Installing Docker on your Shell with Ubuntu 20.04

Docker is a virtualization application that allows you to work with containers. Containers are like virtual machines and allow applications to run in their own isolated environment that runs on top of Docker. This allows you to run open source applications in a sandbox environment. You can think of docker as a hypervisor and the applications like a VM instance. In this tutorial, we will cover installation and do a brief introduction on how to run a docker container. Let's get started!

Installation

First, let's open up a terminal session by selecting    and search for the terminal in the search bar and click to open.

Now, let's make sure our system repositories are up to date.

sudo apt update

Next, we will need to download a few dependencies needed for docker.

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

Adding gpg key

Adding the gpg key will make sure that the software we are downloading is the actual software by authentication.

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

Now we need the Installation of the Docker Repository and update our system repository once more.

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt update

Now we can install Docker

sudo apt-get install docker-ce

Verifying Docker install

Use the command below to verify docker installation

docker –version

Start/enable Docker Service to run at boot

sudo systemctl start docker
sudo systemctl enable docker

Check docker status to verify that it is running

sudo systemctl status docker

Now that we have verified docker is installed and running we can now run our first container (we must do this as sudo).

Running your first docker container

Let's run the following command to run our first container

sudo docker run hello-world

Now that we have run our first container let's try a few other commands as well

Running a Fedora container in Docker on Ubuntu

Containers are virtual environments so you can run applications separately. Here we will briefly go over how to run a container

To run a container use the following command

sudo docker run “container name”

To run and interact with the container run the following command

sudo docker run -it “container name”

Example of running fedora on docker in Ubuntu

sudo docker pull fedora
sudo docker run -it fedora

Above you can see that now I am in a fedora terminal session.  To leave a container just type exit in the terminal.

Conclusion

And that it’s it. Now you can run your own virtual environments within Shells^TM. For more in-depth documentation you can click on the link below.

Docker Docs