Re: Suggested clockspeed/taiclockd invocation at boot

Darren Spruell <[email protected]> wrote:
> Then what might work would be to add to /etc/rc.local:
>
>   taiclock `dnsip my.taiclockd.server` |clockadd
>
> And have svscan monitor an appropriate run script that can launch
> clockspeed and keep it running.

Right.

> With clockspeed running in the background, will it periodically
> adjust the time, or is this only accomplished when clockadd is
> executed?

clockadd sets the clock immediately to a particular time, so it is
discontinuous: you can have gaps or repeated intervals in your clock.
clockspeed makes the clock run fast or slow so it gradually reaches
the correct time.

If you run clockspeed on the slaves, and feed it (via
/usr/local/clockspeed/adjust) with a couple of taiclock measurements
spaced apart, clockspeed will keep their clocks from drifting too
much.  However, they will probably still drift a little.  And if the
clock is off when clockspeed first starts (or is restarted),
clockspeed won't have any way of knowing, so it won't correct that.
So you should give clockspeed further taiclock measurements on a
regular basis.  Hence the extra complications of the scripts on
Frank's site.


paul