Docker uses the kernel of the host system and the host operating system, applications and their dependencies run in a container isolated from the rest. The container image contains the application to be run plus all necessary libraries.

A docker file has to be create to know what has to go into the docker image.

For gentoo https://wiki.gentoo.org/wiki/Docker emerge app-containers/docker and docker-cli for the docker command line command.

for systemd systemctl enable docker.service or for OpenRC rc-update add docker default

usermod -aG docker <username>

docker run hello-world

docker ps

docker inspect hello-world

docker --help

https://hub.docker.com is the repository, when no local container is found then it will be used

docker compose uses YAML configuration files to handle multiple containers together

partainer is a gui for docker and docker compose

An alternative to docker is podman