Dockerfile

# Use official Node.js LTS image
FROM node:18-alpine

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm ci --only=production

# Copy source code
COPY . .

# Create non-root user for security
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodeuser -u 1001 -G nodejs

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

# Switch to non-root user
USER nodeuser

# Expose port (default Express port)
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD node -e "import('http').then(http => { const req = http.request({hostname: 'localhost', port: 3000, path: '/health', method: 'GET'}, res => process.exit(res.statusCode === 200 ? 0 : 1)); req.on('error', () => process.exit(1)); req.end(); })" || exit 1

# Start the application
CMD ["npm", "start"]