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What is Docker?

Docker is an open-source platform that automates the deployment, scaling, and management of applications using containers. Containers allow you to package an application and its dependencies together, ensuring it runs consistently across different computing environments.

Docker simplifies the development and operations (DevOps) process by creating isolated environments where applications can run with minimal overhead. It eliminates the “works on my machine” problem, enabling developers to build, test, and deploy applications quickly and reliably.

Add Docker’s official GPG key

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

Start Docker service 

sudo systemctl enable docker
sudo systemctl start docker
sudo systemctl status docker

Run docker without sudo

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

sudo reboot now

Docker Compose

sudo curl -SL https://github.com/docker/compose/releases/download/v2.30.3/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose

sudo chmod +x /usr/local/bin/docker-compose

Hello World from Docker

docker run hello-world