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

[Robert Moskowitz <rgm@xxxxxxxxxxxxxxx>]

On 04/20/2017 01:03 PM, Miroslav Lichvar wrote:
> On Thu, Apr 20, 2017 at 12:33:29PM -0400, Robert Moskowitz wrote:
> > This is on Centos7 on arm:
> >
> > In my continuing journey to run a armv7 server with no battery clock, I have
> > been strongly advised on the postfix list that it should NOT start until the
> > system time is after the create time of the running version of postfix.
> The -s option would help with that, but the improved behavior which
> restores time from the driftfile when there is no RTC was added in a
> newer version than is currently available in CentOS.

Well, my target is Centos7.  Where is -s option documented.

> > Adding chronyd.service to the After statement would only delay postfix until
> > chronyd started, not until it set the time (and what if the network was down
> > at startup time?).
> >
> > How might I add a ExecStartPre clause that would delay postfix until the
> > system time was right?
> The recommended way to delay start of a service until the clock is
> synchronized is to add "After=time-sync.target" to its unit file and
> enable the chrony-wait service. It uses the chronyc waitsync command
> to delay the time-sync target.
I was thinking that maybe to delay the login service until this 
happens.  But if the problem is some network config, then you could not 
log in to fix.  Bad idea.  :)



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