[CentOS] NTP and hardware clock

Kirk Bocek t004 at kbocek.com
Wed Oct 11 17:06:57 UTC 2006

Do you have the following lines in your /etc/ntp.conf:

server     # local clock
fudge stratum 10

They identify your local clock as a low-stratum time server.

Kirk Bocek

Dag Wieers wrote:
> Hi,
> 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 :)
> 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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