Docker How-To

Install & Verify

• Install from docker.com.
• Check version: docker --version.

Working with Images

• Pull image: docker pull nginx:1.25
• List images: docker images
• Build image: docker build -t myapp:1.0 .
• Tag image: docker tag myapp:1.0 myrepo/myapp:1.0
• Push image: docker push myrepo/myapp:1.0

Working with Containers

• Run container: docker run -d --name web -p 8080:80 nginx
• List running containers: docker ps
• Start/stop container: docker start web / docker stop web
• Exec into container: docker exec -it web /bin/sh
• View logs: docker logs -f web

Volumes & Networks

• Create volume: docker volume create data
• Run with volume: docker run -v data:/app/data ...
• Create network: docker network create mynet
• Run with network: docker run --network=mynet ...

Dockerfile Basics

FROM ubuntu:20.04
RUN apt-get update && apt-get install -y curl
COPY app/ /app
WORKDIR /app
CMD ["./start.sh"]