centos time synchronization issues

linux time in 24-hour format approach (CentOS)

1, into a 24-hour method

. 1  # the tzselect
 2  
. 3 prompted to select: . 5 -> . 9 -> . 1 -> . 1 -> OK
 . 4  
. 5  RM / etc / localtime
 . 6  
. 7  LN -SF5 / usr / Share / zoneinfo / Asia / of Shanghai / etc / localtime

 

2, time synchronization troubleshooting methods 

The machine above a centos minimize installation, yum -y install ntpdate ntpdate installation time synchronization.

However, when the execution ntpdate -u ntp.sjtu.edu.cn of life and death can not adjust the time. And report the following error

1 30 Oct 23:30:56 ntpdate[8200]: no server suitable for synchronization found

Execution: ntpdate -d ntp.sjtu.edu.cn when debugging command, it appears information:

 1 30 Oct 23:26:54 ntpdate[8183]: ntpdate 4.2.6p5@1.2349-o Sat Nov 23 18:21:48 UTC 2013 (1)
 2 Looking for host ntp.sjtu.edu.cn and service ntp
 3 host found : 202.120.2.100
 4 transmit(202.120.2.100)
 5 transmit(202.120.2.100)
 6 transmit(202.120.2.100)
 7 transmit(202.120.2.100)
 8 transmit(202.120.2.100)
 9 202.120.2.100: Server dropped: no data
10 “......以下信息略”
11  
12 30 Oct 23:27:33 ntpdate[8183]: no server suitable for synchronization found