[CentOS] NTP and hardware clock
dag at wieers.com
Wed Oct 11 17:41:18 UTC 2006
On Wed, 11 Oct 2006, Kirk Bocek wrote:
> Dag Wieers wrote:
> > 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).
> I somehow thought that ntpdate might be trying to access an unavailable time
> source. With these lines, you always have a time source available, even if it
> is inaccurate.
The whole point of ntpdate is to synchronize the local clock with another
source (ie. not the local clock).
And I guess the main reason why they do not start ntpd if ntpdate fails,
is because they have to protect other ntp clients from being poisoned by
a wrong system clock upstream (because its source is unavailable).
So maybe using ntpdate from cron is better than using ntpd. If only there
was some infrastructure so configuring ntpdate would be done in a
Maybe that would be a nice feature request for Red Hat. Add a cron-job
that works if some /etc/sysconfig/ stuff is available.
-- dag wieers, dag at wieers.com, http://dag.wieers.com/ --
[all I want is a warm bed and a kind word and unlimited power]
More information about the CentOS