Ubuntu 20.04
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NTP Server : Configure NTP Client2020/04/27

Configure NTP Client.
A NTP Client [systemd-timesyncd.service] is running by default on Ubuntu, so it's easy to set NTP Client.
By the way, it's also possible to use NTPd or Chrony as a NTP Client. If you use them, simply set only NTP server to sync time, do not set permission to receive time sync requests from other Hosts.
[1] Configure [systemd-timesyncd.service].
systemctl status systemd-timesyncd

*  systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; ve>
     Active: active (running) since Mon 2020-04-27 01:20:36 UTC; 2min 6s ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 662 (systemd-timesyn)
     Status: "Initial synchronization to time server (ntp.ubunt>
      Tasks: 2 (limit: 4621)
     Memory: 1.5M
     CGroup: /system.slice/systemd-timesyncd.service
             +- 662 /lib/systemd/systemd-timesyncd

vi /etc/systemd/timesyncd.conf
# add to the end : set NTP server for your timezone

systemctl restart systemd-timesyncd
timedatectl timesync-status

       Server: (dlp.srv.world)
Poll interval: 1min 4s (min: 32s; max 34min 8s)
         Leap: normal
      Version: 4
      Stratum: 2
    Reference: 3DCD7882
    Precision: 1us (-25)
Root distance: 7.964ms (max: 5s)
       Offset: +6.050ms
        Delay: 412us
       Jitter: 0
 Packet count: 1
    Frequency: +92.800ppm
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