chrony 是ntp在替代品，使用上比ntp更简单

install chrony

yum install chrony
# rpm -ql chrony
/etc/chrony.conf
/usr/bin/chronyc
/usr/sbin/chronyd

chrony server config

# vi /etc/chrony.conf
server cn.pool.ntp.org iburst
server tw.pool.ntp.org iburst
allow 192.168.43.0/24
local stratum 10

# restart service
systemctl restart chronyd

chrony client config

#vi /etc/chrony.conf
server 192.168.43.101 iburst

# restart service
systemctl restart chronyd

chrony check

chronyc sources
chronyc sourcestats

manual sync time

ntpdate -s 192.168.43.101

5分钟入门chrony

原文：https://www.cnblogs.com/cheyunhua/p/13700304.html