Re: [chrony-users] Delaying postfix until chronyd gets the time

[Robert Moskowitz <rgm@xxxxxxxxxxxxxxx>]

Gaining understanding...

On 04/21/2017 06:21 AM, Miroslav Lichvar wrote:
> On Fri, Apr 21, 2017 at 05:59:12AM -0400, Robert Moskowitz wrote:
> > I was looking at the man for chronyd, and saw that the man for 2.1.1 says it
> > uses the drift file:
> >
> >                If  chronyd doesn't support the RTC on your computer or there
> > is
> >                no RTC installed, the system clock will be set with this
> > option
> >                forward  to  the time of the last modification of the drift
> > file
> >                (specified by the driftfile directive)  to  restore the
> > system
> >                time at which chronyd was previously stopped.
> You are right. The difference between 2.1.1 and 2.2 actually is that
> 2.1.1 uses the driftfile only when the RTC is missing. If there is an
> RTC, but it is in the past (e.g. it has no battery to keep the time
> when the system was powered off), the driftfile will not be used to
> restore the system time.
>
> However, you could force chronyd to ignore the RTC by setting
> rtcdevice to a nonexistent device and always use the driftfile, e.g.
>
> rtcdevice /dev/doesnotexist

Where do I get the command, rtcdevice?  It is not on my system. Then how 
do I run it?  Do I add an ExecStartPre= to the chronyd.service file?

And do I create a /etc/sysconfig/chronyd with the single line:

OPTIONS= -s

?


> > What does the rtcsync in chronyd.conf do?
> It tells the kernel to periodically set the RTC to the system time.
> With no battery, that would probably be useful only for reboots.
Got it.

thanks



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