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Synchronisation heure Raspberry

Former Member

Bonjour,

 

Je sollicite votre aide pour répondre à une question dont je n'ai pas la réponse et qui me semble extrêmement bizarre.

 

Nous avons fais l'acquisition de plusieurs Raspberry Pi de type B il y a quelques mois.

 

Le problème est que la date du Raspberry ne se mets absolument pas à jour comme il se doit. Nous nous sommes rendu compte il y a quelques jours que le Raspberry avait 3 jours de retard

 

Nous avons donc contacté les services techniques de nos fournisseurs qui nous ont redirigé ici.

 

Je leur ai demandé si le Raspberry avait une pile comme tout pc normalement constitué, mais apparemment le Raspberry Pi n'a aucun BIOS.

 

Ceci dit, nous avons configuré l'heure correcte manuellement en ligne de commande puis rebooter le Raspberry, et là surprise, il ne conserve pas la date qu'on lui a fixé, il se remets avec 3 jours de retard.

 

Apparemment le Raspberry ne se synchronise pas avec le serveur NTP ...

 

Auriez-vous une idée concernant l'origine du problème ?

Et comment pourrait-on le résoudre ?

  • 0

    My French is insufficient to be writing it, I hope you'll be able to read my English...

     

    Indeed the raspberry pi does not have a battery, and therefore no "realtime clock". You could buy a battery-and-real-time-clock to solve your problem.

     

    On the other hand, during boot most raspberry pi's are configured to contact an NTP server for an immediate time-update, and then try to synchronize with the NTP server from then on. Do you have the ntp and ntpdate packages installed? Can you trace if there are any NTP packets going back and forth by using   tcpdump -ni eth0 port ntp ?

    (it would be great if you could do the trace on your router so that you can see what happens during boot!)

     

    Do you have the ntpd program running?

    raspberrypi:~> ps auxww |grep ntp
    ntp       2440  0.0  0.4   5512  1712 ?        Ss   Apr09   1:22 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 102:104
    wolff    10367  0.0  0.1   3796   808 pts/0    S+   10:27   0:00 grep ntp
    raspberrypi:~>

  • 0 in reply to rew

    I will write in English, i hope it will be easier for you image

     

    I have the ntpd program which is running

     

    raspberrypi:~> ps auxww |grep ntp

    ntp       2440  0.0  0.4   5512  1712 ?        Ss   Apr09   1:22 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 102:104

    pi         10367  0.0  0.1   3796   808 pts/0    S+   10:27   0:00 grep ntp

    raspberrypi:~>

     

    When I configured an static ip address on my Raspberry and reboot, the date was synchronize.

     

    To my mind, it's a network issue because i was in DHCP mode and the Raspberry wasn't synchronize.

     

    What do you think about this ? Any ideas ?

     

    How can i see the logs of my ntp server ?

  • 0 in reply to Former Member

    Based on your description I would suspect your DHCP server is not providing all the correct parameters to the PI

     

    Specifically the DNS servers. Often consumer routers will default the DNS server to itself or the one supplied by the ISP (Visible on the WAN configuration page). There is nearly always an option on the router to configure a custom DNS server to override or augment the feature.

     

    Compare the static configuration your using to the properties provided by the DHCP server and you will probably see the difference.

     

    try adding the DNS server used in static configuration to the router DHCP properties and hopefully it will resolve your issue.

     

    The only other possibly I can think of though less lightly is the default gateway setting. you can view this is the same way as seeing the DNS information

    you may already know how to view the PI settings but this may help if not

     

    raspbian - Easiest way to show my IP address? - Raspberry Pi Stack Exchange

    Regards

     

    Peter

  • 0 in reply to Former Member

    Ah!!! Now I remember!

     

    IIRC, there is a bug in raspbian.... The NTP synchronization might happen before DHCP is completed!

  • 0

    I have found this to also happen.  If the Pi is rebooted the time is synced and the internet works.

  • 0

    I found this product on the Kubii's website :

     

    http://www.kubii.fr/ab-electronics/360-module-horloge-rtc-alarm-pi-temps-reel-3272496000964.html

     

    It seems the solution, but there is one problem : the price. It's very expensive to my mind, the same price as the Raspberry Pi ...