On Fri, Feb 09, 2018 at 03:18:08PM +0100, Ariel Garcia wrote:
> Assuming the servers are reachable/fine, would a short connection time of 
> 2-3 seconds twice per day be enough to keep synchronized, or should i rather 
> enforce some minimum "on" time? (no big precision required, just within 1s)

That should be ok. 1 second per 12 hours is a frequency error of 23
ppm. Unless the clock on the board is very unstable, its error should
stay well below that.

> server SERVER1/2/3 auto_offline offline iburst presend 10 minpoll 4
> initstepslew 3600 SERVER1/2/3

If you don't need chronyd to block the boot sequence until the clock
is stepped I'd suggest to drop the initstepslew directive

> makestep 3600 2
> fallbackdrift 13 19
> driftfile /var/lib/chrony/sysclock.drift
> dumpdir /var/lib/chrony/history
> dumponexit

That looks ok.

-- 
Miroslav Lichvar

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