[jira] [Created] (MINIFI-541) Update Dockerfile to Follow Docker Best Practices

["Syed Shah (Jira)" <ji...@apache.org>]

Syed Shah created MINIFI-541:
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             Summary: Update Dockerfile to Follow Docker Best Practices
                 Key: MINIFI-541
                 URL: https://issues.apache.org/jira/browse/MINIFI-541
             Project: Apache NiFi MiNiFi
          Issue Type: Improvement
          Components: Docker
            Reporter: Syed Shah


The Dockerfiles in the repository could use a fair bit of tidying up.

The biggest issue is that there are so many layers being created in the Dockerfiles.
These make image build times huge and increased the final size of the image substantially.

For example, building `minify-docker/dockerhub/Dockerfile` currently creates a 236 MB image.
By just grouping the `RUN` commands together, this can be reduced to 161 MB,
because we've reduced the total number of layers of the image.

See: https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#minimize-the-number-of-layers

Also, the of the `MAINTAINER` keyword with was deprecated back in 2017. 
This should be a `LABEL` called `maintainer` instead.

See: https://docs.docker.com/engine/deprecated/#maintainer-in-dockerfile

Finally, in some the `ADD` keyword can be put above `RUN`, and the `mkdir` commands
removed since the directory and any parent directories are automatically
created by Docker by performing the `ADD/COPY` command.



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