MCPInstall

docker-deployment

Containerize and deploy Node.js applications with Docker including multi-stage builds, Docker Compose, and production optimization

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill docker-deployment
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads docker-deployment automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Docker Deployment Skill

Master containerizing and deploying Node.js applications with Docker for consistent, portable deployments.

Quick Start

Dockerize Node.js app in 3 steps:

  1. Create Dockerfile - Define container image
  2. Build Image - docker build -t myapp .
  3. Run Container - docker run -p 3000:3000 myapp

Core Concepts

Basic Dockerfile

FROM node:18-alpine

WORKDIR /app

COPY package*.json ./
RUN npm ci --only=production

COPY . .

EXPOSE 3000

CMD ["node", "src/index.js"]

Multi-Stage Build (Optimized)

# Build stage
FROM node:18-alpine AS builder

WORKDIR /app

COPY package*.json ./
RUN npm ci --only=production

COPY . .

# Production stage
FROM node:18-alpine

WORKDIR /app

# Copy from builder
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app .

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

USER nodejs

EXPOSE 3000

HEALTHCHECK --interval=30s --timeout=3s \
  CMD node healthcheck.js || exit 1

CMD ["node", "src/index.js"]

Learning Path

Beginner (1-2 weeks)

  • ✅ Understand Docker basics
  • ✅ Create simple Dockerfile
  • ✅ Build and run containers
  • ✅ Manage volumes and networks

Intermediate (3-4 weeks)

  • ✅ Multi-stage builds
  • ✅ Docker Compose
  • ✅ Environment variables
  • ✅ Health checks

Advanced (5-6 weeks)

  • ✅ Image optimization
  • ✅ Production best practices
  • ✅ Container orchestration
  • ✅ CI/CD integration

Docker Compose

# docker-compose.yml
version: '3.8'

services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production
      - DATABASE_URL=postgresql://db:5432/myapp
      - REDIS_URL=redis://redis:6379
    depends_on:
      - db
      - redis
    restart: unless-stopped

  db:
    image: postgres:15-alpine
    environment:
      - POSTGRES_USER=myapp
      - POSTGRES_PASSWORD=secret
      - POSTGRES_DB=myapp
    volumes:
      - postgres-data:/var/lib/postgresql/data

  redis:
    image: redis:7-alpine
    volumes:
      - redis-data:/data

  nginx:
    image: nginx:alpine
    ports:
      - "80:80"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
    depends_on:
      - app

volumes:
  postgres-data:
  redis-data:

Docker Compose Commands

# Start services
docker-compose up -d

# View logs
docker-compose logs -f app

# Stop services
docker-compose down

# Rebuild images
docker-compose up -d --build

# Scale services
docker-compose up -d --scale app=3

.dockerignore

node_modules
npm-debug.log
.git
.gitignore
.env
.env.local
.vscode
*.md
tests
coverage
.github
Dockerfile
docker-compose.yml

Docker Commands

# 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

# Enter container
docker exec -it myapp sh

# Stop container
docker stop myapp

# Remove container
docker rm myapp

# List images
docker images

# Remove image
docker rmi myapp:latest

# Prune unused resources
docker system prune -a

Environment Variables

# In Dockerfile
ENV NODE_ENV=production
ENV PORT=3000

# Or in docker-compose.yml
environment:
  - NODE_ENV=production
  - PORT=3000

# Or from .env file
env_file:
  - .env.production

Volumes for Persistence

services:
  app:
    volumes:
      - ./logs:/app/logs              # Bind mount
      - node_modules:/app/node_modules # Named volume

volumes:
  node_modules:

Health Checks

# In Dockerfile
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s \
  CMD node healthcheck.js || exit 1
// healthcheck.js
const http = require('http');

const options = {
  host: 'localhost',
  port: 3000,
  path: '/health',
  timeout: 2000
};

const request = http.request(options, (res) => {
  console.log(`STATUS: ${res.statusCode}`);
  process.exit(res.statusCode === 200 ? 0 : 1);
});

request.on('error', (err) => {
  console.log('ERROR:', err);
  process.exit(1);
});

request.end();

Image Optimization

# Use Alpine (smaller base image)
FROM node:18-alpine  # 180MB vs node:18 (1GB)

# Multi-stage build (remove build dependencies)
# Use .dockerignore (exclude unnecessary files)
# npm ci instead of npm install (faster, deterministic)
# Only production dependencies
RUN npm ci --only=production

# Combine RUN commands (fewer layers)
RUN apk add --no-cache git && \
    npm ci && \
    apk del git

Production Best Practices

FROM node:18-alpine

# Don't run as root
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001

WORKDIR /app

COPY --chown=nodejs:nodejs package*.json ./
RUN npm ci --only=production

COPY --chown=nodejs:nodejs . .

USER nodejs

# Health check
HEALTHCHECK CMD node healthcheck.js || exit 1

# Use node instead of npm start (better signal handling)
CMD ["node", "src/index.js"]

Docker Hub Deployment

# Login
docker login

# Tag image
docker tag myapp:latest username/myapp:1.0.0
docker tag myapp:latest username/myapp:latest

# Push to Docker Hub
docker push username/myapp:1.0.0
docker push username/myapp:latest

# Pull from Docker Hub
docker pull username/myapp:latest

CI/CD with GitHub Actions

name: Docker Build & Deploy

on:
  push:
    branches: [main]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3

      - uses: docker/setup-buildx-action@v2

      - uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - uses: docker/build-push-action@v4
        with:
          push: true
          tags: username/myapp:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

Common Issues & Solutions

Node modules caching

# Cache node_modules layer
COPY package*.json ./
RUN npm ci
COPY . .  # This doesn't rebuild node_modules

Signal handling

# Use node directly (not npm)
CMD ["node", "src/index.js"]

# In app: Handle SIGTERM
process.on('SIGTERM', () => {
  server.close(() => process.exit(0));
});

When to Use

Use Docker deployment when:

  • Need consistent environments (dev, staging, prod)
  • Deploying microservices
  • Want easy scaling and orchestration
  • Using cloud platforms (AWS, GCP, Azure)
  • Implementing CI/CD pipelines

Related Skills

  • Express REST API (containerize APIs)
  • Database Integration (multi-container setup)
  • Testing & Debugging (test in containers)
  • Performance Optimization (optimize images)

Resources

FAQ

What does the docker-deployment skill do?

Containerize and deploy Node.js applications with Docker including multi-stage builds, Docker Compose, and production optimization

How do I install docker-deployment?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-nodejs --skill docker-deployment in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/docker-deployment/ (personal) or .claude/skills/docker-deployment/ (project).

Which AI agents can use docker-deployment?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is docker-deployment safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains docker-deployment?

It is published by pluginagentmarketplace in pluginagentmarketplace/custom-plugin-nodejs. It has 523 recorded installs.

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