[GitHub] [zeppelin] Leemoonsoo opened a new pull request #3450: [ZEPPELIN-4166] Change default binding address to 127.0.0.1 (previously 0.0.0.0)

[GitBox <gi...@apache.org>]

Leemoonsoo opened a new pull request #3450: [ZEPPELIN-4166] Change default binding address to 127.0.0.1 (previously 0.0.0.0)
URL: https://github.com/apache/zeppelin/pull/3450
 
 
   ### What is this PR for?
   This PR changes default Zeppelin server binding address from `0.0.0.0` to `127.0.0.1`.
   Also update related configuration templates and document.
   
   ### What type of PR is it?
   mprovement
   
   ### What is the Jira issue?
   https://issues.apache.org/jira/browse/ZEPPELIN-4166
   
   ### How should this be tested?
   Build and run Zeppelin server with default configuration and see if default port is listening in address 127.0.0.1 instead of 0.0.0.0 (netstat -na | grep 8080) 
   
   ### Questions:
   * Does the licenses files need update? no
   * Is there breaking changes for older versions? no
   * Does this needs documentation? yes
   

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