What is Docker

Docker packages your app with everything it needs (runtime, libraries, config) into a container. The container runs the same way on your laptop, a teammate's machine, or a server. It solves the "works on my machine" problem.

docker --version
docker run hello-world          # run a test container

docker run -p 8080:80 nginx     # run a web server
# open http://localhost:8080

docker ps                       # running containers
docker stop <container-id>