1、配置内网NTP-Server(192.168.1.135)

# yum install ntp

# chkconfig ntpd on

# chkconfig --list ntpd

#vim /etc/ntp.conf

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# 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

# 中国这边最活跃的时间服务器 : http://www.pool.ntp.org/zone/cn

server 210.72.145.44 perfer   # 中国国家受时中心

server 202.112.10.36             # 1.cn.pool.ntp.org

server 59.124.196.83             # 0.asia.pool.ntp.org

# 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

# 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

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#service ntpd start

2、配置内网NTP-Clients

# yum install ntp

# chkconfig ntpd on

# chkconfig --list ntpd

#vim /etc/ntp.conf

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driftfile /var/lib/ntp/drift

restrict 127.0.0.1

restrict -6 ::1

# 配置时间服务器为本地的时间服务器

server 192.168.1.135

restrict 192.168.1.135 nomodify notrap noquery

server  127.127.1.0     # local clock

fudge   127.127.1.0 stratum 10

includefile /etc/ntp/crypto/pw

keys /etc/ntp/keys

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#service ntpd start

手动同步服务器时间

ntpdate -u 192.168.1.135

硬件时间与系统时间一起同步

# vim /etc/sysconfig/ntpd

SYNC_HWCLOCK=yes