Aldrin Piri created NIFI-4878:

             Summary: Update Docker docs to include all environment variables 
used on startup
                 Key: NIFI-4878
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Docker, Documentation & Website
            Reporter: Aldrin Piri
             Fix For: 1.5.0

-NIFI-4824- provided updates to allow specification of the various ports in the 
container on startup via varying environment variables to aid the issue of the 
host whitelisting.

It does not appear this information is readily available in our docs and has 
caused some confusion by users when trying to connect to an instance.  We need 
to update the docs to enumerate these scenarios as well as the environment 
variables that are anticipated.  

We could additionally enhance the experience via performing some logical 
checks.  One example could be verifying that if a custom port is set and we are 
running secure, there is also an environment variable provided.  Additionally, 
providing variables that would be unused, such as NIFI_WEB_HTTP_PORT when we 
are running secure could also cause an error/warning. 

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