结果一看，NTP时间没同步，时间都飘到3天后了。我寻思我装完系统都是顺便开NTP的，结果一看日志NTP同步都是timeout。于是开了ticket，结果他回复：
Since DMIT has blocked most of the NTP Server for security reason, we need to choose appropriate NTP Server.
At present, the useable NTP Server is only provided by Google, which address is time1-4.google.com
也就是只能用 Google 的NTP，其他的不给用
