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Does chrony use NTP?
chrony is a versatile implementation of the Network Time Protocol (NTP). It can synchronise the system clock with NTP servers, reference clocks (e.g. GPS receiver), and manual input using wristwatch and keyboard.
Can chrony and NTP run at the same time?
daily to keep the hardware clock synced with the system time. Chrony and NTP (the service) both use the same configuration, and the files’ contents are interchangeable. The man pages for chronyd, chronyc, and chrony.
How does Systemd Timesyncd work?
The systemd-timesyncd tool provides a decent NTP client that can keep time on a local host synchronized with an NTP server. However, systemd-timesyncd does not provide a server service, so if you need an NTP server on your network, you must use something else, such as Chrony, to act as a server.
What’s the difference between Chrony and systemd timesyncd?
I know that systemd-timesyncd is a more or less minimal ntp client implementation whereas chrony is a full fledged NTP daemon solution that happens to include an NTP client. For simple time sync needs the base system already comes with systemd-timesyncd.
What’s the difference between NTP and systemd timesyncd?
(Note that I have a different system (in a different network) for which both methods indicate success and yield the correct time.) systemd-timesyncd is basically a small client-only NTP implementation more or less bundled with newer systemd releases.
How does Chrony synchronize with NTP time server?
All three synchronize the local host time with the NTP time server. The systemd-timesyncd service is not as reliable as chronyd, but this is sufficient for most purposes. If RTC is not synchronized, it can gradually adjust the system time to synchronize with the NTP server when the local system time is slightly shifted.
Why do we need time synchronization in Linux?
Tracking e-mail through a series of servers or determining the exact sequence of events using log files on geographically dispersed hosts can be much easier if the computers are synchronized in time. Linux hosts must be aware that there is a system time and RTC time.