OracleLinux NTP时间服务器配置同步方案

OracleLinux NTP时间服务器配置同步方案目标环境，Oracle linux6，作为内网的NTP时间服务器，局域网内的其他机器与这台服务做时间同步。

2、安装配置

Oracle linux6系统已经自带了NTPD服务，一般默认是安装了的，如果没有安装，先检查下，然后配置好yum仓库，yum方式安装下就OK，具体如下：

# rpm -q ntp

ntp-4.2.4p8-2.el6.x86_64 // 这表示已安装了，如果没有安装，这是空白。

如果没有安装，我们按照下

# yum install ntp

......

按上面的安装方式在内网每台服务器上都安装好NTP软件包。

完成后，都需要配置NTP服务为自启动

# chkconfig ntpd on

# chkconfig --list ntpd

ntpd 0:关闭1:关闭2:启用3:启用4:启用5:启用6:关闭

在配置前，先使用ntpdate手动同步下时间，免得本机与外部时间服务器时间差距太大，让ntpd不能正常同步。

# ntpdate -u 202.112.10.36

22 Dec 16:52:38 ntpdate[6400]: adjust time server 202.112.10.36 offset 0.012135 sec

配置内网NTP-Server

下面主要是配置内网的NPTD服务器, NTPD服务配置核心就在/etc/ntp.conf文件，配置好了就OK。先上配置文件再说，红色部分是修改部分，注意红色修改部分。

# For more information about this file, see the man pages

# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).

driftfile /var/lib/ntp/drift

# Permit time synchronization with our time source, but do not

# permit the source to query or modify the service on this system.

restrict default kod nomodify notrap nopeer noquery

restrict -6 default kod nomodify notrap nopeer 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

restrict -6 ::1

# Hosts on local network are less restricted.

# 允许内网其他机器同步时间

restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

# Use public servers from the project.

# Please consider joining the pool (/join.html). # 中国这边最活跃的时间服务器: /zone/cn server 210.72.145.44 perfer # 中国国家受时中心

server 202.112.10.36 #

server 59.124.196.83 #

#broadcast 192.168.1.255 autokey # broadcast server

#broadcastclient # broadcast client

#broadcast 224.0.1.1 autokey # multicast server

#multicastclient 224.0.1.1 # multicast client

#manycastserver 239.255.254.254 # manycast server

#manycastclient 239.255.254.254 autokey # manycast client

# allow update time by the upper server

# 允许上层时间服务器主动修改本机时间

restrict 210.72.145.44 nomodify notrap noquery

restrict 202.112.10.36 nomodify notrap noquery

restrict 59.124.196.83 nomodify notrap noquery

# Undisciplined Local Clock. This is a fake driver intended for backup # and when no outside source of synchronized time is available.

# 外部时间服务器不可用时，以本地时间作为时间服务

server 127.127.1.0 # local clock

fudge 127.127.1.0 stratum 10

# Enable public key cryptography.

#crypto

includefile /etc/ntp/crypto/pw

# Key file containing the keys and key identifiers used when operating # with symmetric key cryptography.

keys /etc/ntp/keys