After you Kerberize the cluster and try to access the SAM UI for the first time, an Authentication Required message displays. To log into SAM for the first time and to create other users, you must log in with the streamline principal and keytab. Ambari creates the streamline principal and keytab during the Kerberos process.
Details of the principal and the keytab:
The keytab is called streamline.service.keytab and is located on the node where SAM is installed. It is located under /etc/security.
The principal name has the following convention: streamline-<cluster_name_lower_case>
After you have logged into SAM as the streamline user, you can create other users