In this tutorial, we will show you how to install Docker on Ubuntu 20.04 LTS. For those of you who didn’t know, Docker is an open-source project that automates the deployment of applications inside the software container. The container allows the developer to package up all project resources such as libraries, dependencies, assets, etc.
This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you through the step-by-step installation of the Docker container on Ubuntu 20.04 Focal Fossa. You can follow the same instructions for Ubuntu 21.04, 18.04, 16.04, and any other Debian-based distribution like Linux Mint.
Install Docker on Ubuntu 20.04 LTS Focal Fossa
Step 1. First, make sure that all your system packages are up-to-date by running the following apt commands in the terminal.
sudo apt update sudo apt upgrade sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
Step 2. Installing Docker on Ubuntu 20.04.
It’s recommended to uninstall any old Docker software before proceeding:
sudo apt remove docker docker-engine docker.io
Now we enable the Docker repository, import the repository GPG key, and install the package:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
Next, add the Docker APT repository to your system:
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Once, that’s imported, update apt again and install it:
sudo apt update sudo apt install docker-ce docker-ce-cli containerd.io
To install a specific version, first list all the available versions in the Docker repository:
apt list -a docker-ce
Check for docker version:
$ docker --version Docker version 18.03.0-ce, build 0330e24
To check whether docker is running or not, type the following command:
systemctl status docker
To verify that Docker has been successfully installed and that you can execute the docker command without prepending sudo, we’ll run a test container:
docker container run hello-world
The command will download the test image, if not found locally, run it in a container, print a “Hello from Docker” message, and exit.
Congratulations! You have successfully installed Docker. Thanks for using this tutorial for installing the Docker container on Ubuntu 20.04 LTS (Focal Fossa) system. For additional help or useful information, we recommend you check the official Docker website.