Dockerfile

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

# Set working directory
WORKDIR /app

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

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

# Final stage
FROM python:3.11-slim

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

# Set working directory
WORKDIR /app

# Copy dependencies from builder stage
COPY --from=builder /root/.local /home/appuser/.local

# Copy application code
COPY app/ ./app/

# Change ownership to non-root user
RUN chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Update PATH for user-installed packages
ENV PATH=/home/appuser/.local/bin:$PATH

# Set environment variables
ENV PYTHONUNBUFFERED=1
ENV ENVIRONMENT=production
ENV PORT=5000

# Expose port
EXPOSE 5000

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

# Run with gunicorn for production
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "2", "app.app:app"]