Question-36: Which is the minimum role required if you start and stop the service in Ambari?

Answer: If you want to stop or start a service then you need minimum Service Operator role.

Question-37: Can service Operator change the configurations?

Answer: No, to change the configuration, you minimally require the Service Administrator role.

Question-38: Who can delete the hosts from the cluster Service operator or Cluster operator?

Answer: If you want to delete the host from the cluster then you need the Cluster Operator role.

Question-39: Can Ambari hold the more then version of the components?

Answer: Yes, that is the beauty of this management and monitoring tool, it can hold more than one version of a particular component and any one of them you can mark as current version.

Question-40: If a corporate already maintaining LDAP and wanted to use the existing group of users in Ambari then is it possible?

Answer: Yes, it is possible. If you are an Ambari Administrator then you can import user and group information into Ambari from external LDAP system. You can manage both local as well as LDAP users using the Ambari. However, basic information regarding LDAP user will be inserted in the Ambari database. However, authentication would happen against external LDAP system only.