Modern Full-Stack Development

 Your First Container: “Hello, World!” of Course!
Okay, so, Docker is installed and ready to go, what can we do with it? As is customary 
when talking about seemingly anything in programming, we’ll start by spinning up a 
“Hello, World!” container. As luck would have it, Docker Hub, the central and public 
image repository run by Docker, has just such an image available! We can pull the 
image down to our local machine and use it to create a container all with one, simple 
command:
docker run hello-world
Go ahead and execute that, and after a couple of seconds, you should see something 
like Figure 
12-2
 greet you.
Figure 12-2.  The Docker hello-world, up and running!
Chapter 12   Bringing the Dev Ship into harBor: DoCker

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As I said, this did a couple of things for you automatically, and in fact, part of what it 
did was to output, well, precisely what it did! That’s helpful, isn’t it?
Now, if you execute that command again, you’ll find that it’s even faster this time, 
and that’s because the image has already been downloaded from Docker Hub and is 
stored on your system, so that step can be skipped. Instead, Docker spins up a new 
container virtually instantly.
In short, the docker run command is how you start new containers.