安装ntpd yum install ntpdate
timedatectl查看时间各种状态：
[root@localhost network-scripts]# timedatectl Local time: Sun 2019-12-29 23:45:49 EST Universal time: Mon 2019-12-30 04:45:49 UTC RTC time: Mon 2019-12-30 13:49:38 Time zone: America/New_York (EST, -0500) NTP enabled: no NTP synchronized: no RTC in local TZ: no DST active: no Last DST change: DST ended at Sun 2019-11-03 01:59:59 EDT Sun 2019-11-03 01:00:00 EST Next DST change: DST begins (the clock jumps one hour forward) at Sun 2020-03-08 01:59:59 EST Sun 2020-03-08 03:00:00 EDT [root@localhost network-scripts]#
开启时钟同步后的状态如下：
[root@localhost ~]# timedatectl Local time: һ 2019-12-30 13:39:32 CST Universal time: һ 2019-12-30 05:39:32 UTC RTC time: һ 2019-12-30 05:39:33 Time zone: Asia/Shanghai (CST, +0800) NTP enabled: yes NTP synchronized: yes RTC in local TZ: no DST active: n/a [root@localhost ~]#
timedatectl list-timezones: 列出所有时区
timedatectl set-local-rtc 1 将硬件时钟调整为与本地时钟一致, 0 为设置为 UTC 时间
timedatectl set-timezone Asia/Shanghai 设置系统时区为上海
校准时间
yum -y install ntp #通过阿里云时间服务器校准时间
修改 注释原来的服务器：
添加如下两行：
server 192.168.32.221
restrict 192.168.32.221 nomodify notrap noquery
查看同步状态： [root@localhost ~]# ntpq -p remote refid st t when poll reach delay offset jitter ——————————————————————————————
*192.168.32.221 120.25.115.20 3 u 83 128 377 0.109 26.318 28.265 [root@localhost ~]# [root@localhost ~]#
