Install docker on Ubuntu

Step :1  

Open terminal using command Ctrl+T.

Step 2:

Update your existing list of packages.

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 | sudo apt-key add -

Step 5:
Add the Docker repository to APT sources:

sudo add-apt-repository "deb [arch=amd64] 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

This will give you permission error so try with sudo you can check more on how to avoid using sudo everytime

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.

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