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What happens when NTP is out of sync?
How do I resolve the error “Server’s time may be out of sync”? Time discrepancy issues that result in the “Server’s time may be out of sync” error message are most commonly resolved by SSHing into the server hosting your Duo-protected application or service and using Network Time Protocol (NTP) to set the correct time.
How accurate is NTP time?
NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions. Asymmetric routes and network congestion can cause errors of 100 ms or more.
When does NTP sync with the system clock?
Feb 20 15:57:11 server2 systemd: Started Set time via NTP. IMPORTANT NOTE: With Red Hat Enterprise 7 when the system clock is synchronized by the Network Time Protocol (NTP) or Precision Time Protocol (PTP), the kernel automatically synchronizes the hardware clock to the system clock every 11 minutes.
How to check if NTP is working on Linux?
The above is easy way to verify NTP is working on Linux. You learned how to verify that your NTP configuration is working properly. Now you know how to check the status of your date and time, synchronized with upstream time servers. For more info see ntpd docs here.
Can you run ntpdate while ntpd is running?
However you cannot run ntpdate while ntpd is running, so you must stop it first. Given you are only booting the pi for a few hours the clock drift is negligible during this time (almost immeasurable) you do not need to run ntpd at all.
How to check the status of the NTP daemon?
ntpstat command. The ntpstat command will report the synchronisation state of the NTP daemon running on the local machine. If the local system is found to be synchronised to a reference time source, ntpstat will report the approximate time accuracy.