ntp服务器

iorifreedom

一段时间没有上来了，因为曾经的一个项目正在结项，有些问题需要解决。今天简单写写和ntp协议配置相关的文件及方法。
1、相关文件和目录
　/etc/ntp.conf  ／＊主配置文件，服务器和客户端都可用＊／
  /etc/ntp/step-tickers /*上层ntp服务器ip/domain*/
  /etc/ntp/...
2、查看安装
　rpm -q ntp
3、文档说明
「1」/etc/ntp.conf
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap noquery
#设置其他pc对本机NTP服务访问权限 ignore/nomodify/notrust/noquery
# Permit all access over the loopback interface.  This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
#peer  192.168.0.100  可用作对等的ntp服务器
# -- CLIENT NETWORK -------
# Permit systems on this network to synchronize with this
# time service.  Do not permit those systems to modify the
# configuration of this service.  Also, do not use those
# systems as peers for synchronization.
# restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# --- OUR TIMESERVERS 校对用到的上层ntp服务器列表-----
server 137.189.8.137 prefer  
#有prefer表示优先级别更高
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
#n.pool.ntp.org是ntp服务池中的服务器
# --- NTP MULTICASTCLIENT ---
#multicastclient                       
# listen on default 224.0.1.1
# restrict 224.0.1.1 mask 255.255.255.255 nomodify notrap
# restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
#可对某些子网方式控制
# --- GENERAL CONFIGURATION ---
#
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available. The
# default stratum is usually 3, but in this case we elect to use stratum
# 0. Since the server line does not have the prefer keyword, this driver
# is never used for synchronization, unless no other other
# synchronization source is available. In case the local host is
# controlled by some external source, such as an external oscillator or
# another protocol, the prefer keyword would cause the local host to
# disregard all other synchronization sources, unless the kernel
# modifications are in use and declare an unsynchronized condition.
#使用本地时钟
server  127.127.1.0     # local clock
fudge   127.127.1.0 stratum 10
#
# Drift file.  Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
#记录与上层服务器联系所花时间的文件
driftfile /var/lib/ntp/drift　　　
broadcastdelay  0.008
#
# Keys file.  If you want to diddle your server at run time, make a
# keys file (mode 600 for sure) and define the key number to be
# used for making requests.
#
# PLEASE DO NOT USE THE DEFAULT VALUES HERE. Pick your own, or remote
# systems might be able to reset your clock at will. Note also that
# ntpd is started with a -A flag, disabling authentication, that
# will have to be removed as well.
#
keys            /etc/ntp/keys
4、启动与停止
/etc/init.d/ntpd start
/etc/init.d/netd restart
/etc/init.d/netd stop
或ntsysv自启动ntpd服务
5、测试网络时间服务
ntpq -p   监查同步状态
ntptrace XX.XX.XX.XX 校对时间
ntpdate XX.XX.XX.XX  客户端校对，在15小时差异之内，否则需要手动调
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/21862/showart_150871.html