- In RHEL8/9,
timedatectlcan not be used to check 11 minutes mode is on and working or not.
timedatectlreports "System clock synchronized: yes" even if "rtcsync" is commented in /etc/chrony.conf.
[root@vm80 etc]# grep rtc /etc/chrony.conf #rtcsync [root@vm80 etc]# timedatectl Local time: Tue 2020-01-21 15:45:55 JST Universal time: Tue 2020-01-21 06:45:55 UTC RTC time: Tue 2020-01-21 06:45:54 Time zone: Asia/Tokyo (JST, +0900) System clock synchronized: yes <=== NTP service: active RTC in local TZ: no
- Unreliable RTC synchronization (11-minute mode) in RHEL 8 (prior to kernel-4.18.0-348.el8), it may take a very long time to actually set the RTC. RHEL 9 doesn't have this issue.
- RTC synchronization (11-minute mode) doesn't work on KVM
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
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