| Re: [chrony-users] Re: Linux time goes wrong after changing the time with 'date' cmd |
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- To: Bill Unruh <unruh@xxxxxxxxxxxxxx>
- Subject: Re: [chrony-users] Re: Linux time goes wrong after changing the time with 'date' cmd
- From: Feng Tang <feng.tang@xxxxxxxxx>
- Date: Mon, 13 May 2024 20:36:47 +0800
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- Cc: <chrony-users@xxxxxxxxxxxxxxxxxxxx>, Miroslav Lichvar <mlichvar@xxxxxxxxxx>
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On Mon, May 13, 2024 at 04:00:33AM -0700, Bill Unruh wrote:
>
> On Mon, 13 May 2024, Feng Tang wrote:
>
> > [CAUTION: Non-UBC Email]
> >
> > Hi Miroslav Lichvar,
> >
> > On Mon, May 13, 2024 at 08:19:07AM +0200, Miroslav Lichvar wrote:
> > > On Mon, May 13, 2024 at 09:02:31AM +0800, Feng Tang wrote:
> > > > So my thought is, since user already chose to trust 'chrony', and
> > > > when chrony has more realiable NTP time source, 'chrony' can help to
> > > > correct the 'wrong date' set by user with the right time, practically
> > > > 'rejecting' the huge time jump set by users.
> > >
> > > chronyd is trying to correct the clock, but a typical default
> > > configuration provided with distro packages allows steps only on
> > > start, so the ~10% slew can take very long time.
> >
> > Yes, exactly. In the above case, we saw the system time was compensated
> > very slowly.
>
> It slews at 1 sec per 10 sec. if the clock is way out.
Got it, thanks
> >
> > >
> > > The user would need to allow steps at any time. See this answer in
> > > the FAQ:
> > > https://chrony-project.org/faq.html#_is_chronyd_allowed_to_step_the_system_clock
> >
> > This works great in my test and the issue can't be reproduced. Many
> > thanks for the hint!
>
> BUT you have to tell you users NOT to change the clock on their own. DO NOT
> USE date to change the clock. If your users are going to do idiotic things
> there is nothing you can do to correct all of their idiocies. Do not do it "as
> a test" It is not a test. Nothing will ever make the clock suddeny jump
> time. NOt allowing your clocks to jump may well produce worse things that
> you are
> complaining of now.
Sure, will communicate about that.
Thanks,
Feng
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