I encountered the following error when trying to regenerate keytabs. I have recently upgraded from HDP 2.6 to HDP 3.0. I am using FreeIPA. The name of the host of the ambari server is not ambari_server -- I am not sure why it tries to create a new principal HTTP/ambari_server@REALM. 2018-10-09 17:17:00,700 - Failed to create principal, HTTP/ambari_server@ZXCOMPUTERS.COM - Failed to create principal for HTTP/ambari_server@ZXCOMPUTERS.COM
STDERR: ipa: ERROR: The host 'ambari_server' does not exist to add a service to.
2018-10-09 17:17:21,815 - Failed to create principal, - Failed to create new principal - no principal specified
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