记录一下

/usr/sbin/ntpdate -d time.windows.com

29 Dec 22:15:42 ntpdate[3744]: ntpdate 4.2.6p5@1.2349-o Tue May 31 10:09:22 UTC 2016 (1)

Looking for host time.windows.com and service ntp

host found : 52.169.179.91

transmit(52.169.179.91)

transmit(52.169.179.91)

transmit(52.169.179.91)

transmit(52.169.179.91)

transmit(52.169.179.91)

52.169.179.91: Server dropped: no data

server 52.169.179.91, port 123

stratum 0, precision 0, leap 00, trust 000

refid [52.169.179.91], delay 0.00000, dispersion 64.00000

transmitted 4, in filter 4

reference time:    00000000.00000000  Mon, Jan  1 1900  8:05:43.000

originate timestamp: 00000000.00000000  Mon, Jan  1 1900  8:05:43.000

transmit timestamp:  dc0f9911.af8c98c3  Thu, Dec 29 2016 22:15:45.685

filter delay:  0.00000  0.00000  0.00000  0.00000 

         0.00000  0.00000  0.00000  0.00000 

filter offset: 0.000000 0.000000 0.000000 0.000000

         0.000000 0.000000 0.000000 0.000000

delay 0.00000, dispersion 64.00000

offset 0.000000

29 Dec 22:15:46 ntpdate[3744]: no server suitable for synchronization found

解决方法：

    yum install ntp

    /etc/init.d/ntpd start

     # /usr/sbin/ntpdate time.windows.com

     29 Dec 22:24:39 ntpdate[3805]: the NTP socket is in use, exiting

    /etc/init.d/ntpd stop

    /usr/sbin/ntpdate cn.pool.ntp.org

    29 Dec 14:26:50 ntpdate[3820]: step time server 42.96.167.209 offset -28703.604438 sec

成功解决，具体原因还有待查。

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Server dropped: no data (ntpdate 同步时间服务器)