Problems on Deploy

[carlosevi94]

Hello!

I'm trying to deploy my Django project on a ubuntu server for prepare the production version. But deploy its beeing so complicate. I have few experience deploying normal Django apps, but no experience with complex apps likes app with websockets or something.

On my local enviroment I have django with eventlet for capture the disconnect events on real time (its important for this project). For server side, first I tried with nginx + gunicorn but gunicorn throw a lots of problems, so I changed to nginx + django runserver.

I'm going to describe my problem:

When I deploy the code in the server, websocket no works, only polling request. Actually I don't know if this is caused by a wrong server configuration or a client problem.

When I use this method for connect var socket = io.connect() and I start a socket.io client connection, on my firefox shell, I see this error

Firefox is unable to establish a connection to the server in ws://my_ip_server/socket.io/?EIO=4&transport=websocket&sid=t_elLq2J0SDP6kweAAAA.  websocket.js:54:26

Polling request works and return 200 OK messages. On my development enviroment I don't see that error.

But if I use this method var socket = io.connect('http://my_ip_server', { transports: ["polling"] }); I don't see the error above (logicaly, I'm specifying to not use websocket) and the app works like on my local, but disconnect event is not catched on realtime (logicaly too).

I didn't find so many info about nginx + django + socket.io server deployment info, so I used a basic config for start. My nginx conf for this site is this

server {
    listen 80;
    server_name XXXXXX; 

   location / {
	 proxy_pass http://127.0.0.1:8000;
    }
}

I tryed too this another conf but the result is the same.

server {
    listen 80;
    server_name XXXXXX; 

   location / {
	 proxy_pass http://127.0.0.1:8000;
    }

   location /socket.io/ {
	 proxy_pass http://127.0.0.1:8000/socket.io/;
    }
}

I don't know if socket.io need another ports open and that is problem. I don't think it because I specified the port on wsgi.py with this lane

eventlet.wsgi.server(eventlet.listen(('127.0.0.1', 8000)), application)

What could be the problem??

Thanks for read!

versions

SO Server: Ubuntu 22.04
SO Local: Ubuntu 20.04

Server Python 3.8.13
Local Python: 3.8.10

Package            Version
------------------ -------
asgiref            3.5.2
Django             4.0.5
dnspython          1.16.0
eventlet           0.33.0
greenlet           1.1.2
gunicorn           20.1.0
python-dateutil    2.8.2
python-engineio    4.3.2
python-socketio    5.6.0

And the the 4.5.0 of socket.io for js client.

[miguelgrinberg]

@carlosevi94 Are you reading the python-socketio documentation? There is a lot of information regarding deployment there that you appear to not know about. I also recommend you look at the Flask-SocketIO documentation, which includes an example nginx configuration file, which will work exactly the same for your Django project.

Finally, my understanding is that django runserver is not supposed to be used in production. Be careful there, I recommend you go back to Gunicorn. See the docs referenced above for instructions.

[carlosevi94]

@miguelgrinberg Thanks for answer!!!

Using your nginx configuration file on Flask-SocketIO documentation make it works.
In fact I only need this lines on my nginx configuration file, in location section

      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";

But now I'm adapting my nginx conf file for get the best configuration as posible. Thanks!!

Thank for your recomendation. My intention is use gunicorn, but I have a lot of problems and I preferred to go back and go step by step to a stable version. Now I'm having another gunicorn problems (yesterday write on a question that describe the same problem than me).