Michael Davie updated AMBARI-21702:
    Priority: Critical  (was: Major)

> ambari-agent registration fails due to invalid public hostname
> --------------------------------------------------------------
>                 Key: AMBARI-21702
>                 URL: https://issues.apache.org/jira/browse/AMBARI-21702
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-agent
>    Affects Versions: 2.6.0
>         Environment: Networks with an active web proxy
>            Reporter: Michael Davie
>            Priority: Critical
> * The script {{hostname.py}} 
> (https://github.com/apache/ambari/blob/79cca1c7184f1661236971dac70d85a83fab6c11/ambari-agent/src/main/python/ambari_agent/hostname.py)
>  attempts to retrieve a host's public hostname from AWS from the location 
> * In a non-AWS network with a network proxy present, this request can return 
> an HTML login or redirect page, rather than the expected hostname value.
> * The script does not validate the length or format of the returned value, 
> and submits the returned HTML code to ambari-server as the public hostname.
> * Registration of the host fails, as the submitted HTML code exceeds the size 
> of the hostname field in the server's database (255 characters).
> * A functioning manual workaround has been published at 
> https://community.hortonworks.com/articles/42872/why-ambari-host-might-have-different-public-host-n.html.
> * An alternative workaround is to set the default gateway of the nodes to the 
> IP address of the Ambari server.

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