10 months ago
I am trying to build and deploy the FastAPI backend of a monorepo I have.
The nextjs frontend built and deployed successfully, however the backend builds and then hangs in the deploy stage. The only message in the Deploy Logs is "Starting Container".
I dont know why this isnt working or how I can go about debugging.
The dockerfile I am using builds and runs locally.
7 Replies
10 months ago
Hello,
Your start command is likely incorrect - python main.py
Typically, FastAPI apps are started via uvicorn.
Best,
Brody
Status changed to Awaiting User Response Railway • 10 months ago
brody
Hello,Your start command is likely incorrect - python main.pyTypically, FastAPI apps are started via uvicorn.Best,Brody
10 months ago
Ah that sounds about right, I am defining the start commands in the Dockerfile, is that not a valid way to do it?
Status changed to Awaiting Railway Response Railway • 10 months ago
Status changed to Awaiting User Response Railway • 10 months ago
brody
It is a valid way to do it, it's just that you aren't using uvicorn.
10 months ago
I have specified the start command to be uvicorn in the dockerfile
FROM python:3.12
WORKDIR /app
COPY ./requirements.txt .
RUN pip install --no-cache-dir --upgrade -r requirements.txt
COPY . .
EXPOSE 8000
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]Status changed to Awaiting Railway Response Railway • 10 months ago
jamesheavey
I have specified the start command to be uvicorn in the dockerfileFROM python:3.12 WORKDIR /app COPY ./requirements.txt . RUN pip install --no-cache-dir --upgrade -r requirements.txt COPY . . EXPOSE 8000 CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
10 months ago
I just tried to manually override the start command and that didnt work. Also I noticed in the build logs, it appears that it ran and started the server there?
```
[stage-0 6/10] RUN --mount=type=cache,id=s/8dc4cd99-04b5-4fa0-824e-14c44f74249c-/root/cache/pip,target=/root/.cache/pip python -m venv --copies /opt/venv && . /opt/venv/bin/activate && pip install -r requirements.txt 
2m 55s
May 07 20:57:39
[stage-0 7/10] COPY . /app/.
May 07 20:57:40
[stage-0 7/10] COPY . /app/. 679ms
May 07 20:57:40
[stage-0 8/10] RUN uvicorn main:app --host 0.0.0.0 --port 8000
May 07 20:57:48
INFO: Started server process [1] INFO: Waiting for application startup.
May 07 20:58:12
Error rendering graph: [Errno 2] No such file or directory: '../assets/ingester.png'
May 07 20:58:13
Error rendering graph: [Errno 2] No such file or directory: '../assets/query_agent.png'
May 07 20:58:13
Error rendering graph: [Errno 2] No such file or directory: '../assets/visualise_agent.png'
May 07 20:58:13
Error rendering graph: [Errno 2] No such file or directory: '../assets/supervisor.png'
May 07 20:58:13
INFO: Application startup complete.
May 07 20:58:13
INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```
10 months ago
Remove your CMD directive, and set it on Railway instead.
Status changed to Awaiting User Response Railway • 10 months ago
ray-chen
Remove your CMD directive, and set it on Railway instead.https://docs.railway.com/reference/build-and-start-commands
10 months ago
Thanks guys, I managed to get it working by ditching dockerfiles altogether and manually setting the start command as you suggested
Status changed to Awaiting Railway Response Railway • 10 months ago
Status changed to Solved jamesheavey • 10 months ago