Date/Time synchronization

[mitu]

@joecool said in Date/Time synchronization:

I'm connected to internet. Does the Rasperry synchronize its time at boot ? and how ?

It uses NTP to synchronize it's date/time using the internet.

[JoeCool]

@mitu Ha ? I saw that ntd was not use anymore and maybe timedatectl was used in place.

[mitu]

@joecool timedatectl is only setting/reading the date, does not speak NTP. You're probably thinking about systemd-timesyncd, but I don't think that's installed in Raspbian.

[JoeCool]

@mitu You're probably right. My problem is to know how this sync works. I'm sorry, but there is a blur in my mind about that time sync.

Concretely, can we list, please, each step (init.d, service, etc...) responsible to the sync time process during the Raspbian start ?

I will be nice for me ;) !

[mitu]

@joecool said in Date/Time synchronization:

My problem is to know how this sync works.

Via NTP (either using ntpd or systemd-timesyncd, both speak the same protocol). I don't have a PI at hand to check, but I think you can check the list of systemd running services and see if ntpd is enabled.

[JoeCool]

@mitu yep, only systemd-timesyncd.service is enabled...
Could I say to my new service to wait for the launch of systemd-timesyncd.service ?

[mitu]

@joecool said in Date/Time synchronization:

Could I say to my new service to wait for the launch of systemd-timesyncd.service ?

Yes.

[JoeCool]

@mitu Add "After=systemd-timesyncd.service" (in the [Unit] section) into my <blabla>.service file, right ?
I will try now...

[JoeCool]

@joecool said in Date/Time synchronization:

@mitu Add "After=systemd-timesyncd.service" (in the [Unit] section) into my <blabla>.service file, right ?
I will try now...

It does not seem to work (with After=...). I tried with systemd-timesyncd.service, time-sync.target and sysinit.targetbut no one works... Strange !!

The time is always the last known... that at the moment of the shutdown.

I continue to search... If you have any idea, will be cool.

[mitu]

Instead of strictly depending on the timesyncd service, try making your service depending on the network target , otherwise the time service doesn't have a chance to do any synchronisation. Add a delay before the service starts using the ExecStartPre to run sleep for 2-3 seconds.

[JoeCool]

@mitu said in Date/Time synchronization:

epending on the timesyncd service

Good idea, I'm going to try that. Thanks.