ref https://docs.docker.com/engine/reference/commandline/cli/
$docker version
to get docker information
$docker run -it hello-world
-it : keep standard in/out
to run hello-world container
$docker images
to know what image install this docker server
$docker container rm 9fc415fede9f
to delete container_id 9fc415fede9f
$docker rmi image 2cb0d9787c4d
to delete image_id 2cb0d9787c4d
