1.下载

http://www.rpmfind.net/linux/rpm2html/search.php?query=autogen-libopts&submit=Search+…&system=&arch=

ntp-4.2.6p5-28.el7.centos.x86_64.rpm
ntpdate-4.2.6p5-28.el7.centos.x86_64.rpm
libopts-5.18.12-alt2.x86_64.rpm

2.安装

rpm -ivh autogen-libopts-5.18-5.el7.x86_64.rpm

rpm -ivh ntpdate-4.2.6p5-29.el7.centos.2.x86_64.rpm

rpm -ivh ntp-4.2.6p5-29.el7.centos.2.x86_64.rpm

3.配置，启动

七，时间配置
[root@localhost ~]# systemctl enable ntpd 启用ntp服务
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
[root@localhost ~]# systemctl start ntpd开始ntp服务
[root@localhost ~]# systemctl status ntpd显示ntp服务状态
[root@localhost ~]# vi /etc/ntp.conf jin’x进行ntp.conf的配置
https://www.cnblogs.com/Sungeek/p/10197345.html