How to customize webapp hostname for UI server ?

[#1]

Hi everybody

By default most UI address (for hdfs datanode, yarn nodemanager, etc) are started on http://<hostname's fqdn>:port (50075, 8042, etc).

I do not achieve to change the default server name... which is important to me for I'd like to expose these ports to an all users network and restrict internal communication to a dedicated one... I unsuccessully tried to change yarn.nodemanager.webapp.address to alter the hostname... I also tried to play with public_hostname.sh to define a public hostname but webservers don't seem to start on it?

Did someone already achieve to do this ?

Regards

[#2]

Just to confirm, all these steps were done?

https://docs.hortonworks.com/HDPDocuments/Ambari-2.4.2.0/bk_ambari-reference/content/how_to_customiz...