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backend-node/Dockerfile

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+# ========================================
+# Multi-stage Dockerfile for Backend Node.js
+# ========================================
+
+# ========================================
+# Stage 1: Base
+# ========================================
+FROM node:20-alpine AS base
+
+# Install dumb-init for proper signal handling
+RUN apk add --no-cache dumb-init
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files for dependency installation
+COPY package*.json ./
+
+# ========================================
+# Stage 2: Dependencies
+# ========================================
+FROM base AS dependencies
+
+# Install ALL dependencies (including devDependencies for build)
+RUN npm ci
+
+# ========================================
+# Stage 3: Development
+# ========================================
+FROM dependencies AS development
+
+# Set NODE_ENV
+ENV NODE_ENV=development
+
+# Copy application code
+COPY . .
+
+# Expose port
+EXPOSE 3000
+
+# Use dumb-init to handle signals properly
+ENTRYPOINT ["dumb-init", "--"]
+
+# Start with nodemon for hot reload
+CMD ["npm", "start"]
+
+# ========================================
+# Stage 4: Production Dependencies
+# ========================================
+FROM base AS production-dependencies
+
+# Install only production dependencies
+RUN npm ci --only=production && \
+    npm cache clean --force
+
+# ========================================
+# Stage 5: Production Build
+# ========================================
+FROM base AS production
+
+# Set NODE_ENV
+ENV NODE_ENV=production
+
+# Copy production dependencies
+COPY --from=production-dependencies /app/node_modules ./node_modules
+
+# Copy application code
+COPY . .
+
+# Create non-root user for security
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S nodejs -u 1001 && \
+    chown -R nodejs:nodejs /app
+
+# Switch to non-root user
+USER nodejs
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+    CMD node -e "require('http').get('http://localhost:3000/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Use dumb-init to handle signals properly
+ENTRYPOINT ["dumb-init", "--"]
+
+# Start the application
+CMD ["node", "server.js"]