Questions & Answers

I have a FastAPI API that I want to serve using gunicorn, nginx and docker compose.

I manage to make the FastApi and Gunicorn work with docker compose, now I add nginx. But I cannot manage to make it work. When I do curl http://localhost:80 I get this messsage: If you see this page, the nginx web server is successfully installed and working. Further configuration is required.

So this is my docker compose file:

version: '3.8'

services:
  web:
    build:
       dockerfile: Dockerfile.prod
       context: .
    command: gunicorn main:app --bind 0.0.0.0:8000 --worker-class uvicorn.workers.UvicornWorker
    expose:
      - 8000
    env_file:
      - ./.env.prod
  nginx:
   build:
      dockerfile: Dockerfile.prod
      context: ./nginx
   ports:
    - 1337:80
   depends_on:
    - web

On this one, if I set ports to 80:80 I get an error when the image is composed: Error starting userland proxy: listen tcp4 0.0.0.0:80: bind: address already in use, which I don't know why.

If I put [some random number]:80 (e.g. 1337:80) then the docker build works, but I get the If you see this page, the nginx web server is successfully installed but... error message state before. I think 1337 is not where nginx is listening, and that's why.

This is my nginx conf file:

upstream platic_service {
    server web:8000;
    }

server {

    listen 80;

     location / {
        proxy_pass http://platic_service;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_redirect off;
    }

I tried to change it to listen to 8080 but does not work.

What am I doing wrong?