Move gunicorn config to file and set path envvar.

votingapi/.dockerignore

@@ -5,3 +5,4 @@ README.md
 *.pyd
 __pycache__
 .pytest_cache
+*~

votingapi/Dockerfile

@@ -34,9 +34,9 @@ COPY . ./
 
 ENV PORT=8000
 
-# Run the web service on container startup. Here we use the gunicorn
-# webserver, with one worker process and 8 threads.
-# For environments with multiple CPU cores, increase the number of workers
-# to be equal to the cores available.
-# Timeout is set to 0 to disable the timeouts of the workers to allow Cloud Run to handle instance scaling.
-CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 voting.api:app
+# Sets the url path prefix.
+ENV SCRIPT_NAME=/votingapi
+
+# Run the web service on container startup with gunicorn.
+# See gunicorn.conf.py for configuration.
+CMD exec gunicorn voting.api:app

votingapi/gunicorn.conf.py

@@ -0,0 +1,9 @@
+import multiprocessing
+import os
+
+PORT = os.environ["PORT"]
+
+bind = f":{PORT}"
+workers = multiprocessing.cpu_count() * 2 + 1
+# Timeout is set to 0 to disable the timeouts of the workers to allow Cloud Run to handle instance scaling.
+timeout = 0