Docker expert

Skill AtulPurohit/Antigravity-Awesome-Skills/skills/docker-expert

Build optimized, secure Docker images with multi-stage builds. Configure Docker Compose for full development and production stacks.From its SKILL.md

Install

npx -y skills add AtulPurohit/Antigravity-Awesome-Skills --skill docker-expert

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

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SKILL.md

2.5 KB, 583 tokens by cl100k_base, as published. Nobody here has run it

Docker Expert

Purpose

Create production-ready Docker images and container orchestration setups that are secure, minimal, and efficient.

Optimized Multi-Stage Dockerfile

# Node.js production example
FROM node:20-alpine AS base
WORKDIR /app
COPY package*.json ./

FROM base AS deps
RUN npm ci --only=production && npm cache clean --force

FROM base AS builder
RUN npm ci
COPY . .
RUN npm run build

FROM node:20-alpine AS production
WORKDIR /app

# Security: non-root user
RUN addgroup -S app && adduser -S appuser -G app
USER appuser

COPY --from=deps --chown=appuser:app /app/node_modules ./node_modules
COPY --from=builder --chown=appuser:app /app/dist ./dist
COPY --chown=appuser:app package.json .

EXPOSE 3000
HEALTHCHECK --interval=30s --timeout=10s   CMD wget -qO- http://localhost:3000/health || exit 1

CMD ["node", "dist/server.js"]

Docker Compose (Production)

services:
  app:
    build: { context: ., target: production }
    environment:
      DATABASE_URL: postgresql://app:${DB_PASSWORD}@db:5432/myapp
    depends_on:
      db: { condition: service_healthy }
    restart: unless-stopped

  db:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: app
      POSTGRES_PASSWORD: ${DB_PASSWORD}
      POSTGRES_DB: myapp
    volumes:
      - postgres_data:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U app"]
      interval: 10s

  nginx:
    image: nginx:alpine
    ports: ["80:80", "443:443"]
    volumes:
      - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
    depends_on: [app]

volumes:
  postgres_data:

.dockerignore

node_modules
.git
.env*
*.md
coverage
.nyc_output
dist

Security Best Practices

Pin image versions: node:20.11.0-alpine not node:alpine
Scan: docker scout cves my-image
Run as non-root
Use secrets mount for sensitive build args
Minimize layers in production image

Outputs

Optimized Dockerfile for your stack
Docker Compose configuration
.dockerignore template
Security scanning setup
Production health check configuration

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.

Gives 3 of the 12 instructions most containers cloud skills give in 583 tokens

Counted across 607 of the 657 authors here whose files we hold, read 2026-08-07

Run containers as a non-root userhere, and in 66 of 607, across 46 files
Use multi-stage buildshere, and in 53 of 607, across 44 files
Use Promise.all for independent operationsin 47 of 607, across 13 files
Import directly instead of barrel filesin 46 of 607, across 12 files
Use ternary instead of AND for conditionalsin 45 of 607, across 12 files
Use Set or Map for O(1) lookupsin 42 of 607, across 10 files
Create a .dockerignore filehere, and in 41 of 607, across 31 files
Read individual rule files for detailsin 39 of 607, across 9 files
Copy dependency files before source codein 36 of 607, across 23 files
Authenticate server actions like API routesin 35 of 607, across 7 files
Use next/dynamic for heavy componentsin 34 of 607, across 9 files
Use React.cache for per-request deduplicationin 34 of 607, across 10 files

Said here and by no other author read

Mount secrets for sensitive build arguments

Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once. Length counted with cl100k_base; the agent that loads this file may tokenize it differently.