How to Install Docker Engine on Ubuntu 18.04/20.04

Introduction

In the ever-evolving landscape of software development and system administration, Docker has emerged as a game-changer. It offers a streamlined way to containerize applications and their dependencies, simplifying deployment and ensuring consistency across different environments. If you're running Ubuntu 18.04 or 20.04, you're in the right place. This guide will walk you through the steps to install Docker Engine on your Ubuntu system.

Docker isn't just a tool; it's a revolution in how we approach software packaging and deployment. Whether you're a developer aiming to create efficient, reproducible environments or a system administrator seeking better resource utilization, Docker is a must-have in your toolkit. We'll explore multiple methods to ensure you can choose the one that suits your preferences and requirements.

So, let's embark on this journey to harness the power of Docker on your Ubuntu 18.04 or 20.04 system, empowering you to build, ship, and run applications effortlessly.

2. Method 1: The Classic Approach

Step 1: Update Package Repository

Begin by ensuring your system has the latest package information:

bash
sudo apt update

Step 2: Install Dependencies

Docker requires specific packages, so install them:

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

Step 3: Add Docker Repository

Docker packages aren't in the default Ubuntu repository, so add the Docker repository:

bash
echo "deb [signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu focal stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

For Ubuntu 18.04:

bash
echo "deb [signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu bionic stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Step 4: Install Docker Engine

With the repository added, install Docker Engine:

bash
sudo apt update
sudo apt install docker-ce

Step 5: Start and Enable Docker

Start Docker and enable it to run on boot:

bash
sudo systemctl start docker
sudo systemctl enable docker

Step 6: Verify Installation

Check the Docker version to ensure a successful installation:

bash
docker --version

Step 7: Test with a Container

Perform a straightforward examination to confirm that Docker is functioning properly:

bash
docker run hello-world

3. Method 2: Using Convenience Scripts

Docker provides installation scripts that simplify the process:

bash
curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh get-docker.sh

4. Method 3: Installing via Snap

If you prefer Snap, Ubuntu's package manager:

bash
sudo snap install docker

5. Conclusion

Congratulations, you've successfully navigated the installation of Docker Engine on your Ubuntu 18.04 or 20.04 system. With Docker, you're equipped to embrace the world of containerization and accelerate your development and deployment processes.

Whether you followed the classic method, used convenience scripts, or opted for Snap, you've gained a valuable skill that will prove beneficial in various aspects of your IT journey. Docker simplifies packaging, distribution, and management of applications, fostering consistency and efficiency.

As you continue your Docker journey, explore its vast ecosystem, experiment with different containers, and discover how it can optimize your workflows. The possibilities are endless, and Docker is your gateway to a more streamlined and agile approach to software development and system administration. Happy containerizing!

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