Docker Hello world
After having installed docker on your operating system (with Windows you need a Linux VM) we can try to say our first hello world typing
docker run hello-world
This will end up with a lot of interesting things to learn.
First of all on how to run a container: docker run <containername>
Then, in the output of this command we can see that, if the container is not found locally, docker client runtime will try to download the image it from his repository (docker hub). Then it will create the container starting from the downloaded image.
the second time you execute the same command it will find the container locally avoiding to download it again.