Issues deploying the project in django using nginx, gunicorn

[AdnaneSaber]

I would like to deploy this project which works perfectly on localhost or on python manage.py runserver command, when I try to deploy it I read on the documentation on the worker you should add these to gunicorn service which when I do -k eventlet -w 1, it returns 502 bad gateway This is what i'm getting based off https://github.com/miguelgrinberg/python-socketio/tree/main/examples/server/wsgi/django_example This is my gunicorn service

[Unit]
Description=gunicorn daemon
Requires=dev.socket
After=network.target
[Unit]
Description=gunicorn daemon
Requires=dev.socket
After=network.target

[Service]
User=myuser
Group=www-data
WorkingDirectory=/var/lib/jenkins/workspace/myproject
ExecStart=/var/lib/jenkins/workspace/myproject/env/bin/gunicorn \
          --access-logfile - \
          --workers 3 \
          -k eventlet \
          --bind unix:/run/dev.sock \
          myproject.wsgi:application
[Install]
WantedBy=multi-user.target

wsgi.py

import os

from django.core.wsgi import get_wsgi_application
import socketio

from app.views import sio

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')

wsgi_application = get_wsgi_application()
application = socketio.WSGIApp(sio, wsgi_application)

settings.py

...
WSGI_APPLICATION = 'myproject.wsgi.application'
...

If I remove the -k eventlet from the dev.service gunicorn service, the 502 bad gateway goes away and the page keeps loading forever and it returns 504 Gateway Time-out, and if I revert back wsgi.py to it's django by default boilerplate, it shows the page, but the websockets doesn't work and the page keeps sending https://example.com/socket.io/?EIO=4&transport=polling&t=opIU5ZA GET requests, that gets 502 bad gateway

[miguelgrinberg]

Please do not write bugs on this project when all you need is help making your application work. The discussion board is for this purpose.

[AdnaneSaber]

I am not ignoring your words, and what I tried to say, is that i guess that it can't be coming from the proxy unless I forgot the add something or misadded something, because before trying to integrate python-socketio it was working fine, that's all i meant by when I remove the argument from gunicorn and revert wsgi.py it works, sorry if I less explained , this is my nginx configuration file located in /etc/nginx/sites-available/myproject

server {
    listen 80;
    server_name IP-V6;
    return 302 $scheme://example.com$request_uri;
}

server {
    server_name example.com;
    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /var/lib/jenkins/workspace/myproject;
    }
    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }


    location /socket.io {
        include proxy_params;
        proxy_http_version 1.1;
        proxy_buffering off;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_pass http://localhost:8006/socket.io;
    }
}

and this is runserver.py
on myproject/myapp/management/commands/runserver.py

from django.core.management.commands.runserver import Command as RunCommand
import eventlet
from myapp.wsgi import application

class Command(RunCommand):
    help = 'Run the Socket.IO server'

    def handle(self, *args, **options):
        eventlet.wsgi.server(eventlet.listen(('', 8006)), application)

thank you for you time

[miguelgrinberg]

Are you using a unix socket or port 8006? Your nginx configuration has both, so either your Socket.IO or your non-Socket.IO endpoints are going to 502, I think.

[AdnaneSaber]

Before integrating socketio, i didn't use port 8006, but since on the docs I read that eventlet needs to listen on localhost with a port, so I added it, and probably it's the reason, can it be configured with unix socket ? don't mind me I am no expert in servers

[miguelgrinberg]

I'm not really sure I follow. Using the eventlet server is one thing, but you are using Gunicorn, right? So the eventlet web server doesn't really matter at all here. Also, what does the runserver command has to do with your production deployment if your service is configured to run Gunicorn?

Based on what I see, you should configure your proxy server to forward both HTTP and WebSocket to your unix socket, on which Gunicorn is listening. And you should use the eventlet worker with Gunicorn.

If you decide to drop eventlet, then change the async_mode to something else as well.

[AdnaneSaber]

Thank you so much @miguelgrinberg for your support.
I managed to make it work this way, i'll share the code
/etc/nginx/sites-available/myproject

server {
    server_name example.com;
    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /var/lib/jenkins/workspace/myproject;
    }
    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }


    location /socket.io {
        include proxy_params;
        proxy_http_version 1.1;
        proxy_buffering off;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_pass http://unix:/run/gunicorn.sock;
    }
 }

/etc/systemd/system/gunicorn.service

[Unit]
Description=gunicorn daemon
Requires=gunicorn.socket
After=network.target

[Service]
User=myuser
Group=www-data
WorkingDirectory=/var/lib/jenkins/workspace/myproject
ExecStart=/var/lib/jenkins/workspace/myproject/env/bin/gunicorn \
          --log-file=- \
          -k eventlet \
          -w 1 \
          --bind unix:/run/gunicorn.sock \
          myproject.wsgi:application
[Install]
WantedBy=multi-user.target

myproject/wsgi.py

import os
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
from django.core.wsgi import get_wsgi_application
import socketio
from websocketapp.views import sio
wsgi_application = get_wsgi_application()
application = socketio.WSGIApp(sio, wsgi_application)

i think the environment variable set should be before the socketio imports for some reason.
This is the config that worked for me, thank you so much again and I loved the python-socketio project, i hope this discussion could help someone in the future.