internetx-ddns-updater/Dockerfile

# Use Node.js LTS Alpine as base image
FROM node:24-alpine AS base

# Build stage
FROM base AS builder

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm ci --only=production

# Production stage
FROM base AS production

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

# Set working directory
WORKDIR /app

# Copy dependencies from builder
COPY --from=builder --chown=nodejs:nodejs /app/node_modules ./node_modules

# Copy application code
COPY --chown=nodejs:nodejs . .

# Create logs directory
RUN mkdir -p logs && chown -R nodejs:nodejs logs

# Switch to non-root user
USER nodejs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD node -e "require('http').get('http://localhost:3000/health', (r) => {r.statusCode === 200 ? process.exit(0) : process.exit(1)})"

# Start application
CMD ["node", "src/index.js"]