* Marc Haber <mh+nagios-us...@zugschlus.de> [2012-07-14 21:02]:
> $ ntpq -c pe torres.zugschlus.de
> remote refid st t when poll reach delay offset jitter
> ==============================================================================
> *ptbtime1.ptb.de .PTB. 1 u 1044 1024 377 18.521 -1.513 0.258
> +ptbtime2.ptb.de .PTB. 1 u 903 1024 377 18.132 -1.277 0.373
> -node01.mserverz 85.10.240.253 3 u 651 1024 377 18.721 -7.067 6.829
> zefiris.semidef 192.53.103.108 2 u 490 1024 377 16.496 4.906 0.680
> -evie.fra1.as411 78.47.148.174 3 u 974 1024 377 18.879 4.630 0.616
> +geiger-online.c 81.94.123.17 2 u 556 1024 377 18.200 4.669 0.694
> $ /usr/lib/nagios/plugins/check_ntp_peer -H torres.zugschlus.de --warning=3
> --critical=5 --jwarn=1 --jcrit=2 --twarn=5 --tcrit=5 --swarn=2 --scrit=2
> NTP OK: Offset -0,001 secs, jitter=0,000000, stratum=1,
> truechimers=5|offset=-0,001000s;3,000000;5,000000;
> jitter=0,000000;1,000000;2,000000;0,000000 stratum=1;2;2;0;16
> truechimers=5;5;5;0
> $
>
> Does this mean that the --swarn und --twarn options actually check the
> stratum of the "best" peer of the queried server, not the queried
> server itself?
The --swarn and --scrit options (not --twarn), yes.¹
> And, while we're at it, why is this:
>
> $ /usr/lib/nagios/plugins/check_ntp_peer -H torres.zugschlus.de --twarn=5
> --tcrit=4 -v
> 3 candidate peers available
> synchronization source found
> Getting offset, jitter and stratum for peer 20cf
> parsing offset from peer 20cf: -0,001
> NTP CRITICAL: Offset -0,001 secs,
> truechimers=5|offset=-0,001000s;60,000000;120,000000; truechimers=5;5;4;0
> $
>
> critical?
--tcrit=4 is equivalent to --tcrit=0:4 and tells the plugin to raise a
critical alert if the number of truechimers is outside the range {0..4}.
The (arguably somewhat confusing²) syntax for specifying thresholds is
documented here:
http://nagiosplug.sf.net/developer-guidelines.html#THRESHOLDFORMAT
So, you want to specify --twarn=6: --tcrit=5: or --twarn=@5 --tcrit=@4.
Holger
¹ http://permalink.gmane.org/gmane.network.nagios.plugins/4333
² In his talks, Ton used to quiz the audience about the results of
various threshold specifications in order to demonstrate the need for
a new threshold syntax, as proposed here:
http://nagiosplugins.org/rfc/new_threshold_syntax
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