Ubuntu 22.04
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NTP Server : Configure NTP Client2022/04/25

Configure NTP Client.
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 2022-04-25 03:57:18 UTC; 51s ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 525 (systemd-timesyn)
     Status: "Idle."
      Tasks: 2 (limit: 4579)
     Memory: 1.3M
        CPU: 64ms
     CGroup: /system.slice/systemd-timesyncd.service
             +- 525 /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: 85F3EEF3
    Precision: 1us (-25)
Root distance: 9.681ms (max: 5s)
       Offset: +1.833ms
        Delay: 238us
       Jitter: 0
 Packet count: 1
    Frequency: +6.714ppm
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