Apache Ambari Installation
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Enable NTP on the Cluster and on the Browser Host

The clocks of all the nodes in your cluster and the machine that runs the browser through which you access the Ambari Web interface must be able to synchronize with each other.

To install the NTP service and ensure it's ensure it's started on boot, run the following commands on each host:

RHEL/CentOS/Oracle 6
yum install -y ntp
chkconfig ntpd on
RHEL/CentOS/Oracle 7
yum install -y ntp
systemctl enable ntpd
SLES
zypper install ntp
chkconfig ntp on
Ubuntu

apt-get install ntp
update-rc.d ntp defaults

Debian

apt-get install ntp
update-rc.d ntp defaults