1安裝工具
[root@kiccleaf home]# yum install -y chrony
Installed:
chrony-3.5-1.el8.x86_64 timedatex-0.5-3.el8.x86_64
Complete!
安裝好工具，先啟動
[root@kiccleaf home]# systemctl start chronyd
設為系統自動啟動
[root@kiccleaf home]# systemctl enable chronyd
編輯一下配置文件
[root@kiccleaf home]# vim /etc/chrony.conf
2/etc/chrony.conf配置文件內容：
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#pool 2.centos.pool.ntp.org iburst （這一行注釋掉，增加以下兩行）
server ntp.aliyun.com iburst
server cn.ntp.org.cn iburst
3重新加載配置並測試：
重新加載配置
[root@kiccleaf home]# systemctl restart chronyd.service
[root@kiccleaf home]# chronyc sources -v
210 Number of sources = 2
.-- 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
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 203.107.6.88 2 6 7 2 -188us[+6871us] +/- 24ms
^- 61.177.189.190 3 6 17 19 +663us[ +663us] +/- 97ms
[root@kiccleaf home]# date
Sat Aug 29 16:26:08 CST 2020