[student@localhost Desktop]$ timedatectl
Local time: Sat 2017-06-03 21:58:12 CST
Universal time: Sat 2017-06-03 13:58:12 UTC
Timezone: Asia/Shanghai (CST, +0800)
NTP enabled: yes
NTP synchronized: no
RTC in local TZ: no
DST active: n/a
[student@localhost Desktop]$
对时间设定需要root
远程到server0
[root@server0 ~]# timedatectl list-timezones 查看支持的时区
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
[root@server0 ~]# timedatectl set-timezone "America/New_York"
[root@server0 ~]# timedatectl
Local time: Sat 2017-06-03 10:09:02 EDT
Universal time: Sat 2017-06-03 14:09:02 UTC
RTC time: Sat 2017-06-03 22:09:02
Timezone: America/New_York (EDT, -0400)
NTP enabled: yes
NTP synchronized: no
RTC in local TZ: no
DST active: yes
Last DST change: DST began at
Sun 2017-03-12 01:59:59 EST
Sun 2017-03-12 03:00:00 EDT
Next DST change: DST ends (the clock jumps one hour backwards) at
Sun 2017-11-05 01:59:59 EDT
Sun 2017-11-05 01:00:00 EST
[root@server0 ~]#
[root@server0 ~]# timedatectl set-time 22:25:00 设置 时间
[root@server0 ~]# timedatectl set-ntp true
[root@server0 ~]# timedatectl
Local time: Sat 2017-06-03 22:27:06 EDT
Universal time: Sun 2017-06-04 02:27:06 UTC
RTC time: Sun 2017-06-04 02:27:07
Timezone: America/New_York (EDT, -0400)
NTP enabled: yes
NTP synchronized: no
RTC in local TZ: no
DST active: yes
Last DST change: DST began at
Sun 2017-03-12 01:59:59 EST
Sun 2017-03-12 03:00:00 EDT
Next DST change: DST ends (the clock jumps one hour backwards) at
Sun 2017-11-05 01:59:59 EDT
Sun 2017-11-05 01:00:00 EST
[root@server0 ~]# vim /etc/chrony.conf
写入
server content.example.com iburst 目的是 让系统知道从哪里同步NTP时间
[root@server0 ~]# systemctl enable chronyd
[root@server0 ~]# systemctl restart chronyd
[root@server0 ~]#
大约需要五分钟才可以同步
检验：
[root@server0 ~]# timedatectl 命令1
Local time: Sat 2017-06-03 10:22:59 EDT
Universal time: Sat 2017-06-03 14:22:59 UTC
RTC time: Sat 2017-06-03 14:22:59
Timezone: America/New_York (EDT, -0400)
NTP enabled: yes 看这里
NTP synchronized: yes 看这里
RTC in local TZ: no
DST active: yes
Last DST change: DST began at
Sun 2017-03-12 01:59:59 EST
Sun 2017-03-12 03:00:00 EDT
Next DST change: DST ends (the clock jumps one hour backwards) at
Sun 2017-11-05 01:59:59 EDT
Sun 2017-11-05 01:00:00 EST
[root@server0 ~]# chronyc sources -v 命令2
210 Number of sources = 1
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| / xxxx = adjusted offset,
|| Log2(Polling interval) -. | yyyy = measured offset,
|| \ | zzzz = estimated error.
|| | |
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* cla***oom.example.com 8 6 37 28 +230ns[ +164us] +/- 1082us
[root@server0 ~]# chro
chronyc chronyd chroot
[root@server0 ~]# chronyc 命令3
chrony version 1.29.1
Copyright (C) 1997-2003, 2007, 2009-2013 Richard P. Curnow and others
chrony comes with ABSOLUTELY NO WARRANTY. This is free software, and
you are welcome to redistribute it under certain conditions. See the
GNU General Public License version 2 for details.
chronyc> waitsync 命令4
try: 1, refid: 172.25.254.254, correction: 0.000006130, skew: 1.482
chronyc>