I have a simple FastAPI project called toyrest that runs a trivial API. The code looks like this.
from fastapi import FastAPI
__version__ = "1.0.0"
app = FastAPI()
@app.get("/")
def root():
return "hello"
I’ve built the usual Python package infrastructure around it. I can install the package. If I run uvicorn toyrest:app the server launches on port 8000 and everything works.
Now I’m trying to get this to run in a Docker image. I have the following Dockerfile.
# syntax=docker/dockerfile:1
FROM python:3
# Create a user.
RUN useradd --user-group --system --create-home --no-log-init user
USER user
ENV PATH=/home/user/.local/bin:$PATH
# Install the API.
WORKDIR /home/user
COPY --chown=user:user . ./toyrest
RUN python -m pip install --upgrade pip && \
pip install -r toyrest/requirements.txt
RUN pip install toyrest/ && \
rm -rf /home/user/toyrest
CMD ["uvicorn", "toyrest:app"]
I build the Docker image and run it, forwarding port 8000 to the running container.
docker run -p 8000:8000 toyrest:1.0.0
INFO: Started server process [1]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
When I try to connect to http://127.0.0.1:8000/ I get no response.
Presumably I am doing the port forwarding incorrectly. I’ve tried various permutations of the port forwarding argument (e.g. -p 8000, -p 127.0.0.1:8000:8000) to no avail.
This is such a basic Docker command that I can’t see how I’m getting it wrong, but somehow I am. What am I doing wrong?
>Solution :
try to add this line to yourCMD in ̀dockerfile`:
CMD ["uvicorn", "toyrest:app","--host", "0.0.0.0"]