Debian 11 Bullseye
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NTP : Configure NTP Client
2021/08/17
 
Configure NTP Client.
 
An NTP Client [systemd-timesyncd.service] is running by default on Debian, so it's easy to set NTP Client.
By the way, it's also possible to use NTPd or Chrony as an 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; ve>
     Active: active (running) since Mon 2021-08-16 19:23:47 PDT; 32s ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 320 (systemd-timesyn)
     Status: "Initial synchronization to time server 129.250.35.251:123 (2.debi>
      Tasks: 2 (limit: 4675)
     Memory: 1.1M
        CPU: 47ms
     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 (-25)
Root distance: 13.045ms (max: 5s)
       Offset: -43us
        Delay: 536us
       Jitter: 0
 Packet count: 1
    Frequency: +1.753ppm
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