[fedora-arm] System time

[Robert Nelson]

On Tue, Sep 1, 2015 at 12:03 PM, Robert Moskowitz <rgm at htt-consult.com> wrote:
>
>
> On 09/01/2015 12:14 PM, Robert Nelson wrote:
>>
>> On Tue, Sep 1, 2015 at 11:10 AM, Robert Moskowitz <rgm at htt-consult.com>
>> 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
>
>
> Thanks!  I see that this DOES work even when no network.  It would be good
> if the images came with this enabled and with the time set to the build
> date/time, so we had a better starting time a firstboot.

One little trick i've been doing before first boot:

touch /<mount>/var/lib/systemd/clock
chown systemd-timesync:systemd-timesync /<mount>/var/lib/systemd/clock

Then systemd-timesyncd.service will use that time stamp..

Regards,

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