1、安装NTP
sudo yum -y install ntp
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2、使用 ntpdate 测试 NTP
ntpdate pool.ntp.org
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3、查看服务器时间
date
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4、启动ntpd daemon，持续校准时间
systemctl start ntpd
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5、查看ntpd daemon是否启动
[root@localhost ~]# systemctl status ntpd
ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled)
Active: active (running) since Mon 2017-09-11 15:37:23 CST; 1h 49min ago
Process: 12142 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 12143 (ntpd)
Memory: 624.0K
CGroup: /system.slice/ntpd.service
12143 /usr/sbin/ntpd -u ntp:ntp -g