Installing Docker

We will be installing Docker in an Ubuntu system. For other OSs, please refer to https://docs.docker.com/engine/install/.

To install Docker, we need to install supporting tools to allow the apt package manager to download Docker through HTTPS. Let’s do so using the following commands:

$ sudo apt-get update
$ sudo apt-get install -y ca-certificates curl gnupg

Download the Docker gpg key and add it to the apt package manager:

$ sudo install -m 0755 -d /etc/apt/keyrings
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \
sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
$ sudo chmod a+r /etc/apt/keyrings/docker.gpg

Then, you need to add the Docker repository to your apt configuration so that you can download packages from there:

$ echo \
  "deb [arch="$(dpkg --print-architecture)" \
signed-by=/etc/apt/keyrings/docker.gpg] \
https://download.docker.com/linux/ubuntu \
"$(. /etc/os-release && echo ...