Re: System time

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On Tue, Sep 1, 2015 at 11:10 AM, Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> wrote:
> How is system time set?  Is ntpdate run after the network is ready? How long
> does it retry waiting for the network to be available?
>
> I have seen a number of challenges becuase the system time is bac at the
> epoch start as there is no battery rtc.  And  I wonder how many armv7 boards
> have a battery to maintain time across boots?
>
> Minimally, a process could right the time, in the proper format, to a file,
> say /etc/currenttime every 5 min and at shutdown.
>
> Then date can be run early in the boot process, piping this file in.  It
> would not be perfect and does not help, much for new installs, but better
> than epoch start.
>
> Plus /etc/currenttime can be at least set to the image build date/time so
> not even firstboot will be at epoch start.

systemd v215+ has a nice feature to take care of this:

systemctl enable systemd-timesyncd.service

Regards,

-- 
Robert Nelson
https://rcn-ee.com/
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