It's not clear which version of Ambari this is for. Maybe 2.0? Current steps (Ambari 2.1/2.2, HDP 2.3/2.4 and OneFS 7.2.1.2/8.0.0.1) for most easily completing Kerberos configuration are linked in answer to this question: https://community.hortonworks.com/questions/38583/configure-kerberos-using-ambari-with-emc-isilon.html
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