Learn Docker

This repository is used to gain practical experience with Docker. To achieve this, the repository contains several examples of applications from which a container image can be created.

To learn about Docker, I use the book Docker - Das Praxisbuch für Entwickler und DevOps-Teams in the updated 4th edition by Bernd Öggl and Michael Kofler (ISBN 978-3-8362-9646-5)

Command reference

Generate images with a Dockerfile

docker build -t learn-docker/example-image .

Argument	Description
-t, --tag	Gives the image a name and optionally a tag (format: "name:tag")

Start a Container using an Image

docker run -d --name learn-docker/example -p 8080:80 learn-docker/example-image

Argument	Description
-d, --detach	Run container in background and print container id
--name	Assign a name to the container
-p, --publish	Publish a container's port(s) to the host
-h, --hostname	Container host name

Stop a running container

To stop a running container, run the following command in your terminal:

docker stop learn-docker/example

learn-docker/example has to be the name of the container, you want to stop.

Remove a stopped container

To remove a container and to keep the host system clean, run the following command in your terminal:

docker rm learn-docker/example

learn-docker/example has to be the name of the container, you want to remove.

Caution: To be able to delete a container, the execution must be terminated beforehand (see above)

List all running containers

In order to access a container that was started without specifying the --name argument, we must access the container using either the ID or the randomly generated name of Docker.

The following command can be used to retrieve the required information:

docker ps

Argument	Description
-a, --all	Show all containers (default shows just running)

Clean up Docker

The following command leaves the cleanup of all stopped containers (and other resources) to Docker:

docker system prune