[jira] [Created] (AMBARI-20787) Ambari agent should log how it determines it's FQDN

["Sebastian Toader (JIRA)" <ji...@apache.org>]

Sebastian Toader created AMBARI-20787:
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             Summary: Ambari agent should log how it determines it's FQDN
                 Key: AMBARI-20787
                 URL: https://issues.apache.org/jira/browse/AMBARI-20787
             Project: Ambari
          Issue Type: Improvement
          Components: ambari-agent
    Affects Versions: 2.4.0
            Reporter: Sebastian Toader
            Assignee: Sebastian Toader
             Fix For: 2.5.1


Ambari agent determines its FQDN that will use for registering with Ambari Server as follows:
# invokes the script specified by {{hostname_script}} in ambari-agent.ini and uses the output of this script as host name to register with.
# if the script mentioned above returned with a non-zero error code (or threw an exception) than falls back to  [socket.getfqdn|https://docs.python.org/2/library/socket.html#socket.getfqdn] python api call.
# if {{hostname_script}} is not set in  ambari-agent.ini than it uses [socket.getfqdn|https://docs.python.org/2/library/socket.html#socket.getfqdn] python api call.

Currently the agent doesn't log anything about how it obtained its FQDN which makes troubleshooting difficult in case it registers with Ambari Server using unexpected/wrong FQDN.



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