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NTP Server : Configure NTP Client2023/06/14
 
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 NTPsec 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].
root@client:~#
systemctl status systemd-timesyncd 

*  systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; pr>
     Active: active (running) since Wed 2023-06-14 01:18:10 CDT; 19min ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 418 (systemd-timesyn)
     Status: "Contacted time server 217.178.99.126:123 (2.debian.pool.ntp.org)."
      Tasks: 2 (limit: 4639)
     Memory: 1.4M
        CPU: 28ms
     CGroup: /system.slice/systemd-timesyncd.service
.....
.....
root@client:~#
vi /etc/systemd/timesyncd.conf
# add to the end : set NTP server for your timezone

NTP=dlp.srv.world
root@client:~#
systemctl restart systemd-timesyncd
root@client:~#
timedatectl timesync-status 

       Server: 10.0.0.30 (dlp.srv.world)
Poll interval: 1min 4s (min: 32s; max 34min 8s)
         Leap: normal
      Version: 4
      Stratum: 2
    Reference: 85F3EEA4
    Precision: 1us (-24)
Root distance: 15.525ms (max: 5s)
       Offset: +2.284ms
        Delay: 425us
       Jitter: 0
 Packet count: 1
    Frequency: +9.874ppm
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