自定 systemd-timesyncd.service NTP server

1.編輯 /etc/systemd/timesyncd.conf
[Time]
NTP=a.b.c.d

2.重啟服務
systemctl restart systemd-timesyncd.service

3.相關指令
systemctl status systemd-timesyncd.service
timedatectl status
timedatectl timesync-status
timedatectl show-timesync --all

journalctl -u systemd-timesyncd --no-hostname --since "1 day ago"