服务端配置：
1、安装chrony软件
root@B-OPS-75-1:~# apt install chrony –y
2、修改配置文件
#pool 2.debian.pool.ntp.org offline iburst #注释此行
server time1.aliyun.com iburst #并添加时间服务器，此处选择的是阿里的时间服务器
server time2.aliyun.com iburst
server time3.aliyun.com iburst
server time4.aliyun.com iburst
server time5.aliyun.com iburst
server time6.aliyun.com iburst
server time7.aliyun.com iburst
allow 10.2.75.0/16 #打开允许同步的IP段
3、启动，查看状态，查看同步源
root@B-OPS-75-1:~# systemctl restart chrony
root@B-OPS-75-1:~# systemctl status chrony
● chrony.service - LSB: Controls chronyd NTP time daemon
Loaded: loaded (/etc/init.d/chrony; bad; vendor preset: enabled)
Active: active (exited) since Mon 2018-10-08 21:59:18 EDT; 1min 57s ago
Docs: man:systemd-sysv-generator(8)
Oct 08 21:59:18 B-OPS-75-1 systemd[1]: Starting LSB: Controls chronyd NTP time daemon...
Oct 08 21:59:18 B-OPS-75-1 chrony[5172]: Invalid command at line 20 in file /etc/chrony/chrony.conf
Oct 08 21:59:18 B-OPS-75-1 systemd[1]: Started LSB: Controls chronyd NTP time daemon.
root@B-OPS-75-1:~# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 203.107.6.88 2 6 7 0 +8787ns[ -53us] +/- 23ms
root@B-OPS-75-1:~# vim /etc/chrony/chrony.conf
root@B-OPS-75-1:~# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 203.107.6.88 2 6 377 11 -227us[ -730us] +/- 19ms
客户端配置：
1、安装服务
root@B-OPS-75-2:~# apt install chrony –y
2、修改配置文件
root@B-OPS-75-2:~# vim /etc/chrony/chrony.conf
#pool 2.debian.pool.ntp.org offline iburst #注释此行
server 10.2.75.1 iburst #添加同步源
3、启动服务并查看同步源
root@B-OPS-75-2:~# service chrony restart
root@B-OPS-75-2:~# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 10.2.75.1 3 6 37 32 +730ns[ +811us] +/- 27ms
