NTP

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Network Time Protocol

Software

ntpd

ntpq

Understanding ntpq output

Query status:

ntpq -p
     

Jitter: variance in latency on the network Offset: time difference between the peers or between the server and client


Which one on which OS

Centos 8

chronyd

Ubuntu 20

timedated and friends: https://ubuntu.com/server/docs/network-ntp

FAQ

systemd ntp equivalent

systemctl status systemd-timesyncd.service