Hello, friends. We already know that Ubuntu 22.04 has been released and so many sysadmins are preparing to upgrade their systems or take advantage and deploy others. Today, you will learn how to install Docker on Ubuntu 22.04. This tool is vital to many today.
What is Docker?
Docker is a software development platform for virtualization with multiple operating systems running on the same host. This is made possible by containers that are distributed as images.
The system is very lightweight because it does not incorporate an operating system, which also allows for better use of resources. Docker also allows applications to be isolated, which is very useful for testing without bringing down the client’s production server.
Although Docker is a very complex technology, it can be easily controlled through a series of commands.
Unlike virtual machines that can communicate with the host hardware, Docker containers run in an isolated environment on top of the host operating system.
Installing Docker on Ubuntu 22.04 using the external repository
Once we’re ready, you can update the whole system
sudo apt update sudo apt upgrade
Thereafter, install some packages needed for Docker installation
sudo apt-get install ca-certificates curl gnupg lsb-release
Then, as we are going to install Docker using the official Docker repositories, we have to download and add the GPG key from this repository.
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
After this, add the Docker repository to the system
echo "deb [arch=$(dpkg --print-architecture) 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
Now refresh APT so that the package manager recognizes the packages in this new repository.
sudo apt update
Thereafter, we can install Docker on Ubuntu 22.04
sudo apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin
After the installation has finished, you can check the version that has been installed on the system
You will get an output screen like this
Docker version 20.10.14, build a224086
Managing the Docker service in Ubuntu 22.04
Before using it, it’s good to know that Docker is installed and a service is added to the system with which we can start, stop, restart and check the status.
To start Docker, you can run
sudo systemctl start docker
Or to stop it
sudo systemctl stop docker
When you apply changes to the Docker configuration, you will need to restart Docker to apply the changes. This can be done with the following command.
sudo systemctl restart docker
Finally, you can check the status of the service to know if it is running
sudo systemctl status docker
Testing Docker on Ubuntu 22.04
Docker requires root permissions by default, but we can change this by adding our user to the Docker group.
sudo usermod -aG docker $USER
This way, we will be able to use Docker from our regular user.
The best way to test if Docker is working properly is to run a test image.
The test image is called
To run it, just run
docker run hello-world
Docker isready for the work
Docker is an important technology in our world, that is why we have to learn how to install it on a system like Ubuntu 22.04. Now that you know how to install it, you can try it by yourself.