Dockerfile

# Multi-stage build for slim image
FROM python:3.11-slim as builder

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements and install
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt


# Final stage
FROM python:3.11-slim

WORKDIR /app

# Create non-root user for security
RUN useradd -m -u 1000 appuser

# Copy installed packages from builder
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Copy application
COPY app.py .

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 5000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python3 -c "import urllib.request; urllib.request.urlopen('http://localhost:5000/health')" || exit 1

# Run with gunicorn
CMD ["gunicorn", "--workers", "2", "--worker-class", "sync", "--timeout", "30", "--bind", "0.0.0.0:5000", "app:app"]