第一步：

選擇一個服務器作為時間同步服務器，如IC-1(IP:192.168.1.101)

在IC-1中，編輯文件/etc/ntp.conf

# 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.

#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

# Use public servers from the pool.ntp.org project.

# Please consider joining the pool (http://www.pool.ntp.org/join.html).

#server 0.rhel.pool.ntp.org iburst

#server 1.rhel.pool.ntp.org iburst

#server 2.rhel.pool.ntp.org iburst

#server 3.rhel.pool.ntp.org iburst

server 127.127.1.0

fudge 127.127.1.0 stratum 10

#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

# 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

如上配置，其中

server 127.127.1.0

fudge 127.127.1.0 stratum 10

是新加的配置，這是讓本機的ntpd和本地硬件時間同步。

#server 0.rhel.pool.ntp.org iburst

#server 1.rhel.pool.ntp.org iburst

#server 2.rhel.pool.ntp.org iburst

#server 3.rhel.pool.ntp.org iburst

為注釋掉的配置信息。

第二步，啟動服務：

/etc/init.d/ntpd start

第三步，在其他節點，開啟定時任務，同步時間即可

crontab -e

01 ? * ? * ? * ? * ntpdate 192.168.1.101

總結

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