[GitHub] [zeppelin] Reamer opened a new pull request #3495: [ZEPPELIN-4397] Allow random userid for zeppelin process in container image

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Reamer opened a new pull request #3495: [ZEPPELIN-4397] Allow random userid for zeppelin process in container image
URL: https://github.com/apache/zeppelin/pull/3495
 
 
   ### What is this PR for?
   With this pull requests, we build zeppelin images, which are able to start as a random user. Random users are a security concept in some k8s products like Openshift ([reason](https://cookbook.openshift.org/users-and-role-based-access-control/why-do-my-applications-run-as-a-random-user-id.html))
   In start script we write a user entry in `/etc/passwd`, because a user entry is needed for Hadoop. Logins for zeppelin are not allowed (`/bin/false`).
   The zeppelin process doesn't need write access to binaries in zeppelin home folder. Only a few folder are writable.
   
   
   ### What type of PR is it?
   Improvement
   
   ### What is the Jira issue?
   * [ZEPPELIN-4397](https://issues.apache.org/jira/browse/ZEPPELIN-4397)
   
   ### How should this be tested?
   * First time? Setup Travis CI as described on https://zeppelin.apache.org/contribution/contributions.html#continuous-integration
   * Strongly recommended: add automated unit tests for any new or changed behavior
   * Outline any manual steps to test the PR here.
   
   ### How it can be tested
   - Build image
   - Run image with 
   ```bash
   # the number 12345 can be random, default 1000
   docker run -ti --user 12345 -p 8080:8080 -e ZEPPELIN_ADDR="0.0.0.0" my-zeppelin-image:latest
   ```
   
   ### Questions:
   * Does the licenses files need update?
     No
   * Is there breaking changes for older versions?
     No
   * Does this needs documentation?
     No
   

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