ntp server
http://www.pool.ntp.org/zone/cn# yum install ntp
# vi /etc/ntp.conf
server 1.cn.pool.ntp.org server 0.asia.pool.ntp.org
server 2.asia.pool.ntp.org
/// /// firewall
# firewall-cmd --add-service=ntp --permanent
# firewall-cmd --reload
/// /// systemctl
# systemctl start ntpd
# systemctl enable ntpd
# systemctl status ntpd
Reference : http://www.tecmint.com/install-ntp-server-in-centos/
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