2、修改slave1上的ntp配置文件（ntpserver） # vi /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).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 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 ::1# Hosts on local network are less restricted.
restrict 180.201.0.0 mask 255.255.192.0 nomodify notrap# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).server 210.72.145.44 iburst prefer
server 202.112.10.36 iburst
server 59.124.196.83 iburstrestrict 210.72.145.44 modify notrap noquery
restrict 202.112.10.36 modify notrap noquery
restrict 59.124.196.83 modify notrap noqueryserver 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.
#cryptoincludefile /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# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limited restriction flag.
disable monitor
介绍请见
3、修改master和slave2上的ntp配置文件（ntpclient） # vi /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).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 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 ::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 slave1 iburst
restrict slave1 mask nomodify notrap noqueryserver 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.
#cryptoincludefile /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# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limited restriction flag.
disable monitor
介绍如下：
4、启动
# service ntpd start -- 启动ntp # chkconfig ntpd on --开机启动 # service ntpd status --查看状态
# ntpstat查看同步情况，如下则表示启动成功
synchronised to NTP server (85.199.214.101) at stratum 2 time correct to within 155 mspolling server every 64 s
