Dockerfile

# Multi-stage Dockerfile for production deployment

# Stage 1: Build stage
FROM python:3.11-slim as builder

# Set working directory
WORKDIR /build

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements
COPY requirements.txt .

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


# Stage 2: Runtime stage
FROM python:3.11-slim

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PATH=/root/.local/bin:$PATH

# Create app user (security best practice)
RUN useradd -m -u 1000 appuser

# Set working directory
WORKDIR /app

# Copy installed packages from builder
COPY --from=builder /root/.local /root/.local

# Copy application code
COPY ./app ./app
COPY env.example .env

# Create directories for model storage and logs
RUN mkdir -p /app/model_storage /app/logs && \
    chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8000/api/v1/health')"

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