$ sudo apt-get install gunicorn

Otra opción

pip install gunicorn

In cringier_app file

gunicorn -w 4 -b 0.0.0.0:80 cringer_app:app

Gunicorn’s main process starts one or more worker processes, and restarts them if they die. To ensure the workers are still alive, Gunicorn has a heartbeat system. The default directory for the heartbeat file is in /tmp, which in some Linux distributions is stored in memory via tmpfs filesystem. Docker containers, however, do not have /tmp on tmpfs.

One option is to mount a tmpfs or ramfs in-memory filesystem onto /tmp, using Docker’s volume support. This will work, but not everywhere: not all environments that run Docker containers support arbitrary volumes.

A more general solution is to tell Gunicorn to store its temporary file elsewhere.

gunicorn --worker-tmp-dir /dev/shm

If you only have one worker, and it’s stuck handling a slow query, the heartbeat query will timeout. Start at least two workers, and probably also start a number of threads using the gthread worker backend.

gunicorn --workers=2 --threads=4 --worker-class=gthread

Speaking of nginx, you don’t always nedd nginx or another proxy in front Gunicorn. Many container deployment systems already have a HTTP load balancer/reverse proxy built-in, in which case Gunicorn isn’t being exposed directly to HTTP clients anyway.

gunicorn rema.wsgi:application --bind 0.0.0.0:8000 --worker-tmp-dir ~ --workers=2 --threads=4 --worker-class=gthread