Modern Full-Stack Development

 Remove Containers and Images
You’ll probably want to clean up those containers at some point, and there’s a command 
for that:
docker rm
If the container is running, Docker won’t let you remove it until you stop it.
Likewise, you can remove images:
docker rmi
As with containers, Docker won’t allow you to delete an image that’s used by a 
container, regardless of whether it’s running or not, so you’ll need to clean up the 
containers first.
 Pulling  Images
What if you want to download some images but not immediately start containers based 
on them? That’s easy enough:
docker pull hello-world
Now, the image will be downloaded if it’s not already on your system (if it is, docker 
will try to update it if the latest version is newer than what’s on your system). After that, 
you can do a docker run to spin up containers like before.
You can push images to a repository as well, but we’ll get to that later.