This is more of a note to self, as I assume and hope that you aren’t making
the same mistake I did. I have a couple of NTP servers running here, and
I obviously monitor them. The only thing I was doing (and I hope that isn’t
the only thing you are doing) was checking that the process (ntpd
) is
running. I was kindly informed by Michael that the clock on my SixXS
gateway was somewhere about 120 seconds off. Impossible, I thought: the
ntpd
on that machine is up! Well, whaddaya know: the clock had drifted,
although I don’t know why that happened. Anyhow, I’ve updated by monitoring
configuration to check on the actual offset reported by the ntpd
on that
particular machine. Since I use Nagios/Icinga, the recipe is simple enough
with the included check_ntp_time
plugin. As is usual in IT,
Murphy is right.
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