[Arm-dev] Re: System time

[Robert Moskowitz]

On 09/01/2015 01:15 PM, Nicolas Repentin wrote:
>
>
> Oh, I did know about systemd-timesyncd, need to check about it :-)
>

Again from the Fedora-arm list:

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..

This should be easy to add to the image build process.  Even better an 
mSD burn script like the Fedora-installer script.


>
>
>
> Nicolas Repentin
>
> <nicolas at shivaserv.fr>
>
> --------- Original Message ---------
> *From*: Robert Moskowitz
> *To*: Conversations around CentOS on ARM hardware
> *Date*: Tue Sep 01 19:04:38 GMT+02:00 2015
> *Subject*: Re: [Arm-dev] System time
>
>
> On 09/01/2015 12:16 PM, Nicolas wrote:
>> Hello
>>
>> I don't think any armv7 board like cubie has a battery to backup clock
>> I think ntpd is the only way, and seems to work well on my bpi with 
>> c7. I will check if dns resolution works when date is 1970.
>>
>> I think setting the currenttime can be a good idea on the rbf tool :-)
>
> On the Fedora-arm list I was pointed to Systemd-timesyncd
>
> This does MOST of what I want.  All that I think needs to be added is 
> for it to be enabled in the image and a initial date/time of the image 
> built date be there so the firstboot has a decent time.
>
>>
>> Nicolas Repentin
>> <nicolas at shivaserv.fr>
>>
>>
>> Le 1 septembre 2015 18:12, Robert Moskowitz a écrit:
>>> How is system time set at boot?  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 back 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.
>>>
>>> Opinions?
>>>
>>>
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>>
>>
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