docker-containers

spjoshis's avatarfrom spjoshis

Master Docker with containers, images, multi-stage builds, Docker Compose, networking, and production-ready containerization.

⭐1stars🔀0forks📁View on GitHub🕐Updated Dec 30, 2025
[Cloud Infrastructure]

When & Why to Use This Skill

This Claude skill empowers developers and DevOps engineers to master Docker containerization and orchestration. It provides comprehensive guidance on creating efficient multi-stage Dockerfiles, managing complex multi-container applications with Docker Compose, and implementing production-grade security and performance best practices. By standardizing the containerization workflow, it ensures consistent environments across development, testing, and production, significantly reducing deployment friction.

Use Cases

  • Optimizing Docker Images: Implementing multi-stage builds to significantly reduce image size, minimize attack surfaces, and improve deployment speed.
  • Local Development Orchestration: Using Docker Compose to spin up full-stack environments including databases, caches, and application servers with a single command to ensure 'it works on my machine'.
  • Production Readiness: Applying security best practices such as non-root user execution, alpine base images, and health checks for robust and secure cloud deployments.
  • CI/CD Pipeline Integration: Standardizing build and test environments to ensure consistent behavior across automated pipelines and various cloud infrastructure providers.
namedocker-containers
descriptionMaster Docker with containers, images, multi-stage builds, Docker Compose, networking, and production-ready containerization.

Docker Containerization

Build and deploy applications with Docker containers, multi-stage builds, and production-ready configurations.

Core Patterns

Dockerfile

# Multi-stage build
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

FROM node:20-alpine
WORKDIR /app
COPY --from=builder /app/dist ./dist
COPY package*.json ./
RUN npm ci --production
EXPOSE 3000
CMD ["node", "dist/index.js"]

Docker Compose

version: '3.8'

services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=postgres://user:pass@db:5432/myapp
    depends_on:
      - db
      - redis

  db:
    image: postgres:16-alpine
    environment:
      - POSTGRES_USER=user
      - POSTGRES_PASSWORD=pass
      - POSTGRES_DB=myapp
    volumes:
      - postgres_data:/var/lib/postgresql/data

  redis:
    image: redis:7-alpine
    ports:
      - "6379:6379"

volumes:
  postgres_data:

Build and Run

# Build image
docker build -t myapp:latest .

# Run container
docker run -d -p 3000:3000 --name myapp myapp:latest

# View logs
docker logs -f myapp

# Execute command in container
docker exec -it myapp sh

Best Practices

  1. Use multi-stage builds
  2. Minimize layer count
  3. Use .dockerignore
  4. Run as non-root user
  5. Use alpine images
  6. Implement health checks
  7. Use Docker secrets
  8. Tag images properly

Resources