Docker

Docker allows to Run Docker Container which contain pre compiled code and are mostly not bound to any OS. It is similar to a VM, but the Docker Container is not an OS and can be adjusted so that Processes inside can access the Hostsystem.
https://www.docker.com/why-docker
https://docs.docker.com/engine/install/debian/
https://www.docker.com/blog/happy-pi-day-docker-raspberry-pi/

Docker Installation

Requirements

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

Download Script for easy installation

curl -fsSL get.docker.com -o get-docker.sh && sh get-docker.sh

Add pi-User to Docker to allow starting without sudo rechten

sudo usermod -aG docker pi

Add Docker to Source.list for easy update and upgrade

Get Docker Public Key for Raspbian Docker Version

sudo curl https://download.docker.com/linux/raspbian/gpg

Open Source.list to add Source Path for the Docker Software

sudo nano /etc/apt/sources.list

Add to Source path to the File

deb https://download.docker.com/linux/raspbian/ buster stable

Use CTRL + X to close the Editor and Y and than Enter to Save Changes

Perform an Update and Upgrade

sudo apt update && sudo apt -y upgrade

Start Docker Service

sudo systemctl start docker.service

Install Docker Compose that manages the Docker container

sudo apt install docker-compose -y

Useful Docker Commands

Display Info about Docker installation and Running Container

sudo docker info