[CentOS] NTP and hardware clock
Dag Wieers
dag at wieers.com
Wed Oct 11 17:22:43 UTC 2006
On Wed, 11 Oct 2006, Kirk Bocek wrote:
> Kirk Bocek
> Dag Wieers wrote:
>
> > I had the following problem today. Because of a misconfigured
> > network switch one system suddenly didn't have any network.
> >
> > After a reboot (with the network still unavailable) NTPD refused to start.
> > Most likely because the initial ntpdate failed to work. I find this
> > troubling, because when the network was restored, NTPD could have resumed
> > working (like I'd expect from a true daemon).
> >
> > Now, what was more peculiar was that the hardware clock was completely
> > off. I also had assumed that somehow the hardware clock was kept in sync,
> > but now after rebooting without network, the system clock was skewed.
> >
> > Is there some way to:
> >
> > + Make ntpd run, even when no ntp-server could be contacted
> > + Make ntpd synchronise the hardware clock automatically
> >
> > PS Yes, I know I can run ntpdate from cron or run hwclock to synchronize
> > my hardware clock. But shouldn't this be part of the infrastructure
> > (either ntpd or the initscripts) ?
> >
> > Maybe this is useful to have fixed upstream, but I prefer to hear second
> > opinions before trying to be smart :)
>
> Do you have the following lines in your /etc/ntp.conf:
>
> server 127.127.1.0 # local clock
> fudge 127.127.1.0 stratum 10
>
> They identify your local clock as a low-stratum time server.
I fail to see how that is relevant, since the local clock is wrong after a
reboot without network (so I rather not want to use it as a source :)) and
ntpd is not even started because ntpdate fails.
But yes, I do have something like that (stratum 13 though).
Kind regards,
-- dag wieers, dag at wieers.com, http://dag.wieers.com/ --
[all I want is a warm bed and a kind word and unlimited power]
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