Use gunicorn

use gunicorn, which is a production-ready WSGI server

Dockerfile

@@ -13,5 +13,5 @@ EXPOSE 5000
 
 ENV PYTHONUNBUFFERED=1
 
-CMD ["python", "app.py"]
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "-w", "1", "app:app"]
 

requirements.txt

@@ -2,3 +2,4 @@ flask
 requests
 geopy
 geonamescache
+gunicorn