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Configuring Gunicorn for Development and Production with Env Variables

blog/cards/configuring-gunicorn-for-development-and-production-with-env-variables.jpg

In this video we'll cover how to use the same gunicorn config file in dev and prod but still be able to tweak settings with env variables.

Quick Jump: Demo Video

I like to keep my development set up as close to production as possible and using environment variables is a great way to tweak a few settings depending on which environment I’m in without having to duplicate config files.

Demo Video

Code Snippets

Launching gunicorn from within a Dockerfile:

CMD ["gunicorn", "-c", "python:config.gunicorn", "snakeeyes.app:create_app()"]

Launching gunicorn without Docker:

gunicorn -c "python:config.gunicorn" "snakeeyes.app:create_app()"

The gunicorn config file in config/gunicorn.py:

# -*- coding: utf-8 -*-

import multiprocessing
import os

from distutils.util import strtobool


bind = os.getenv('WEB_BIND', '0.0.0.0:8000')
accesslog = '-'
access_log_format = "%(h)s %(l)s %(u)s %(t)s '%(r)s' %(s)s %(b)s '%(f)s' '%(a)s' in %(D)sµs"

workers = int(os.getenv('WEB_CONCURRENCY', multiprocessing.cpu_count() * 2))
threads = int(os.getenv('PYTHON_MAX_THREADS', 1))

reload = bool(strtobool(os.getenv('WEB_RELOAD', 'false')))

A few of the environment variables in the .env file:

# Which address and port should gunicorn bind to?
#WEB_BIND=0.0.0.0:8000

# Do you want code reloading to work with your app server? Don't do this in
# production (it's turned off by default, so don't worry about it).
WEB_RELOAD=true

# How many workers and threads should your app use?
WEB_CONCURRENCY=1
#PYTHON_MAX_THREADS=1

What are your favorite gunicorn config options? Let me know below.

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