I have a FastAPI Project that I am trying to deploy on Digital Ocean’s App Platform. I am using a base CPU instance, which is not the issue because I have tested on larger images with more RAM and CPUs.

I have a Dockerfile for my FastAPI app, that builds and runs successfully on my local machine (MacBook Pro M3 Pro), but when I attmept to deploy via Github/Dockerfile on the App Platform I keep getting two errors:

Deploy Error: Container Terminated & Deploy Error: Health Checks

There seems to be an issue when the Docker container spins up in that my project is not installed properly or referenced correctly, becuase when I want to use any modules that import components form the package itself (i.e humblapi.core.config import Config) the container seems to hang. It seems the conaitner will deploy successfully if I just have one file as my FastAPI app, but not when importing modules form the package. I have seen an error message that the humblapi package was not installed (when I wasn’t using --no-root) and also /app/src/humblapi does not contain any element.

How do I get poetry to install properly or get my container to run?

Attempts

I have tried using poetry install --no-root to avoid installing the package itself, which hasn’t worked.
I have tried changing the [tool.poetry] to include packages = [{ include = "humblapi", from = "src" },], this did not work.

I have tried doing the suggested pip install from FastAPI docs, that didn’t work.

The deployment is only successful when I do not include any humblapi imports.

Do you know if I can only use relative imports for Digital Ocean? I am confused because my local Dockerfile container runs perfectly.

The lastest attempt of trying to deploy the pip-install` branch has this error. It starts up, but then collapses and quits.

Resources

I am using docker build -t humblapi . & docker run --rm -p 8080:8080 humblapi

poetry install –no-root (runs locally)

FROM python:3.11-slim

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y 
    gcc 
    g++ 
    curl 
    pkg-config 
    libssl-dev 
    libgtk-3-dev 
    libsoup2.4-dev 
    libjavascriptcoregtk-4.0-dev 
    libwebkit2gtk-4.0-dev 
    && rm -rf /var/lib/apt/lists/*

# Install Rust
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV PATH="/root/.cargo/bin:${PATH}"

# Copy project files
COPY pyproject.toml poetry.lock* README.md /app/

# Install dependencies without pywry
RUN pip install poetry && 
    poetry config virtualenvs.create false && 
    poetry install --no-dev --no-interaction --no-ansi --no-root -v

# Install pywry separately
RUN pip install pywry==0.6.2

# Copy the rest of the application
COPY . /app

EXPOSE 8080
CMD ["fastapi", "run", "src/humblapi/main.py", "--host", "0.0.0.0", "--port", "8080"]

pip install multi-stage Dockerfile (runs locally)

# Stage 1: Generate requirements.txt
FROM python:3.11-slim as requirements-stage

WORKDIR /tmp

RUN pip install poetry

COPY pyproject.toml poetry.lock* /tmp/

RUN poetry export -f requirements.txt --output requirements.txt --without-hashes

# Stage 2: Final image
FROM python:3.11-slim

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y 
    gcc 
    g++ 
    curl 
    pkg-config 
    libssl-dev 
    libgtk-3-dev 
    libsoup2.4-dev 
    libjavascriptcoregtk-4.0-dev 
    libwebkit2gtk-4.0-dev 
    && rm -rf /var/lib/apt/lists/*

# Install Rust
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV PATH="/root/.cargo/bin:${PATH}"

# Copy requirements.txt from the previous stage
COPY --from=requirements-stage /tmp/requirements.txt /app/requirements.txt

# Install dependencies
RUN pip install --no-cache-dir -r /app/requirements.txt

# Copy the rest of the application
COPY . /app

EXPOSE 8080
CMD ["fastapi", "run", "src/humblapi/main.py", "--host", "0.0.0.0", "--port", "8080"]