yum install ntp ntpdate
vi /etc/ntp.conf

允许查询的客户端网端

restrict 172.16.0.0 mask 255.255.0.0 nomodify notrap
chkconfig ntpd on
chkconfig ntpdate on
service ntpd start
service ntpdate start
iptables -I INPUT 行号 -m state --state NEW -m udp -p udp --dport 123 -j ACCEPT
service iptables save

在客户端测试

ntpq -p
ntpdate ntp.xxxx.com

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