Gunicorn is a popular WSGI server for Python.

It runs your Flask app with:

• multiple worker processes
• better stability than the dev server

Install

pip install gunicorn

pip install gunicorn

Create a WSGI entrypoint

wsgi.pywsgi.py:

from myapp import create_app
 
app = create_app()

from myapp import create_app
 
app = create_app()

Run gunicorn

gunicorn "wsgi:app" --bind 0.0.0.0:8000

gunicorn "wsgi:app" --bind 0.0.0.0:8000

Workers

A common rule of thumb:

• workers = 2 * CPU + 1workers = 2 * CPU + 1

Example:

gunicorn "wsgi:app" --workers 3 --bind 0.0.0.0:8000

gunicorn "wsgi:app" --workers 3 --bind 0.0.0.0:8000

Timeouts

If requests can be slow, configure timeouts:

• --timeout--timeout

But also ask: should this work be moved to background jobs?

Logging

Make sure logs go to stdout/stderr for containers:

• platforms can collect them automatically.