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

Step 1: Open the Terminal

To get started, open your terminal and run the following command to create a new script file:

sudo nano docker-install.sh

Step 2: Add Installation Commands

Next, paste the following lines of code into the newly created file. These commands will add Docker’s official GPG key, set up the Docker repository, and install Docker on your system:

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc


# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

# Install the Docker packages
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Verify that the Docker Engine installation is successful by running the hello-world image.
sudo docker run hello-world

Step 3: Make the Script Executable

After saving the file, make the script executable by running:

chmod +x docker-install.sh

Step 4: Run the Installation Script

Finally, execute the script and wait for the installation to complete:

./docker-install.sh

Following these steps will install Docker on your Ubuntu system, allowing you to run Docker containers seamlessly. Verify the installation by running the hello-world image to ensure everything is set up correctly.