Getting Started with Docker

Docker · Reference cheat sheet

📋 Overview

Docker packages apps and dependencies into images and runs them as containers. Use it for reproducible environments, local stacks, and deployment units.

🔧 Core concepts

💡 Examples

Run nginx:

docker run --rm -p 8080:80 nginx:alpine

Build and run:

docker build -t myapp:dev .
docker run --rm -p 9000:9000 myapp:dev

Shell into a container:

docker exec -it <container> sh

⚠️ Pitfalls

• Binding only to container localhost is fine; publishing ports needs -p host:container.
• Data in the writable container layer is lost when the container is removed — use volumes.
• Running as root inside images increases risk — prefer non-root users in production images.

🔗 Related

• dockerfile.md
• compose.md
• images_tags.md
• glossary.md