Dockerfile

FROM python:3.11-slim-bookworm

# Set working directory
WORKDIR /app

# Install system dependencies and security updates
RUN apt-get update \
    && apt-get dist-upgrade -y \
    && apt-get install -y --no-install-recommends \
        gcc \
        g++ \
        curl \
        libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better caching
COPY requirements.txt .

# Install Python dependencies and clean up in one layer
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt \
    && apt-get purge -y --auto-remove gcc g++ \
    && rm -rf /var/lib/apt/lists/* \
    && find /usr/local -type d -name __pycache__ -exec rm -rf {} + \
    && find /usr/local -type f -name "*.pyc" -delete

# Copy application code
COPY . .

# Create non-root user and set permissions
RUN useradd -m -u 1000 appuser \
    && chown -R appuser:appuser /app
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Set environment variables
ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1
ENV PYTHONDONTWRITEBYTECODE=1

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