CentOS: NTP服务器的搭建

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参考:https://blog.csdn.net/mmz_xiaokong/article/details/8700979

https://blog.csdn.net/u013444177/article/details/44530737/

https://www.cnblogs.com/vincenshen/p/6284933.html

1.测试环境: 192.168.103.40

cat /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m

2.安装:

yum install ntp

3.修改配置:vi /etc/ntp.conf

#(阿里云NTP Server)
server 120.24.166.46
server 127.127.1.0 fudge
127.127.1.0 stratum 8

重启ntpserver: /etc/init.d/ntpd restart

4.测试:

ntpdate -d 192.168.103.40

5.问题:

1. Server dropped: no data

no server suitable for synchronization found

错误原因: ntpserver端口123未开.

解决办法:修改防火墙配置,开放端口. centos是修改iptables.

vi /etc/sysconfig/iptables

增加:

#ntp server 123 UDP
-A INPUT -p udp --dport 123 -j ACCEPT

重启ntpserver服务:

/etc/init.d/iptables restart

2.客户端使用crontab 同步时间不生效问题:

#成功.要这么写,有完整路径

0 * * * *  /usr/sbin/ntpdate 192.168.103.40

#失败.

0 * * * *  ntpdate 192.168.103.40