NRPE: Unable to read output; but works when run under strace ...

[Eliezer Croitoru]

I would try to run a basic script which logs the nrpe environment into a 
file.
it will make sure what is available to you and what not.

test if:
there are environment vars..
there is a STDOUT\IN\ERR available etc..

#!/usr/bin/env ruby
f = File.open("/tmp/nrpetest.log","a")
f.sync = true

f.puts "ENVIROMENTAR VARS\n==========="
ENV.each {|k,p| f.puts "#{k} = #{p}"}

f.puts "STD DATA\n=========="
f.puts "stdout exists?: #{$stdout}"
if $stdout

f.puts "stdout is tty?: #{$stdout.isatty}"
begin
   $stdout.write_nonblock "0"
   f.puts "Wrote 0 to stdout"
rescue => e
   f.puts "didnt wrote to stdout"
   f.puts e.message
   f.puts e.backtrace.inspect
end

end

modify the above to make sure what is the cause of this problem.
you can also try to access stdout\err

Regards,
Eliezer

On 1/8/2013 3:53 PM, Florian Ernst wrote:
> Hello all,
>
> following up to myself ...
>
> On Mon, Oct 08, 2012 at 08:31:21PM +0200, Florian Ernst wrote:
>> [...]
>> However, it got weirder: if I strace the nrpe process, everything works
>> as desired:
>> [...]
>> I found no further hints in the strace log, but this led me to assume
>> that there is some NRPE weirdness involved, and thus I'm writing here
>> instead of further digging through the system.
>>
>> Any ideas?
>
> Lacking any further clue as to what peculiarity might be responsible for
> this weird behavior, I decided to simply let the nrpe process
> permanently run under strace like
> strace -f -q -e none -o /dev/null ...
>
> The performance impact is minimal, and I finally get check results. Not
> really a solution, but it'll do.
>
> Cheers,
> Flo

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