NTP --- Introductions time synchronization server

2010-07-15  来源:本站原创  分类:Development  人气:177 

NTP (Network Time Protocol) is a University of Delaware, United States (University of Delaware) of David L. Mills made professor in 1985, is used to synchronize the computer time to a communication protocol that allows computers to their servers or clock source (quartz clock, GPS, etc.) to do synchronization, it can provide high-precision time correction (LAN with standard deviation less than 1 ms between, WAN, on dozens of milliseconds), and can be encrypted to prevent the agreement attack.

NTP time server (time server) is to use an NTP server, through which the machine can maintain the network time synchronization. NTP version 1 appeared in June 1988, described in RFC-1059 the first complete NTP norms and related algorithms. This version has been adopted client / server model and the symmetry operation, but it does not support the mandate to identify and NTP control message. Launched in September 1989 to replace RFC-958 and RFC-1059 for NTP v2 version of the RFC-1119.
Almost the same time, the U.S. Digital Equipment Corporation DEC (Digital Equipment Corporation) has launched a time synchronization protocol, the digital time synchronization service DTSS (Digital Time Synchronization Service).

Below to 210.72.145.44 (CAS Time Service Center (Xi'an)) NTP client Example Shao Kai set under way:
A, Linux
Ntpdate command can be synchronized with the time server (if not installed ntp software, CentOS can "yum install-y ntpdate" command to install):

/ Usr / sbin / ntpdate 210.72.145.44 (Chinese Academy of Sciences Time Service Center (Xi'an))

If you want to conduct regular implementation of the ntpdate time synchronization can be carried out by crontab:
crontab-e

Enter the following, the first 15 minutes to an hour to do a time synchronization:
15 * * * * / usr / sbin / ntpdate 210.72.145.44

In addition, there are good and stable server:
(United States)
time.nist.gov
(Fudan) (internal users recommended)
ntp.fudan.edu.cn
Microsoft's timing master (U.S.)
time.windows.com
Big Time Service Center, the police station (Taiwan)
asia.pool.ntp.org
Netcom Time Service Center (Beijing)
219.158.14.130
time.twc.weather.com
swisstime.ethz.ch
ntp0.fau.de
ntp3.fau.de
time-a.nist.gov
time-b.nist.gov
time-nw.nist.gov
nist1-sj.glassey.com
NTP server (Shanghai)
ntp.api.bz

B, Windows
Please Double click the bottom right corner of the time, according to the following chart settings:
NTP --- Introductions time synchronization server

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