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, run the following command on each host:

RHEL/CentOS/Oracle 6
yum install -y ntp
RHEL/CentOS/Oracle 7
yum install -y ntp

To check that the NTP service will be automatically started upon boot, run the following command on each host:

RHEL/CentOS/Oracle 6
chkconfig --list ntpd
RHEL/CentOS/Oracle 7
systemctl is-enabled ntpd

To set the NTP service to auto-start on boot, run the following command on each host:

RHEL/CentOS/Oracle 6
chkconfig ntpd on
RHEL/CentOS/Oracle 7
systemctl enable ntpd

To start the NTP service, run the following command on each host:

RHEL/CentOS/Oracle 6
service ntpd start
RHEL/CentOS/Oracle 7
systemctl start ntpd