一、安装Chrony服务

[root@nfs-node2 ~]# yum -y install chrony

二、配置Chrony服务

[root@nfs-node2 ~]# vim /etc/chrony.conf 
driftfile /var/lib/ntp/drift
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1 
restrict -6 ::1

#允许某个网段使用ntp服务
allow 10.0.0.0/24

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
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys

三、启动服务、配置开机自启动

[root@nfs-node2 ~]#/etc/rc.d/init.d/chronyd start 
正在启动 ntpd：                                            [确定]
[root@nfs-node2 ~]# chkconfig chronyd on

四、配置防火墙允许访问Chrony服务

[root@nfs-node2 ~]# iptables -I INPUT -p udp -m state --state NEW -m udp --dport 123 -j ACCEPT 

五、测试工作是否正常

[root@nfs-node2 ~]# chronyc sources 
 remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*85.199.214.101  .GPS.            1 u   61   64    1  310.385   -3.302   2.834
+static-5-103-13 .GPS.            1 u  122   64    2  410.189  -23.476   3.488
+cn.ntp.faelix.n 185.134.196.169  2 u   57   64    3  159.115  -10.413   0.547