Unable to deploy dockerized FastAPI application to ECS fargate

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn’t find it.
• I searched the FastAPI documentation, with the integrated search.
• I already searched in Google “How to X in FastAPI” and didn’t find any information.
• I already read and followed all the tutorial in the docs and didn’t find an answer.
• I already checked if it is not related to FastAPI but to Pydantic.
• I already checked if it is not related to FastAPI but to Swagger UI.
• I already checked if it is not related to FastAPI but to ReDoc.

Commit to Help

• I commit to help with one of those options 👆

Example Code

Dockerfile:
# Image from dockerhub
FROM python:3.8.1-slim 

ENV PYTHONUNBUFFERED 1 
# Expose the port 8000 in which our application runs
EXPOSE 8000 
# Make /app as a working directory in the container
WORKDIR /app 
# Copy requirements from host, to docker container in /app 
COPY ./requirements.txt .
# Copy everything from ./app directory to /app in the container
COPY ./app . 
# Install the dependencies
RUN pip install --no-deps -r requirements.txt
# Run the application in the port 8000
ENTRYPOINT [ "uvicorn" ]
CMD ["--host", "0.0.0.0", "--port", "8000", "app.main:app"]

docker-compose.yml
version: '3.8'

services:
  web:
    restart: always
    build:
      context: .
      dockerfile: ./Dockerfile
    volumes:
      - .:/app
    ports:
      - 8000:8000

Description

docker-compose and docker build both work locally on Docker Desktop. However, when I deploy to ECS/fargate, I get the following error.

### Cloudwatch logs for ECS/Fargate Task

Traceback (most recent call last):

File “/usr/local/bin/uvicorn”, line 8, in <module> sys.exit(main()) File “/usr/local/lib/python3.8/site-packages/click/core.py”, line 829, in call return self.main(*args, **kwargs) File “/usr/local/lib/python3.8/site-packages/click/core.py”, line 782, in main rv = self.invoke(ctx) File “/usr/local/lib/python3.8/site-packages/click/core.py”, line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File “/usr/local/lib/python3.8/site-packages/click/core.py”, line 610, in invoke return callback(*args, **kwargs) File “/usr/local/lib/python3.8/site-packages/uvicorn/main.py”, line 362, in main run(**kwargs) File “/usr/local/lib/python3.8/site-packages/uvicorn/main.py”, line 386, in run server.run() File “/usr/local/lib/python3.8/site-packages/uvicorn/server.py”, line 49, in run loop.run_until_complete(self.serve(sockets=sockets)) File “uvloop/loop.pyx”, line 1494, in uvloop.loop.Loop.run_until_complete File “/usr/local/lib/python3.8/site-packages/uvicorn/server.py”, line 56, in serve config.load() File “/usr/local/lib/python3.8/site-packages/uvicorn/config.py”, line 308, in load self.loaded_app = import_from_string(self.app) File “/usr/local/lib/python3.8/site-packages/uvicorn/importer.py”, line 23, in import_from_string raise exc from None File “/usr/local/lib/python3.8/site-packages/uvicorn/importer.py”, line 20, in import_from_string module = importlib.import_module(module_str) File “/usr/local/lib/python3.8/importlib/init.py”, line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File “<frozen importlib._bootstrap>”, line 1014, in _gcd_import File “<frozen importlib._bootstrap>”, line 991, in _find_and_load File “<frozen importlib._bootstrap>”, line 961, in _find_and_load_unlocked File “<frozen importlib._bootstrap>”, line 219, in _call_with_frames_removed File “<frozen importlib._bootstrap>”, line 1014, in _gcd_import File “<frozen importlib._bootstrap>”, line 991, in _find_and_load File “<frozen importlib._bootstrap>”, line 973, in _find_and_load_unlocked ModuleNotFoundError: No module named ‘uvicorn app’

Operating System

Linux

Operating System Details

docker

FastAPI Version

0.65.2

Python Version

3.8.1

Additional Context

No response

[zavbala]

Hello @schrecka, were you able to deploy it? I have many issues too

[iamthen0ise]

Hi @schrecka I am confused by the error text itself:

 ModuleNotFoundError: No module named 'uvicorn app'

Is it a good practice to use entrypoint command like this? Usually I do not use ENTRYPOINTfor binary files.

ENTRYPOINT [ "uvicorn" ]
CMD ["--host", "0.0.0.0", "--port", "8000", "app.main:app"]

Would it work if you will run application as it mentioned in FastAPI docs? The example provided for RaspberryPI, but mentioned CMD command is valid for any platform.

CMD ["uvicorn", "app.main:app",  "--host", "0.0.0.0", "--port", "8000"]

Sorry if i missed something