Docker is a containerization technology that allows you to run applications in isolated environments. This means that each application can run without affecting the others on the same system. Docker is popular because it makes it easy to package and ship applications. It is also easy to set up a Docker environment on your own computer.
In this guide, we will show you how to install Docker on an Ubuntu 22.04 server.
We will start by updating the list of available packages and installing Docker’s dependencies. We will then download Docker’s stable release from their official repository. Finally, we will configure Docker to start automatically at boot time.
Let’s get started!
Step 1 – Installing Docker’s Dependencies
Before we start installing Docker, we need to make sure that our server has the latest list of available packages. We can do this by running the `apt update` command:
sudo apt update
Docker requires a few dependencies in order to run properly on Ubuntu. We can install all of the required dependencies with the following command:
sudo apt install curl gnupg apt-transport-https ca-certificates curl software-properties-common
Step 2 – Adding the Docker Repository
Next, we need to add Docker’s official GPG key so that our server can trust the packages that we will download from Docker’s repository. We can do this with the following curl command:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
Now that we have Docker’s GPG key, we can add the Docker repository to our server. We can do this with the `add-apt-repository` command:
sudo add-apt-repository "deb https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Step 3 – Installing Docker on Ubuntu
Now that we have added the Docker repository to our server, we need to update the package index one more time:
sudo apt update
Now that the package index is up-to-date, we can install Docker with the following command:
sudo apt install docker-ce docker-ce-cli containerd.io
Docker should now be installed on your Ubuntu server.
Step 4 – Configuring Docker to Start at Boot
By default, Docker is not configured to start automatically when the server boots. We can change this behavior with the `systemctl` command:
sudo systemctl enable docker
Now, Docker will start automatically any time that our server reboots.
Conclusion
In this guide, we have shown you how to install Docker on an Ubuntu 22.04 server. We have also shown you how to configure Docker to start automatically at boot time. Now that Docker is up and running, you can start using it to run your applications in isolated environments.