docker-devopslisted

# Docker & DevOps Skill ## Multi-Stage Dockerfile (Node.js) ```dockerfile # Stage 1: Dependencies FROM node:20-alpine AS deps WORKDIR /app COPY package*.json ./ RUN npm ci --only=production && npm cache clean --force # Stage 2: Builder FROM node:20-alpine AS builder WORKDIR /app COPY package*.json ./ RUN npm ci COPY . . RUN npm run build # Stage 3: Production FROM node:20-alpine AS production WORKDIR /app # Security: non-root user RUN addgroup -g 1001 -S nodejs && adduser -S nodejs -u 1001 COPY --from=deps --chown=nodejs:nodejs /app/node_modules ./node_modules COPY --from=builder --chown=nodejs:nodejs /app/dist ./dist COPY --from=builder --chown=nodejs:nodejs /app/package.json ./ USER nodejs EXPOSE 3000 HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \ CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1 CMD ["node", "dist/main.js"] ``` ## Docker Compose ```yaml version: '3.8' services: app: build: context: . target: production ports: - "3000:3000" environment: - NODE_ENV=production - DATABASE_URL=postgresql://user:pass@db:5432/app depends_on: db: condition: service_healthy restart: unless-stopped db: image: postgres:16-alpine volumes: - postgres_data:/var/lib/postgresql/data environment: POSTGRES_USER: user POSTGRES_PASSWORD: pass POSTGRES_DB: app healthcheck: test: ["CMD-SHELL", "pg_isready -U user