The executable 
uvicorn
could not be found.
58facettes
PROOP

3 months ago

Getting error "The executable uvicorn could not be found." when container tries to start the whole day!

Last version of Dockerfile:

FROM python:3.13-slim

WORKDIR /app

# Set UV_LINK_MODE to 'copy' as cache mounts are on a different filesystem
ENV UV_LINK_MODE=copy

# Install git, openssh-client, and PostgreSQL development libraries
RUN apt-get update && apt-get install -y --no-install-recommends \
    git \
    openssh-client \
    build-essential \
    libpq-dev \
    postgresql-client \
    && rm -rf /var/lib/apt/lists/*

# Install uv
COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
# Accept SSH private key as build argument
ARG SSH_PRIVATE_KEY

# Set up SSH for private repository access
RUN if [ -n "$SSH_PRIVATE_KEY" ]; then \
    mkdir -p ~/.ssh && \
    echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa && \
    chmod 600 ~/.ssh/id_rsa && \
    ssh-keyscan github.com >> ~/.ssh/known_hosts && \
    git config --global url."ssh://git@github.com/".insteadOf "https://github.com/"; \
    fi

# Copy dependency files
COPY pyproject.toml uv.lock ./

# Install dependencies
RUN --mount=type=cache,id=s/72b18e17-65d2-4255-9573-9ce8c11cf24c-/root/.cache/uv,target=/root/.cache/uv \
    uv sync --frozen --no-dev
# Clean up SSH key after installation (optional, for security)
RUN if [ -n "$SSH_PRIVATE_KEY" ]; then \
    rm -f ~/.ssh/id_rsa; \
    fi

# Copy application code
COPY app/ ./app/

# Expose port
EXPOSE 8000

# Run the application using uv run (which uses the virtual environment)
#CMD ["uv", "run", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--log-level", "info"]
CMD [".venv/bin/python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--log-level", "info"]

It runs locally without a problem, but not at Railway

Logs: https://railway.com/project/e2ee0018-fea9-49e4-a014-3c2a8fe61491/service/72b18e17-65d2-4255-9573-9ce8c11cf24c?environmentId=f2cda1da-2248-4808-bf0e-1245e632803f&id=7769928e-a4f3-4ef3-94fa-880385d218c0#build

Solved

2 Replies

Railway
BOT

3 months ago

Hey there! We've found the following might help you get unblocked faster:

If you find the answer from one of these, please let us know by solving the thread!

58facettes
PROOP

3 months ago

Fixed with:
```
FROM python:3.13-slim WORKDIR /app # Set UV_LINK_MODE to 'copy' as cache mounts are on a different filesystem ENV UV_LINK_MODE=copy # Install git, openssh-client, and PostgreSQL development libraries RUN apt-get update && apt-get install -y --no-install-recommends \ git \ openssh-client \ build-essential \ libpq-dev \ postgresql-client \ && rm -rf /var/lib/apt/lists/* # Install uv COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv # Accept SSH private key as build argument ARG SSH_PRIVATE_KEY # Set up SSH for private repository access RUN if [ -n "$SSH_PRIVATE_KEY" ]; then \ mkdir -p ~/.ssh && \ echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa && \ chmod 600 ~/.ssh/id_rsa && \ ssh-keyscan github.com >> ~/.ssh/known_hosts && \ git config --global url."ssh://git@github.com/".insteadOf "https://github.com/"; \ fi # Copy dependency files COPY pyproject.toml uv.lock ./ # Create virtual environment and install dependencies RUN --mount=type=cache,id=s/72b18e17-65d2-4255-9573-9ce8c11cf24c-/root/.cache/uv,target=/root/.cache/uv \ uv venv .venv && \ uv sync --frozen --no-dev # Clean up SSH key after installation (optional, for security) RUN if [ -n "$SSH_PRIVATE_KEY" ]; then \ rm -f ~/.ssh/id_rsa; \ fi # Copy application code COPY app/ ./app/ # Expose port EXPOSE 8000 # Add venv to PATH and run the application ENV PATH="/app/.venv/bin:$PATH" CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--log-level", "info"]
```

Status changed to Solved 58facettes • 3 months ago

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