How to Install Docker on Ubuntu 22.04 (Step-by-Step Guide)

Docker is a powerful containerization platform that allows developers to build, ship, and run applications in isolated environments. In this tutorial, we will walk through the step-by-step process of installing Docker on Ubuntu 22.04 LTS.

📋 Prerequisites

Before you begin, make sure:

• You are running Ubuntu 22.04
• You have a non-root user with sudo privileges
• Your system is updated

Step 1: Update System Packages

First, update your package list to ensure you install the latest versions:

sudo apt update
sudo apt upgrade -y

Step 2: Install Required Dependencies

Install packages required to allow apt to use repositories over HTTPS:

sudo apt install apt-transport-https ca-certificates curl software-properties-common lsb-release -y

Step 3: Add Docker’s Official GPG Key

Add Docker’s official GPG key to verify package authenticity:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Step 4: Add Docker Repository

Add the official Docker repository to your 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

Step 5: Update Package List Again

Now update your package list to include Docker packages:

sudo apt update

Step 6: Install Docker Engine

Install Docker Engine, CLI, and containerd:

sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y

Step 7: Verify Docker Installation

Check if Docker is installed correctly:

sudo systemctl status docker

You should see Docker service running.

You can also check the Docker version:

docker --version

Step 8: Run Docker Without sudo (Optional but Recommended)

To avoid typing sudo every time:

sudo usermod -aG docker $USER

Then log out and log back in, or run:

newgrp docker

Test it:

docker run hello-world

If everything is working, you’ll see a confirmation message from Docker.

🚀 Enable Docker to Start on Boot

Docker usually enables itself automatically, but you can ensure it:

sudo systemctl enable docker

🎉 Conclusion

You have successfully installed Docker on Ubuntu 22.04. You can now start creating and running containers on your system.

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