Docker Claude Skill

Docker Development Skill for Claude Code

A Claude Code skill for container-based development with Docker. Ensures all package installations and code execution happen inside containers, keeping your host machine clean.

Installation

git clone https://github.com/wrsmith108/docker-claude-skill.git ~/.claude/skills/docker

Key Principle

**Never run `npm`, `node`, `npx`, `tsx`, or project scripts directly on the host machine.**

Always use `docker exec ` instead.

What's Included

• First-Time Setup Guide: Step-by-step configuration for new projects
• Native Module Compatibility: Alpine vs Slim decision guide (glibc requirements)
• Enforcement Rules: Block npm/node commands from running on host
• Pre-Flight Checks: Verify container status before commands
• Command Reference: docker exec, docker-compose patterns
• Troubleshooting: Common issues including ERR_DLOPEN_FAILED fixes
• Project Configuration: .claude/docker-config.json for per-project settings

Quick Start

1. Configure for Your Project

Create `.claude/docker-config.json`:

{
  "containerName": "my-project-dev-1",
  "baseImage": "node:20-slim",
  "port": 3000,
  "hasNativeModules": true
}

2. Choose Base Image

Your Project Has	Use
Native modules (sqlite, sharp, bcrypt)	node:20-slim
Pure JavaScript/TypeScript only	node:20-alpine
Unsure	node:20-slim (safe default)

3. Start Container

docker compose --profile dev up -d
docker exec my-project-dev-1 npm install

4. Run Commands in Container

docker exec my-project-dev-1 npm test
docker exec my-project-dev-1 npm run build
docker exec my-project-dev-1 npm run lint

Why Docker?

• Clean Host: No node_modules pollution on your machine
• Reproducible: Same environment for all developers
• Isolated: Project dependencies don't conflict
• Secure: No global pack