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Synchronize its Linux with NTP server

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fr:Synchroniser son serveur Linux avec NTP en:Synchronize its Linux with NTP server es:Sincronizar su Linux con servidor NTP pt:Sincronizar o seu Linux com o servidor NTP it:Sincronizzare il suo Linux con il server NTP nl:Zijn Linux synchroniseren met de NTP-server de:Ihr Linux mit NTP-Server synchronisieren zh:与 NTP 服务器同步其 Linux ar:مزامنة في لينكس مع ملقم NTP ja:その Linux を NTP サーバーと同期します。 pl:Synchronizacji z serwerem NTP jego Linux ru:Синхронизируйте свой Linux с NTP-сервером ro:Sincronizarea sale Linux cu NTP server he:סינכרון לינוקס שלה עם שרת NTP
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Introduction

It is sometimes necessary to have high precision in the configuration of the time on your machine. Is particularly the case for the good functioning of distributed systems.

So let's study activation and configuration of the NTP client on a system using systemd (Debian 8 / CentOS / RHEL).

Place

First, check the status of the synchronization of the time service : 

$ sudo systemctl status systemd-timesyncd.service
   systemd-timesyncd.service - Network Time Synchronization
   Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; disabled)
   Active: inactive (dead)
     Docs: man:systemd-timesyncd.service(8)

Then make sure that the synchronization via NTP service is No.t active with "NTP enabled: No." et "NFTP synchronized: no". 

$ sudo timedatectl
   Local time: mer. 2016-09-16 09:39:44 CET
   Universal time: mer. 2016-09-16 08:39:44 UTC
   RTC time: mer. 2016-09-16 08:39:44
   Time zone: Europe/Paris (CET, +0100)
   NTP enabled: no
   NTP synchronized: no
   RTC in local TZ: no
   DST active: no
 Last DST change: DST ended at
                  dim. 2015-10-25 02:59:59 CEST
                  dim. 2015-10-25 02:00:00 CET
 Next DST change: DST begins (the clock jumps one hour forward) at
                  dim. 2016-03-27 01:59:59 CET
                  dim. 2016-03-27 03:00:00 CEST

Then edit the file /etc/systemd/timesyncd.conf : 

[Time]
Servers=ntp01.ikoula.com

Start to finish time synchronization service : 

$ sudo systemctl start systemd-timesyncd.service; sudo systemctl enable systemd-timesyncd.service

Votre service NTP est maintenant actif et l'heure se synchronisera avec les Servers NTP d'Ikoula.



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