Install Docker on Ubuntu

To install Docker on Ubuntu, follow these steps:

1. Uninstall Old Versions (Optional)

If you have older versions of Docker installed, remove them:

sudo apt-get remove docker docker-engine docker.io containerd runc

2. Update Package Information

Update your existing package list:

sudo apt-get update

3. Install Required Packages

Install necessary prerequisites for Docker:

sudo apt-get install -y ca-certificates curl gnupg

4. Add Docker’s Official GPG Key

Add Docker's official GPG key for verifying the repository:

sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

5. Set Up the Docker Repository

Add the Docker repository to your sources list:

echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

6. Update the Package Index

Update the package index to include the Docker repository:

sudo apt-get update

7. Install Docker Engine

Install Docker Engine, containerd, and Docker CLI:

sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

8. Verify Docker Installation

Check if Docker is installed and running:

sudo docker --version
sudo docker run hello-world

9. Optional: Run Docker Without sudo

To allow your user to run Docker without sudo:

sudo groupadd docker
sudo usermod -aG docker $USER
newgrp docker

Test again by running:

docker run hello-world

This will install Docker and set it up properly on your Ubuntu system.