1、安装NTP软件包
yum install ntp
2、在ntp.conf
中配置Restrict values
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
3、只允许指定客户端
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
4、添加本地时钟
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
5、修改NTP日志参数
driftfile /var/lib/ntp/ntp.drift
logfile /var/log/ntp.log
6、启动NTP服务(作为Server)
service ntpd start