How to interpret CRC32 errors?
Andreas Ericsson
ae-n0Zl8IkGad4 at public.gmane.org
Thu Aug 4 16:58:13 CEST 2005
Ralph.Grothe-YpEHkxAi6oMehzHBf2RrnA at public.gmane.org wrote:
> Hi,
>
> I would submit the script hadn't I received contemptuous
> reactions by some expert here on last occasion.
>
You're asking people to help you on their spare time. Most of your
questions so far have been either no-brainers that you would have been
able to figure out for yourself had you made the effort, or of the kind
that would take considerable effort to answer properly.
On a sidenote, it's considered very rude to cross-post unless you're
making an announcement of some sort, so please refrain from doing so in
the future.
>
> The script doesn't require higher privileges than the nrpe daemon
> has,
> and it doesn't produce any output (apart from the final oneliner
> indicating the state),
> nor does it attempt to write anywhere.
>
> If I run it at the shell under the uid of the nrpe daemon it
> works fine.
>
Did you log in as the NRPE user or did you just su? su'ing maintains the
environment settings of the old user, which will have effect on some
programs.
>
> $ /usr/local/nagios/libexec/check_hpva.sh
>
> OK: HP Virtual Array "va" on inwo2 all FRUs State Good
>
> Whereas when I run it via check_nrpe I receive the to me
> meaningless CRC32 error.
>
> $ /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c
> check_hpva_INWO2
> CHECK_NRPE: Response packet had invalid CRC32.
>
> In nrpe.cfg it's defined as
>
> $ grep check_hpva /usr/local/nagios/etc/nrpe.cfg
> command[check_hpva_INWO2]=/usr/local/nagios/libexec/check_hpva.sh
>
>
> What's going on here?
>
check_hpva.sh prints something to stderr. This causes the NRPE daemon to
miscalculate the checksum. When the plugin does the same it arrives at
an invalid result.
--
Andreas Ericsson andreas.ericsson-n0Zl8IkGad4 at public.gmane.org
OP5 AB www.op5.se
Lead Developer
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