How to Install Docker on Ubuntu

Docker is a popular containerization platform that allows developers to package applications and their dependencies into lightweight containers. This guide will walk you through the steps to install Docker on Ubuntu.

Step 1: Update Your System

Before installing Docker, ensure your system is up-to-date. Run the following commands:

sudo apt update
sudo apt upgrade

Step 2: Install Required Packages

Install the necessary packages to allow apt to use HTTPS:

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

Step 3: Add Docker’s Official GPG Key

Run the following command to add Docker’s GPG key:

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 Docker repository to your system:

echo "deb [arch=amd64 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: Install Docker

Update your package index and install Docker:

sudo apt update
sudo apt install docker-ce

Step 6: Verify Installation

Check if Docker is installed and running:

sudo systemctl status docker

You can also verify the Docker version:

docker --version

Step 7: Run Docker Without Sudo (Optional)

If you want to run Docker commands without using sudo, add your user to the Docker group:

sudo usermod -aG docker $USER

Log out and back in for the changes to take effect.

Conclusion

Congratulations! You have successfully installed Docker on Ubuntu. You can now start creating and managing containers for your applications.