Hướng dẫn cài đặt NTP đồng bộ time trên Centos 7
 

yum install ntp -y

systemctl start ntpd
touch /var/spool/cron/crontabs
touch /var/spool/cron/root
chmod 777 /var/spool/cron/*

echo "*/1 * * * * /usr/sbin/ntpdate -b -s 2.pool.ntp.org" >> /var/spool/cron/crontabs
echo "*/1 * * * * /usr/sbin/ntpdate -b -s 2.pool.ntp.org" >> /var/spool/cron/root

systemctl restart crond
/usr/sbin/ntpdate -b -s 2.pool.ntp.org


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