sudo apt update

Step 3:

Install prerequisite packages which let apt use packages over HTTPS:

sudo apt install apt-transport-https ca-certificates curl software-properties-common

Step 4:

Add GPG key for the official Docker repository to your system:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Step 5:
Add the Docker repository to APT sources:

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bioni

Step 6:

Update the package database 

sudo apt update

Step 7:

Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:

apt-cache policy docker-ce

You’ll see output like this, although the version number for Docker may be different:

Notice that docker-ce is not installed

Step 8:

Finally, install Docker:

sudo apt install docker-ce

Step 9:

Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running:

sudo systemctl status docker

Installing Docker now gives you not just the Docker service (daemon) but also the docker command line utility,


Step 10:

To view system-wide information about Docker, use:

docker info

sudo docker info

To check whether you can access and download images from Docker Hub, type:


Step 11:

sudo docker run hello-world

To see the images that have been downloaded to your computer, type:

sudo docker images

The output should look similar to the following:


The hello-world container you ran in the previous step is an example of a container that runs and exits after emitting a test message. Containers can be much more useful than that, and they can be interactive.

After using Docker for a while, you’ll have many active (running) and inactive containers on your computer. To view the active ones, use:

sudo docker ps

check latest one

sudo docker ps -l

  

To view all containers — active and inactive, run docker ps with the -a switch:

sudo docker ps -a

Thats all in terms of installing Docker and some basic commands.