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　　server pool.ntp.org  # 首先定义服务器
 
　　restrict default nomodify notrap noquery  
 
　　restrict 192.168.0.0 mask 255.255.255.0 notrust nomodify notrap #从192.168.0.1-192.168.0.254的服务器都可以使用我们的NTP服务器来同步时间。  
 
　　# 注释掉以下一行  
 
　　#restrict default ignore 

　　#chkconfig ntpd on  
　　#/etc/init.d/ntpd start  
　　#/etc/init.d/ntpd stop  
　　#/etc/init.d/ntpd restart 

0 3 * * * /usr/sbin/ntpdate 192.168.0.179 

************************************************

时间服务器的IP为:192.168.10.1

1). # rpm -ivh ntp-4.1.2-4.EL3.1.i386.rpm

2). # vi /etc/ntp.conf

注释一行

restrict default ignore

加入一行

restrict 192.168.10.0 mask 255.255.255.0 notrust nomodify notrap

3). # vi /etc/ntp/step-tickers

加入一行

pool.ntp.org

这样每次ntpd启动时，会自动连接该国际标准时间服务器;

4). # service ntpd start

5). # netstat -an |grep 123

确保该端口以udp方式开放

时间客户端配置(192.168.10.2)

a. # ntpdate 192.168.10.2

应该显示同步成功

b. # crond -e

加入

0-59/10 * * * * /usr/sbin/ntpdate 192.168.10.1

表示每隔10分钟同步一次时间。

Related Links

Build and Install


• Building and Installing the Distribution
  
• Quick Start
  
• Release Notes
  
• Build Options
  
• NTP Debugging Techniques
  
• Debugging Reference Clock Drivers
  
• ntpd Event Messages and Status Words
  
• ntpd System Log Messages
  
• NTP Bug Reporting Procedures
  
• Site Map

Program Manual Pages


• ntpd - Network Time Protocol (NTP) daemon
  
• ntpq - standard NTP query program
  
• ntpdc - special NTP query program
  
• ntpdate - set the date and time via NTP
  
• sntp - Simple Network Time Protocol (SNTP) client
  
• ntptrace - trace a chain of NTP servers back to the primary source
  
• tickadj - set time-related kernel variables
  
• ntptime - read and set kernel time variables
  
• ntp-keygen - generate public and private keys
  
• ntpdsim - Network Time Protocol (NTP) simulator
  
• Site Map

Configuration Commands and Options


• Command Index
  
• Server Options
  
• Access Control Options
  
• Authentication Options
  
• Monitoring Options
  
• Reference Clock Options
  
• Miscellaneous Options
  
• Configuration File Definition (Advanced)
  
• Site Map

Client and Server Configuration


• Association Management
  
• Rate Management and the Kiss-o'-Death Packet
  
• Automatic Server Discovery
  
• Site Map

Reference Clock Support


• Reference Clock Drivers
  
• External Clock Discipline and the Local Clock Driver
  
• How to Write a Reference Clock Driver
  
• How to build new PARSE clocks
  
• Site Map

Reference Clock Audio Drivers


• Reference Clock Audio Drivers
  
• Radio CHU Audio Demodulator/Decoder
  
• Radio WWV/H Audio Demodulator/Decoder
  
• IRIG Audio Decoder
• Site Map

Miscellaneous


• Copyright Notice
  
• Mitigation Rules and the prefer Keyword
  
• Kernel Model for Precision Timekeeping
  
• PPSAPI Interface for Precision Time Signals
  
• Pulse-per-second (PPS) Signal Interfacing
  
• Gadget Box PPS Level Converter and CHU Modem
  
• Site Map

External Links


• Computer Network Time Synchronization - The Network Time Protocol (book)
  
• NTP Public Services Project (home page)
  
• NTP Research Project (home page)
  
• Executive Summary: Computer Network Time Synchronization
  
• The NTP Timescale and Leap Seconds
  
• NTP Timestamp Calculations
  
• The NTP Era and Era Numbering
  
• Timestamp Capture Principles
  
• Autonomous Configuration
  
• Autonomous Authentication
  
• Autokey Protocol
  
• Autokey Identity Schemes
  
• Site Map