NTP Server : Configure NTP Client

	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 (/usr/lib/systemd/system/systemd-timesyncd.service; enabled> Active: active (running) since Sun 2025-08-10 19:56:03 JST; 8min ago Invocation: 97c332fd521d4be4b5e925f7b6a4b348 Docs: man:systemd-timesyncd.service(8) Main PID: 338 (systemd-timesyn) Status: "Contacted time server 10.0.0.10:123 (10.0.0.10)." Tasks: 3 (limit: 4635) Memory: 2.1M (peak: 2.9M) CPU: 30ms CGroup: /system.slice/systemd-timesyncd.service ..... ..... root@client:~#  vi /etc/systemd/timesyncd.conf # add to last line : 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: 85F3EEA3 Precision: 1us (-25) Root distance: 15.312ms (max: 5s) Offset: -1.621ms Delay: 236us Jitter: 0 Packet count: 1 Frequency: -15.309ppm