配置NTP服务

#服务端

yum install -y ntp
vi /etc/ntp.conf
logfile /var/log/ntp.log
#添加以下2行，防止出现客户端no server suitable
server 127.127.1.0 
fudge 127.127.1.0 stratum 10
systemctl restart ntpd
systemctl enable ntpd
ntpq -p
ntpdc -c sysinfo

参考资料

http://www.thegeekstuff.com/2014/06/linux-ntp-server-client/

http://www.linuxidc.com/Linux/2014-01/95258.htm

http://xiahongyuan.blog.51cto.com/906214/939815

http://blog.sina.com.cn/s/blog_539438c70101j3z7.html

http://blog.csdn.net/love_life2011/article/details/8067652