In this part, we'll install Docker Engine on an Ubuntu 22.04 server and confirm everything works.
Step 1 — Update Your Package Index
sudo apt update
sudo apt upgrade -y
Step 2 — Install Required Dependencies
sudo apt install -y ca-certificates curl gnupg
Step 3 — Add Docker's Official GPG Key and Repository
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
Step 4 — Install Docker Engine
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
Step 5 — Verify the Installation
sudo docker run hello-world
If you see a "Hello from Docker!" message, your installation is working correctly.
Optional — Run Docker Without sudo
sudo usermod -aG docker $USER
Log out and back in for this to take effect. Next up: working with Docker images.