$ timedatectl

Local time: Sat 2019-08-17 17:55:41 CST

Universal time: Sat 2019-08-17 09:55:41 UTC

RTC time: Sat 2019-08-17 09:55:41

Time zone: Asia/Shanghai (CST, +0800)

NTP enabled: yes

NTP synchronized: yes

RTC in local TZ: no

DST active: n/a

要看到两个yes才行。NTP enabled:yes表示 timedatectl set-ntp true，NTP synchronized:yes表示ntpd进程正在正常运行。