1、配置 /etc/ntp.conf 如下：

# 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).

#记录上次的NTP server与上层NTP server联接所花费的时间
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.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap    #允许192.168.1.0/254子网内主机时间同步
restrict default nomodify notrap    #设置默认策略为允许任何主机进行时间同步
#restrict 192.168.0.207 mask 255.255.255.0 nomodify notrap     #只允许192.168.0.207主机时间同步

#设置此服务器同上层服务器做时间同步的IP地址
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org

#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

# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 8 

# 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

# Specify the key identifiers which are trusted.
#trustedkey 4 8 42

# Specify the key identifier to use with the ntpdc utility.
#requestkey 8

# Specify the key identifier to use with the ntpq utility.
#controlkey 8

# Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats

 

2、NTP server的维护

❤ 添加为服务
 chkconfig --level 345 ntpd on

❤ 启动
 service ntpd start
 或
 /etc/rc.d/init.d/ntpd start

❤ 停止
 service ntpd stop
 或
 /etc/rc.d/init.d/ntpd stop

❤ 管理命令
 ntpq –p     #查看本机和上层服务器的时间同步结果
 ntptrace     #可以用來追踪某台时间服务器的时间对应关系
 ntpdate IP   #客户端要和NTP server进行时钟同步

 cat /var/log/ntp/ntp.log   #查看ntp日志

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