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Debian – FastAPI instance not working with docker on windows machine

I have problem with my FastAPI based app. Locally my application is working just fine, but when trying to run it with docker, then i can’t connect with it. Also tried on different machine with Ubuntu installed, and it is working just fine as it is.

Also tried with different container using flask application on port 8080, and it is working just fine.

.
└── root_directory/
    ├── venv/
    ├── .gitignore
    ├── database.py
    ├── docker-compose.yaml
    ├── Dockerfile
    ├── main.py
    ├── models.py
    ├── README.md
    └── requirements.txt

main.py file

from fastapi import FastAPI

app = FastAPI()

@app.get("/hello")
def hello_world():
    return "hello"

Dockerfile

FROM tiangolo/uvicorn-gunicorn-fastapi:python3.11
ENV PYTHONBUFFERED True
WORKDIR /app
COPY . .
WORKDIR /app
RUN pip install --upgrade pip
RUN pip install -r requirements.txt

docker-compose.yaml

version: "3.8"

services:
  api:
    container_name: api
    build:
      context: .
    command: uvicorn main:app --host 0.0.0.0 --port 8000 --reload
    volumes:
      - ./:/app
    ports:
      - "8000:8000"
  db:
    image: postgres
    restart: always
    environment:
      POSTGRES_PASSWORD: example
      POSTGRES_USER: host
      POSTGRES_DB: movies_app
    ports:
      - '5432:5432'

Logs that containers are returning

api   | INFO:     Will watch for changes in these directories: ['/app']
api   | INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
api   | INFO:     Started reloader process [1] using WatchFiles
db-1  | 
db-1  | PostgreSQL Database directory appears to contain a database; Skipping initialization
db-1  | 
db-1  | 2024-01-11 02:37:33.905 UTC [1] LOG:  starting PostgreSQL 16.1 (Debian 16.1-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
db-1  | 2024-01-11 02:37:33.905 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
db-1  | 2024-01-11 02:37:33.905 UTC [1] LOG:  listening on IPv6 address "::", port 5432
db-1  | 2024-01-11 02:37:33.908 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db-1  | 2024-01-11 02:37:33.912 UTC [29] LOG:  database system was shut down at 2024-01-11 02:37:25 UTC
db-1  | 2024-01-11 02:37:33.914 UTC [1] LOG:  database system is ready to accept connections
api   | INFO:     Started server process [8]
api   | INFO:     Waiting for application startup.
api   | INFO:     Application startup complete.

As you can see there are not logs that shows that client tried to connect to api server

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2

Answers


  1. Chosen as BEST ANSWER
    0

    So if anyone have same issue, then i found solution that is working for me.

    Original answer was found here

    Solution step by step:

    • Get into terminal of your WSL instance that docker is using

    • Type ip addr show eth0 | grep -oP '(?<=inets)d+(.d+){3}' into the shell to get ip of your WSL instance

    • Type netsh interface portproxy add v4tov4 listenport=8000 listenaddress=0.0.0.0 connectport=8000 connectaddress=x.x.x.x into your terminal, where connectaddress is your WSL ip from second step, and listenport, and connectport are equal to ports that you want to bind.

    • Remember to open terminal as administrator

    Does anyone have an idea why this issue occured only with fastapi container?

    EDIT: What is more interesting, I checked now that it does work if we set up different port than 8000 for uvicorn server.


  2. 0

    TRY:

    Windows terminal: docker run -p 8080:8080 mountain(for me)

    https://phpout.com/wp-content/uploads/2024/03/PteGY.png

    Then

    http://localhost:8080/

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