新装的ntp服务器无法更新，google一下
http://www.planetcobalt.net/sdb/ntp_leap.shtml
使用如下方法好用了？
As it turned out I had to force the initial synchronization by running ntpdate with its "shut up and set the f***ing time" parameter (-b) to make things work:
root@argon:~ # ntpdate -b 192.168.42.23
原文：http://my.oschina.net/u/1177171/blog/514055