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How to deploy any Python Web Application?
Hey everyoneπ¨βπ»
In this blog post I will explain how you can deploy any ASGI/WSGI compliant Python Web App.
Only ASGI Compliant Frameworks can be deployed using this method, other frameworks can't be deployed.
- NGINX
- Hypercorn
- FastAPI
- Gunicorn
- Uvicorn
- Daphne
- Flask
- Django
- Starlette
- Any ASGI/WSGI compliant framework
Setup your framework using the docs mentioned.
Since I'll be using FastAPI, my main.py
looks like this
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
def hello_world():
return f"Hello World"
π We now have a FastAPI app ready, we now have to deploy it using NGINX. βοΈ
Depending upon your framework and choice of ASGI/WSGI Server, this process will be slightly different.
For Django Devs:
Your wsgi/asgi application would be called as <application_name>.<a/w>sgi:application
Choose ASGI or WSGI clearly and stay with that option throughout
For Flask Devs:
If your app is in main.py, it would be called as main:app
In this step we'll be binding the web-server to UNIX socket. Learn more about UNIX Sockets. here
I am attaching the docs of Daphne, Uvicorn and Gunicorn down which use different flags to bind the application to a port.
Run this command to bind it to the socket
hypercorn -b 'unix:/var/tmp/hypercorn.sock' -w 4 main:app
In this -w
defines the number of workers.
Change hypercorn.sock
to the server which you choose to use.
Change the socket name according to your web server
π Now we have our app listening on the hypercorn.sock
.
We've to proxy this socket to NGINX and route NGINX to listen to the hypercorn
socket.
worker_processes 1;
events {
worker_connections 512;
}
http {
server {
listen 8080;
server_name "localhost";
access_log /var/log/nginx/access.log;
error_log /var/log/error.log ;
location / {
proxy_pass http://unix:/var/tmp/hypercorn.sock;
}
}
}
I'll briefly explain this config file:
- Worker_processes => 1 worker process has been assigned for this specific task/process
- Worker connections => Number of connections that can be handled by 1 process
- Listen => Listens at the mentioned port
- Server Name => Listens at this domain
- Access_log => The file location at which access log is stored, access log stores requests made
- Error_log => The file location at which error log is stored.
- Proxy Pass => The socket/port which needs to be proxied.
This file should change based on your socket but the other configuration can be the same.
π Save this file as nginx.conf
Feel free to read about NGINX here
Once this file is made, save it at /etc/nginx/
Either you can use docker to run a Linux server or shell into an instance.
If you want to copy it to docker.
COPY nginx.conf /etc/nginx/
π£ You are ready to launch except one last step
- You have now wonderfully setup your web-server and the NGINX proxy π
- You are just one-step away from accessing the port, and perhaps this is the β or β step
Currently, NGINX can't read or write from the socket, so we need to change access mode
To do this, run the following command:
chmod 777 /var/tmp/<socket>
sudo service nginx restart
πNow you can listen from the port 8080, http://localhost:8080
If you are using systemctl, please use this command instead:
sudo systemctl restart nginx
Play around with NGINX config as you wish based on your application's requirements.
Thanks for readingπ§βπ
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