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devcontainers

Define reproducible development environments with Dev Containers. Use when a user asks to standardize dev environments, set up VS Code remote containers, create reproducible dev setups, or onboard developers faster.

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TerminalSkills/skills
연동 도구DockerPostgreSQL
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SKILL.md(원문)

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Dev Containers

Overview

Dev Containers define reproducible development environments in Docker. Open a repo in VS Code or GitHub Codespaces and get the exact same environment — tools, extensions, settings pre-installed.

Instructions

Step 1: Basic Config

// .devcontainer/devcontainer.json — Dev environment definition
{
  "name": "My Project",
  "image": "mcr.microsoft.com/devcontainers/typescript-node:20",
  "features": {
    "ghcr.io/devcontainers/features/docker-in-docker:4": {},
    "ghcr.io/devcontainers/features/github-cli:1": {}
  },
  "forwardPorts": [3000, 5432],
  "postCreateCommand": "npm install",
  "customizations": {
    "vscode": {
      "extensions": [
        "dbaeumer.vscode-eslint",
        "esbenp.prettier-vscode"
      ],
      "settings": { "editor.formatOnSave": true }
    }
  }
}

Step 2: With Database

# .devcontainer/docker-compose.yml
services:
  app:
    image: mcr.microsoft.com/devcontainers/typescript-node:20
    volumes: [../:/workspace:cached]
    command: sleep infinity
  db:
    image: postgres:16
    environment:
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: myapp
    volumes: [pgdata:/var/lib/postgresql/data]
volumes:
  pgdata:

Examples

Example 1: "Our new hires spend a day installing the right Node version, Postgres, and CLI tools before they can run the app"

Add a .devcontainer/devcontainer.json at the repo root using the config in Step 1 above, committing it to version control. A new hire clones the repo, opens it in VS Code, clicks "Reopen in Container" when prompted (or runs the "Dev Containers: Reopen in Container" command), and VS Code builds the image, runs postCreateCommand (npm install), and attaches with the listed extensions already installed. No local Node, Postgres, or CLI setup is needed on the host machine.

You can also build and run the same definition from the command line (CI, or without VS Code) using the standalone CLI:

npm install -g @devcontainers/cli
devcontainer up --workspace-folder .
devcontainer exec --workspace-folder . npm test

Example 2: "Our app needs Postgres running alongside it for local development, not just the app container"

Use the Docker Compose variant in Step 2: a .devcontainer/docker-compose.yml with an app service (the dev container, kept alive with command: sleep infinity so VS Code can attach) and a db service (postgres:16) sharing a Docker network, plus a .devcontainer/devcontainer.json that points dockerComposeFile at it and sets service: "app" and workspaceFolder: "/workspace". Opening the folder in VS Code starts both containers; the app connects to Postgres at host db, port 5432.

Guidelines

  • New developer: clone → open in VS Code → "Reopen in Container" → ready.
  • Features marketplace (ghcr.io/devcontainers/features/*) adds tools without custom Dockerfiles; pin a major version (e.g. :4) rather than :latest so builds stay reproducible.
  • Works with GitHub Codespaces — same config, cloud-hosted; also supported by JetBrains IDEs and the standalone devcontainer CLI (@devcontainers/cli), not just VS Code.
  • postCreateCommand runs once after the container is created; use postStartCommand for logic that should run every time the container starts (e.g. after a rebuild or restart).
  • Keep the image/Dockerfile layer caching-friendly — install dependencies before copying source so rebuilds stay fast.

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