Centos 7 Ntp 服务器的配置

rpm -qa | grep ntp 

yum install -y ntp

[root@cdh01 ~]# yum install -y ntp
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.huaweicloud.com
 * updates: mirrors.huaweicloud.com
Resolving Dependencies
--> Running transaction check
---> Package ntp.x86_64 0:4.2.6p5-29.el7.centos will be installed
--> Processing Dependency: ntpdate = 4.2.6p5-29.el7.centos for package: ntp-4.2.6p5-29.el7.centos.x86_64
--> Processing Dependency: libopts.so.25()(64bit) for package: ntp-4.2.6p5-29.el7.centos.x86_64
--> Running transaction check
---> Package autogen-libopts.x86_64 0:5.18-5.el7 will be installed
---> Package ntpdate.x86_64 0:4.2.6p5-29.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

# Please consider joining the pool (http://www.pool.ntp.org/join.html).
===========================================================================================================================
 Package                         Arch                   Version                                 Repository            Size
===========================================================================================================================

vi /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 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.

#################################
###改这里
restrict 172.16.9.130 mask 255.255.255.0 nomodify notrap  #这里把ip地址改成你的master(本机)de ip地址
#########################################
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).

####+++++++++++++++++++++++++++++
#+++++++++++++++++++++++++++++++++
#下面的这些服务器全部注释掉
###################################

#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
#++++++++++++++++++++++++++++++++++
#注释在这里结束+++++++++++++++++++++++++
#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

# 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
#+++++++++++++++++++++++++++++++++++++++++++++++
#+++++最后加上这两句+++++++++++++++++++++++++++++++++
server 127.127.1.0
fudge 127.127.1.0 stratum 10
#以上所有的配置，先吧时间区域改成上海，再进行

chkconfig ntpd on



然后 启动服务


systemctl start ntpd

crontab -e

0-59/5 * * * * /usr/sbin/ntpdate cdh01