpe/check_nrpe
> >> to
> >>>> make
> >>>>> sure things are running as they should.
> >>>>>
> >>>>> Some of my plugins return long outputs (2k)
> via
> >>>>> send_nsca. So what I did is increase
> >>>>> MAX_PLUGINOUTPUT_LENGTH in common/common.h in
> >> nsca
> >>>>> addon and also in core nagios in
> >>>> include/objects.h. I
> >>>>> believe original value was something around
> 300
> >>>> bytes
> >>>>> so I bumped it up to 2k. However, my plugin
> >>>> outputs
> >>>>> still get truncated at around 800 bytes (don't
> >>>> know
> >>>>> exact value of top of my head). Had anyone
> >> played
> >>>>> around with changing these values and got it
> >>>> working
> >>>>> right? I am wondering if there is another
> limit
> >>>> set
> >>>>> somewhere else that overrides this.
> >>>>>
> >>>>> Thanks for the great product.
> >>>>>
> >>>>> Pete
> >>>>>
> >>>>
> >>>> There is system limit for a named pipe buffer.
> >>>> check your os' limits.h for PIPE_BUF
> >>>>
> >>>> RHEL4 defaults to 4096 characters, but linux
> used
> >> to
> >>>> have a smaller buffer
> >>>> hence the general size restriction in Nagios.
> >>>>
> >>>> --
> >>>> -sg
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
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> 
> 



		
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