Docker: 5세 어린이에게 설명했습니다. 👶🏻

Docker is a way to containerize applications (putting code in boxes that can work on their own). It magically makes a virtual computer, but guess what - they aren't really virtual computers.

Containers are boxes that have no host Operating system, so they are independent of the device they run on.

Think of it like this - there's a bee that only likes to live in it's own honeycomb, and will not be able to work if it lives somewhere else. You just trap the bee in a box that looks and feels exactly like it's honeycomb. That's containerization.

Containers are made using Images

Docker Images are like templates - a craftbook that has everything to make the craft. Or, in other words, it contains a set of instructions for creating a container.

But how do you make these images (to later make containers) ?

This is done using Dockerfiles.

A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.
Ok, let's make a Dockerfile together.

Now, we'll start with docker HANDS ON!

Now, build to docker image using the docker build command and then run the image by using the docker run . command.

You can also use the --tag to give a name to the image and make it easier for yourself to run later

docker build --tag flask .
docker run --name flask -p 5000:5000 flask

Here, --name is the name of the container to be run (which i'm naming flask), -p sets the port of the docker CONTAINER to your machine, so you can see your app on localhost . Finally, the flask at the name is the name of the image to be run.

That's pretty much it!!!
use the "docker ps" command to get a list of running containers,
"docker ps -a" to get list of ALL containers
"docker images" to get list of images

"docker --help" to get list of all commands

Mess around with the commands, they are self-explanatory