Installation of Docker for Ubuntu (Linux) Users

This is a step-by-step tutorial on how to install Docker on a Linux operating system. Docker is an open-source technology that allows you to create, run, test, and deploy distributed applications inside software containers.

Prerequisites

  • A Linux distribution (such as Ubuntu, Debian, CentOS, etc.)

  • Internet access

  • Superuser (root) access to your machine

This guide will use Ubuntu as an example, but the process is similar for most Linux distributions.

Steps

Step 1: Update Package Lists for Upgrades and New Installations

  1. Open a terminal window.

  2. Update your existing list of packages by typing the following command and pressing enter: sudo apt update

Step 2: Install Pre-Requisite Packages

  1. Install the necessary packages that allow apt to use a repository over HTTPS: sudo apt install apt-transport-https ca-certificates curl software-properties-common

Step 3: Add Docker's GPG Key

  1. Download the Docker's official GPG key with this command: curl -fsSL <https://download.docker.com/linux/ubuntu/gpg> | sudo apt-key add -

Step 4: Add Docker Repository

  1. Add the Docker repository to APT sources: sudo add-apt-repository "deb [arch=amd64] <https://download.docker.com/linux/ubuntu> $(lsb_release -cs) stable"

Step 5: Update the Package Database with Docker Packages

  1. Update the package database again: sudo apt update

Step 6: Install Docker

  1. Now you can install Docker with the command: sudo apt install docker-ce

Step 7: Verify the Docker Installation

  1. Verify Docker installation by running the Docker hello-world image: sudo docker run hello-world

The output should look something like this:

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:4fe721ccc2e8dc7362278a29dc660d833570ec2682f4e4194f4ee23e415e1064
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.
...

Conclusion

If you see the "Hello from Docker!" message, congratulations! You have successfully installed and run a test Docker container on your Linux machine.

If you face any difficulties during the installation, please refer to Docker's official documentation or feel free to ask for assistance.

Additional Resources