Dockerfile

# 🐳 Production Dockerfile for AD Microservice with Kerberos
# Multi-stage build for optimal size and security

# Stage 1: Build stage
FROM python:3.10-slim as builder

# Install build dependencies
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    libkrb5-dev \
    libffi-dev \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

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

# Stage 2: Runtime stage
FROM python:3.10-slim

# Install runtime dependencies for Kerberos
RUN apt-get update && apt-get install -y \
    krb5-user \
    libkrb5-3 \
    libgssapi-krb5-2 \
    curl \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

# Copy virtual environment from builder stage
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Create non-root user
RUN groupadd -r appuser && useradd -r -g appuser -u 1000 appuser

# Create directories with proper ownership
RUN mkdir -p /app /etc/krb5 /tmp && \
    chown -R appuser:appuser /app /tmp && \
    chmod 755 /etc/krb5

# Copy application code
COPY --chown=appuser:appuser . /app
WORKDIR /app

# Create necessary directories for the application
RUN mkdir -p /app/logs && \
    chown appuser:appuser /app/logs

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Environment variables
ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1
ENV PYTHONDONTWRITEBYTECODE=1

# Command to run the application
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]