Updated Dockerfile to be flexible (#66)

* Updated Dockerfile to be flexible

* Update

README.md

@@ -47,6 +47,16 @@ $ docker run -p 5000:5000 amundsendev/amundsen-metadata
 $ curl -v http://localhost:5000/healthcheck
 ```
 
+## Instructions to start the service from Docker image with gunicorn (production use case)
+Note that there below command uses default config of gunicorn. Please visit [Gunicorn homepage](https://gunicorn.org/ "Gunicorn") for more information.
+```bash
+$ docker pull amundsendev/amundsen-metadata:latest
+$ docker run -p 5000:5000 amundsendev/amundsen-metadata gunicorn --bind 0.0.0.0:5000 metadata_service.metadata_wsgi
+
+-- In different terminal, verify getting HTTP/1.0 200 OK
+$ curl -v http://localhost:5000/healthcheck
+```
+
 ## Production environment
 By default, Flask comes with Werkzeug webserver, which is for development. For production environment use production grade web server such as [Gunicorn](https://gunicorn.org/ "Gunicorn").
 

public.Dockerfile

@@ -3,6 +3,6 @@ WORKDIR /app
 COPY . /app
 RUN pip3 install -r requirements.txt
 RUN python3 setup.py install
+RUN pip3 install gunicorn
 
-ENTRYPOINT [ "python3" ]
-CMD [ "metadata_service/metadata_wsgi.py" ]
+CMD [ "python3", "metadata_service/metadata_wsgi.py" ]

setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-__version__ = '1.0.15'
+__version__ = '1.0.16'
 
 
 setup(