Docker 101: How to Install Docker on Ubuntu Server 22.04
Compared to other solutions, Docker is more user-friendly, offers many graphical applications (so you don’t always have to work from the command line), and is supported on Linux, macOS, and Windows.
Also: Docker 101: why you should use containers
I have deployed hundreds of applications and services with this tool and found it to be an invaluable part of my daily workflow. In many cases, deploying the containerized application via Docker is much faster and more reliable than manually deploying the same application/service.
Ready? Let’s go to the installation.
Installation on Ubuntu
1. Add the necessary repository
The first thing you need to do is login to your Ubuntu instance and add the necessary repository (because the version of Docker found in the standard repository is not the latest community edition we want). Once connected, add the official Docker GPG key with the command:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg –dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
Next, add the official Docker repository:
echo “deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable” | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
2. Install necessary dependencies
We will then install the required dependencies with the command:
sudo apt-get install apt-transport-https ca-certificates curl gnupg lsb-release -y
3. Install Docker
Finally, update apt and install Docker with the following commands:
sudo apt-get update sudo apt-get install docker-ce docker-ce-cli containerd.io -y
4. Add your user to the Docker group
In order to be able to use Docker without having to invoke it with sudo (which can lead to security issues), you need to add your user to the docker group with:
sudo usermod -aG $USER docker
Log out and log back in for the changes to take effect.
Docker is now ready to use on your Ubuntu machine.
Test the installation
Once Docker is installed, you can verify the installation by running the command:
In the output, you should see something like this:
Server: Docker Engine – Community Engine: Version: 20.10.14
Let’s make sure your user can run a Docker command by dropping the hello-world image with:
If the image is successfully pulled, congratulations, Docker is installed and ready to go. Next time you will learn how to deploy your first container with Docker.