Ntp服务开启.doc

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一、 服务器端
1、 安装ntp包
2、 配置ntp服务
修改ntp.conf文件，具体见附录
3、 启动服务
/etc/init.d/ntpd start
4、自动启动
chkconfig ntpd on
5、 测试命令
ntptrace
ntpq -p

二、 客户端
1、 安装ntp包
2、 配置ntp服务
修改ntp.conf文件，具体见附录

3、 查询时间
不用启动ntpd服务，否则会出错
执行命令：
ntpdate 192.168.112.201 即可同步
4、FAQ
如果执行命令出现一下错误
1提示：7 Dec 19:24:55 ntpdate[2120]: the NTP socket is in use, exiting
这个是你linux机器上已经存在这个进程，输入：ps -ef | grep ntpd
Kill掉ntp的进程
2.提示：No Server suitable for synchronization found
这个是最容易出现的问题，比较常见的是配置好服务器并启动服务器进程后，马上
启动客户进程，那么客户进程就会报错。解决方法是，在大约3-5分钟以后启动进程就行
我想每10分钟就和Windows服务同步时间
1.创建自己的一个crontab文件，随便建立一个文件date.cron，首先可以使用任何文本
编辑器建立一个新文件，然后向其中写入需要运行的命令和要定期执行的时间。
vi date.cron加入下面要运行的命令和要定期执行的时间
*/10 * * * * /usr/sbin/ntpdate 192.168.1.32
然后存盘退出
2.使用crontab命令来安装这个文件，使之成为该用户的crontab文件。键入：
crontab date.cron
这个文件已经建立好了
3.使用命令：
crontab -l  (查看安排的作业序列）可以看到刚才的作业
如：
[root@NXD-TEST root]# crontab -l
# DO NOT EDIT THIS FILE - edit the master and reinstall.
# (date.cron installed on Tue Dec  7 18:22:42 2004)
# (Cron version -- $Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $)
*/10 * * * * /usr/sbin/ntpdate 192.168.1.32
现在就OK了，每10分钟Linux就和服务端同步一次。

附录：
服务器端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

# 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

# -- 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 192.168.112.0 mask 255.255.255.0 nomodify #112网段的客户端都可以访问

# --- OUR TIMESERVERS -----
#server 0.pool.ntp.org ＃不配置Internet网络时间服务器
#server 1.pool.ntp.org
#server 2.pool.ntp.org

# --- 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

# --- 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.
#
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.
#
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

客户端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

# 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

# -- 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 -----
server 192.168.112.201 ＃设置局域网时间服务器地址
#server 0.pool.ntp.org
#server 1.pool.ntp.org
#server 2.pool.ntp.org

# --- 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

restrict 192.168.112.201 mask 255.255.255.0 nomodifY

# --- 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.
#
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.
#
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

2006-08-09
华为三康机密，未经许可不得扩散
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