How to Install Docker on Ubuntu (Step-by-Step Guide)

Docker is a powerful containerization platform that simplifies application deployment. If you're looking to install Docker on your Ubuntu machine, follow this step-by-step guide.

Step 1: Update Ubuntu System

Open your terminal using Ctrl + Alt + T and update your system packages by running:

sudo apt update && sudo apt upgrade -y        

Step 2: Install Required Dependencies

Before installing Docker, install the necessary packages:

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

Step 3: Add Docker’s GPG Key & Repository

To ensure package authenticity, 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        

Then, add the official Docker 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 4: Install Docker

Update the package list:

sudo apt update        

Install Docker Engine:

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

Verify the installation:

docker --version        

You should see an output similar to:

Docker version 24.0.5, build 123abcxyz        

Step 5: Start & Enable Docker

Start the Docker service:

sudo systemctl start docker        

Enable Docker to start on boot:

sudo systemctl enable docker        

Check Docker’s status:

sudo systemctl status docker        

If it's running successfully, you’ll see an Active (running) status.

Step 6: Run Docker Without Sudo (Optional)

To allow running Docker without sudo, add your user to the Docker group:

sudo usermod -aG docker $USER        

Apply the changes by logging out and back in, or run:

newgrp docker        

Verify by running:

docker ps        

Step 7: Test Docker Installation

Ensure Docker is working correctly by running:

docker run hello-world        

If successful, you’ll see:

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

Conclusion

Congratulations! You’ve successfully installed Docker on your Ubuntu machine. Now you can start running containers and exploring Docker for your projects.

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