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https://issues.apache.org/jira/browse/AMBARI-12915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15180118#comment-15180118
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Robert Levas commented on AMBARI-12915:
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*I think that this is a bad idea*...
When Kerberos is enabled on the cluster, the Hadoop services (as well as some
other services like Oozie), internally perform a replacement on the {{_HOST}}
value in principal names. The mechanism to do this is not getting the
hostname value from the ambari-agent config or ambari-server command files. I
assume if uses something that generates a hostname value like {{hostname -f}}
by querying the network configuration.
Because of this, there will be a disconnect between service principal names
that ambari-agent scripts calculate and service principal names that Hadoop
services generate.
Additionally, when it comes to validation of the principal names between hosts,
a remote host will probably use DNS to determine the expected hostname and will
have no clue about the faked named provided in the ambari-agent config file.
> Make agent hostname configurable
> --------------------------------
>
> Key: AMBARI-12915
> URL: https://issues.apache.org/jira/browse/AMBARI-12915
> Project: Ambari
> Issue Type: Improvement
> Components: ambari-agent
> Affects Versions: 2.1.0
> Reporter: Greg Hill
> Assignee: Greg Hill
> Priority: Minor
> Attachments: AMBARI-12915.patch
>
>
> Currently the agent can either get the hostname from the local system, or you
> can inject a script to tell it what hostname to use using the
> 'hostname_script' config value. I would like to add a 'hostname' config
> value to the agent section of the agent config so we can just tell the agent
> what hostname to use.
> The scenario this comes up in is that our Ambari setup uses a local DNS
> domain for internal traffic, but the Ambari API has a public FQDN that we use
> for the API. It would be much cleaner for us to just specify the hostname in
> the config rather than jumping through hoops to generate a script to use to
> derive it.
> https://github.com/apache/ambari/blob/087d9003ecf6af33890e4f48743d7237a30d6438/ambari-agent/src/main/python/ambari_agent/hostname.py#L40
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