• gzip -d ntp-4.1.72.tar.gz
• tar -xvf ntp-4.1.72.tar
• cd ntp-4.1.72
• ./configure
• make
• make check
• make install

Guide to configure NTP for Unix/Linux

• Creat an empty file: /etc/ntp.drift
• Creat /etc/ntp.conf as below:
  server server1 #get time from upper level server
  server server2 #at least 3 servers are needed
  #more NTP servers
  fudge 127.127.1.1 stratum 10 refid LCL
  peer server3 key keyid #between the same level servers
  peer server4 key keyid #a key needed between 2 servers
  #more NTP servers
  #some statistics info below
  statistics cryptostats loopstats peerstats
  driftfile /etc/ntp.drift # path for drift file
  statsdir /var/log/ntp/ # path for statistics files
  logfile /var/log/ntp/ntp.log # path for log file
  keys /etc/ntp.keys #path for key file
• Creat /etc/ntp.keys as below:
  keyid  M xxxxxxxx #M means MD5
• Run "ntpd", then "ntpq" after minutes,
  and try "as" and "pe" to check the status
  ntpd runs ok if as below:
  ntpq> as
  ind assID status conf reach auth condition last_event cnt
  ==================================
  1    24045 9614  yes   yes   none sys.peer  reachable  1
  2    24046 9414  yes   yes   none candidat  reachable  1
  3    24047 9414  yes   yes   none candidat  reachable  1
  ntpq> pe
  remote    refid   st t when poll reach delay offset     jitter
  ===================================
  *server1 .GPS. 1  u 100   128 377   1.078 -26.702 12.893
  +server2 ...     2  u 103   128 377   0.844 -11.303   9.262
  +server3 ...     2  u   32   128 377   4.748  -9.788   12.984
  
• Better synchronize the local time by:
  "ntpd -q" or "ntpdate some.ntp.server"

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• 安装程序
• 选择单服务器模式
• 参考NTP服务列表，设置服务器地址
• ntpd的控制在：
  控制面板->管理工具->组件服务-NetworkTimeProtocol
• 可以启动ntpd守护进程保持时间同步
• 或者停止ntpd，执行命令行"ntpdate -b some.ntp.server"

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