# timedatectl输出
Local time: Tue 2020-10-06 13:35:31 PDT
Universal time: Tue 2020-10-06 20:35:31 UTC
RTC time: Tue 2020-10-06 20:35:30
Time zone: America/Los_Angeles (PDT, -0700)
System clock synchronized: no
NTP service: active
RTC in local TZ: no
/etc/chrony.conf是 RHEL 8 中的默认设置（带有预配置的池）。
# chronyc sources输出
210 Number of sources = 8
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? excalibur.prolixium.com 0 9 0 - +0ns[ +0ns] +/- 0ns
^? paladin.latt.net 0 9 0 - +0ns[ +0ns] …