Running FastAPI in docker with uvicorn and gunicorn nginx

Question

I am trying to build a FastAPI application with ubuntu 22.04 docker image, gunicorn and uvicorn and nginx as webserver. Gunicorn and uvicorn services are started using supervisord.

python is installed in a virtual environment located in /opt/venv

Dockerfile

FROM ubuntu:22.04
LABEL maintainer="test"
ENV GROUP_ID=1000 \
    USER_ID=1000
RUN apt-get update && apt-get install -y apt-transport-https ca-certificates supervisor procps cron python3.10-venv python3-gdbm wget gnupg unzip curl
WORKDIR /app
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
ENV VIRTUAL_ENV=/opt/venv
RUN python3 -m venv $VIRTUAL_ENV
ENV PATH="$VIRTUAL_ENV/bin:$PATH"
RUN ["python", "-m", "pip", "install", "--upgrade", "pip", "wheel"]
RUN apt-get install -y  python3-wheel
COPY ./requirements.txt /app/requirements.txt
RUN ["python", "-m", "pip", "install", "--no-cache-dir", "--upgrade", "-r", "/app/requirements.txt"]
COPY ./app /app
RUN which python

nginx is using a separate docker image. Mongodb is the database and the content of docker-compose is

docker-compose.yml

version: '3.10'
services:
  web:
    container_name: "fastapi"
    build: ./
    volumes:
      - ./app:/app
    ports:
      - "8000:8000"
    environment:
      - DEPLOYMENT_TYPE=production
    depends_on:
      - mongo
    links:
      - mongo

  nginx:
    container_name: "nginx"
    restart: always
    image: nginx
    volumes:
      - ./app/nginx/conf.d:/etc/nginx/conf.d
    ports:
      - 80:80
      - 443:443
    links:
      - web

python packages are specified in requirements.txt

requirements.txt

setuptools>=59.1.1,<59.7.0 
fastapi==0.87.0 
uvicorn==0.19.0 
gunicorn==20.1.0
python-decouple==3.5

nginx configuration file is

app.conf

upstream web {
    server web:8000;
}

server {

    listen 80;
    charset utf-8;
    server_name 0.0.0.0;
    client_max_body_size 20m;
    proxy_read_timeout 300;
    proxy_connect_timeout 300;
    proxy_send_timeout 300; 

    location / {
        proxy_pass http://web/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

}

uvicorn and gunicorn are started using supervisor

supervisord.conf

[supervisord]
nodaemon=true

[program:fastapi_guni]
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0
command=/opt/venv/bin/gunicorn app.main:app --workers 4 --name main --worker-class /opt/venv/bin/uvicorn.workers.UvicornWorker --host 0.0.0.0:8000 --reload

the python main.py is

main.py

import uvicorn
from fastapi.middleware.cors import CORSMiddleware
from fastapi import FastAPI
from app.routes.api import router as api_router

app = FastAPI()

origins = ["http://localhost:8000"]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(api_router)

if __name__ == '__main__':
    uvicorn.run(host='127.0.0.1', debug=True, port=8000, log_level="info", reload=True)
    print("running")

when i try to bring up the containers, fastapi container will get stopped immediately once the container starts with the following message

fastapi exited with code 0

and nginx will also get stopped throwing the following message

nginx            | 2022/11/15 19:10:46 [emerg] 1#1: host not found in upstream "web:8000" in /etc/nginx/conf.d/app.conf:2
nginx            | nginx: [emerg] host not found in upstream "web:8000" in /etc/nginx/conf.d/app.conf:2
nginx exited with code 1

I am sitting on this for several hours and how can bring the service up and running.

update

Folder structure

Running FastAPI in docker with uvicorn and gunicorn nginx

Answers (1)

Related Questions