Dockerfile

# Use Python 3.11 slim image for smaller size and security
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    FLASK_ENV=production \
    FLASK_DEBUG=false

# Create non-root user for security
RUN groupadd -r appuser && useradd -r -g appuser appuser

# Set work directory
WORKDIR /app

# Install system dependencies
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        gcc \
        python3-dev \
    && rm -rf /var/lib/apt/lists/*

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

# Install Python dependencies
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# Create logs directory and set permissions
RUN mkdir -p /app/logs \
    && chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 5000

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:5000/health || exit 1

# Run with gunicorn
CMD ["gunicorn", "--config", "gunicorn.conf.py", "app:app"]