NTP CentOS

clear
yum install -y chrony ntp ntpdate
systemctl status ntpd
systemctl restart ntpd
systemctl start chronyd
systemctl enable chronyd
systemctl status chronyd
ntpdate -u pool.ntp.org
echo "0 * */5 * *  /usr/sbin/ntpdate pool.ntp.org 2>&1 >/dev/null"   >> /var/spool/cron/root
timedatectl