What is Docker?
Package Software into Standardized Units for Development, Shipment, and Deployment
Get started with basic Docker commands:
1. Build an image from the docker file
 docker build [OPTIONS] PATH | URL | –
2. Images: Once the build is done the image can be viewed by the command as follows
  docker images
3. Docker run
$ docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG...]For example docker run hello-world
docker run redis
4. List the docker processes that are running currently.
docker ps
To list all the docker images in the machine:
docker ps -a
To stop running all containers
docker ps -aq
To remove containers
docker rmi 