Access Ambari Admin page
As an Ambari administrator, you use the Admin page to perform tasks that require Ambari-level permissions.
From the user menu, click the Manage
The user menu displays the user name of the current user. The Manage Ambari option appears only for users assigned Ambari Administrator access to the cluster.If Ambari Server is stopped, you can restart it using a command line editor.
If necessary, start Ambari Server on the Ambari Server host machine.
ambari-server startTypically, you start the Ambari Server and Ambari Web as part of the installation process.