Hi @Cassandra Spencer, I did this recently, and it was easier than expected: Dump the Ambari database (ambari) into an sql file, and use sed or your favorite editor to change all hostnames in the sql file. Then, run "ambari-server reset", drop ambari DB, create it again, and import the edited sql file into Postgres. Of course take all the baskups beforehand. ambarirca database is not affected. Hive DB has no references to hosts. Oozie DB has refs to old hosts but you can leave them since it's about old jobs. Hue DB, if you use Hue has refs to old hosts, and has to be updated like ambari DB. After restarting Ambari with new hostnames I had no issues. If you can keep old hostnames as aliases there is no need to change ambari agents. Otherwise you need to change ambari agent properties, to redirect agents to the new Ambari server. Re iptables, that's unrelated to the above. You have to ensure that old required ports are opened. Starting with Ambari server and Ambari agent ports, and including all others. Also keep all ephemeral ports opened because ZooKeeper and some other components are using them.
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