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What is NTPQ command?
Description. The ntpq command queries the NTP servers running on the hosts specified which implement the recommended NTP mode 6 control message format about current state and can request changes in that state. It runs either in interactive mode or by using command-line arguments.
Does NTP sync Hwclock?
The ntp daemon xntpd is one thing that turns it on. You can turn it off by running anything, including hwclock –hctosys, that sets the System Time the old fashioned way.
Why does NTP take a long time to sync?
Why it is happens? The rpi does not have an RTC, and so it boots always in 1 Jan 1970 – the time to put the server and NTP synchronised slowly and incrementally is bigger; so by default NTP does not start operating normally until the difference between NTP and the system is corrected.
Why does NTP use more than one server?
Use the default settings for your specific Linux distribution. With more than one server entry, your NTP server queries all servers and select a time on which most of the polled servers agree. Because NTP uses three or more servers, your clock is more accurate than if it uses only one.
How does ntpd work in one time mode?
ntpd normally operates continuously while monitoring for small changes in frequency and trimming the clock for the ultimate precision. However, it can operate in a one-time mode where the time is set from an external server and frequency is set from a previously recorded frequency file.
What is the theoretical precision of ntpd synchronization?
The ntpd utility can synchronize time to a theoretical precision of about 232 picoseconds. In practice, this limit is unattainable due to quantum limits on the clock speed of ballistic-electron logic. Ordinarily, ntpd reads the ntp.conf (5) configuration file at startup time in order to determine the synchronization sources and operating modes.