Welcome to this step-by-step guide on installing Docker on Ubuntu (Linux). Docker is an open-source platform that allows you to automate the deployment, scaling, and management of applications using containerization. By following this guide, you will be able to successfully install Docker on your Ubuntu system and start using it to build and run containerized applications.

Prerequisites

Before we begin, make sure you have the following prerequisites:

• An Ubuntu system (version 18.04 or higher)
• Root or sudo access

Step 1: Update System Packages

The first step is to update your system packages to ensure you have the latest versions. Open a terminal and run the following command:

sudo apt update

Step 2: Install Docker Dependencies

Next, we need to install some dependencies required by Docker. Run the following command to install the necessary packages:

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

Step 3: Add Docker’s GPG Key

Docker packages are signed with a GPG key to ensure their authenticity. 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

We need to add the Docker repository to our system’s list of software sources. Run the following command to add the repository:

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 Engine

Now we can finally install Docker Engine. Run the following command to install Docker:

sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io

Step 6: Start and Enable Docker

Once Docker is installed, you need to start and enable the Docker service. Run the following commands:

sudo systemctl start docker
sudo systemctl enable docker

Step 7: Verify Docker Installation

To verify that Docker has been installed successfully, run the following command to check the Docker version:

docker --version

If Docker is installed correctly, you should see the version number displayed in the terminal.

Step 8: Manage Docker as a Non-Root User (Optional)

By default, Docker requires root or sudo access to run commands. However, you can add your user to the “docker” group to allow it to run Docker commands without root privileges. Run the following command to add your user to the “docker” group:

sudo usermod -aG docker $USER

Remember to log out and log back in for the changes to take effect.

Useful Docker Commands

Here are some useful Docker commands to help you get started:

Command	Description
docker run IMAGE	Run a container from an image
docker ps	List running containers
docker images	List available images
docker stop CONTAINER	Stop a running container
docker rm CONTAINER	Remove a stopped container
docker rmi IMAGE	Remove an image

Conclusion

Congratulations! You have successfully installed Docker on your Ubuntu system. You can now start using Docker to build, run, and manage containerized applications. Remember to refer to the Docker documentation for more advanced usage and explore the vast Docker ecosystem.

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