above is for RHEL6 for RHEL7 below # Setup NTPD
yum install -y ntp
systemctl is-enabled ntpd
systemctl enable ntpd
# enable firewall rules for ntp
firewall-cmd --add-service=ntp --permanent
firewall-cmd --reload
systemctl stop ntpd
ntpdate pool.ntp.org
systemctl start ntpd
systemctl status ntpd
echo "wait 30 sec for time to synchronize"
sleep 30
ntpq -p
date -R
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