Docker Guide 🐳

Containerization & Deployment

1. What is Docker?

Docker is a platform that packages applications into containers so they run the same on any system.

2. Key Concepts

Image → Blueprint of app
Container → Running app
Dockerfile → Instructions to build image

3. Dockerfile Example

FROM node:18
WORKDIR /app
COPY . .
RUN npm install
CMD ["node", "app.js"]

4. Build Image

docker build -t myapp .

5. Run Container

docker run -p 3000:3000 myapp

6. Benefits

- Same environment everywhere
- Easy deployment
- Scalable apps

7. Real Use Cases