How to Install Docker on Ubuntu 24.04: A Step-by-Step Guide

Docker has revolutionized the way developers build, ship, and run applications by simplifying and streamlining the process with its platform’s containerization technology. If you’re looking to get started with Docker on Ubuntu 24.04, this guide will walk you through the installation process step by step, addressing common issues you might encounter and ensuring a smooth setup.

Prerequisites

Before you begin, make sure you have a running instance of Ubuntu 24.04. You’ll need sudo privileges to execute administrative commands. It’s also a good practice to update and upgrade your system packages:

bashCopy codesudo apt update
sudo apt upgrade -y

Step 1: Install Required Packages

Docker requires certain packages to allow apt to use a repository over HTTPS:

bashCopy codesudo apt install apt-transport-https ca-certificates curl software-properties-common gnupg lsb-release -y

Step 2: Add Docker’s Official GPG Key

This step ensures the authenticity of the Docker packages:

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

Step 3: Set Up the Stable Repository

Set up the Docker repository to fetch the latest Docker software:

bashCopy codeecho "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 4: Install Docker Engine

Update your package index and install Docker Engine, CLI, and containerd:

bashCopy codesudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io -y

Step 5: Verify Docker Installation

Run the Hello World Docker image to confirm that Docker has been installed correctly:

bashCopy codesudo docker run hello-world

This should display a message from Docker confirming that the installation is working.

Step 6: Managing Docker Permissions

To use Docker as a non-root user, you should add your user to the Docker group:

bashCopy codesudo usermod -aG docker ${USER}

Log out and back in again to apply these new group settings.

Step 7: Enable Docker to Start on Boot

Ensure Docker starts with your system:

bashCopy codesudo systemctl enable docker

Step 8: Dealing with Common Errors

After installation, you might encounter an error like:

arduinoCopy codedocker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.

This usually means the Docker service isn’t running. Start it with:

bashCopy codesudo systemctl start docker

And ensure it’s enabled:

bashCopy codesudo systemctl enable docker

Check that Docker is running smoothly:

bashCopy codesudo systemctl status docker

Conclusion

Congratulations! You’ve successfully installed Docker on Ubuntu 24.04 and are ready to begin containerizing your applications. Docker offers a robust platform for developing and deploying applications consistently, helping you avoid the “it works on my machine” headache. Happy Dockerizing!

Additional Resources

For more detailed information about Docker and to explore advanced features, check the official Docker documentation. It’s a valuable resource for best practices, tutorials, and troubleshooting tips.

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