Docker

Docker is used to create containers. In a container system resources are separated from each other e.g. to create a development environment where the developer can experiment freely without the risk of jeopardizing the host system.

A dockerfile defines what will be in the docker image, running the image will create a container.

Installation

apt install docker.io
apt install docker-buildx

This creates a working container

Dockerfile in /etc/docker

FROM ubuntu
LABEL name="Hans de Ridder"
RUN apt-get update
CMD ["bash", "-i"]

docker build /etc/docker

This build the image

docker image ls

List all existing images

docker run -it <image ID>

Create the container and open a bash prompt in it. When leaving the shell the container is closed