This document provides an overview of Docker, containers, and related tools. It introduces Docker Inc. as the company that started the "hype" around Docker by open sourcing the Docker codebase in 2013. Containers are explained as a collection of kernel features like namespaces and cgroups that isolate processes. Popular container runtimes include Docker Engine, rkt, and App Container. Images are standardized read-only filesystems used to deploy applications in containers. Tools like Docker Machine, Docker Compose, Docker Swarm, and Kitematic help provision and manage containers. A voting application demo is shown to illustrate Docker in action.

1. What is Docker and
why is it so hot?
6th Docker Switzerland User Group Meetup

2. Who am I?
• Jochen Zehnder
• elft3r (GitHub / Twitter / Docker Hub / …)
• Software Developer @netIT-Services
• Automation of Datacenter Processes (a.k.a. Private Cloud)
• previously: SAP Systems
• currently: Oracle DBs
• Docker enthusiast
• since v0.6
• Co-Organizer Docker Switzerland Meetup

3. What / Who is Docker?

4. Docker Inc.
• The Company that started the ‘hype’
• previously called dotCloud
• open sourced docker code base in March 2013
• 23.03: Docker Birthday Celebration in Zurich
• ‘Build, Ship and Run any App, Anywhere’

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7
PROGRAMMING
What is the biggest
innovation multiplier today?

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Billions of creative people Incredible technology
4

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Mass innovation
5

8. (Docker) Containers

9. What are Containers?
https://www.docker.com/what-docker

10. What are Containers?
• Collection of kernel features
• OS specific
• Linux: “chroot on steroids” - Jérôme Petazzoni
• namespaces
• cgroups
• (copy-on-write storage)

11. Container Runtimes
• Docker Engine
• uses libcontainer (future runC)
• Docker Images
• rkt (by CoreOS)
• Docker Images
• App Container Images (appc)
https://github.com/coreos/rkt/blob/master/Documentation/rkt-vs-other-projects.md

12. Image
• Standardised Unit
• read-only filesystem containing
relevant binaries / libraries / …
• some configuration information
https://www.docker.com/what-docker

13. Docker Toolbox

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3
Our mission is to build
tools of mass innovation

15. Docker Toolbox
• Docker Engine
• Docker Machine
• Docker Compose
• Docker Swarm
• Docker Registry
• Kitematic

16. Docker Toolbox
• Docker Registry
• Application to store and distribute Docker Images
• e.g. Docker Hub a public Registry
• Kitematic
• Desktop GUI to manage Docker Containers
• Supports OS X, Windows and Linux

17. Docker Engine
• Core of the Docker Platform
• Build, Pull, Push, … Images
• Create, Update, Delete, … containers
• Manage networks, volumes, …

18. Docker Engine
https://docs.docker.com/engine/understanding-docker/

19. Docker Machine
• Provisioning of Docker Engines
• VirtualBox
• Amazon EC2
• DigitalOcean
• …
• Configuration of Docker client

20. Docker Compose
• Define multi-container applications
• uses ‘docker-compose.yml’ files
• describe each container

21. Docker Swarm
• Cluster support for Docker
• Groups multiple Docker Engines into a single,
virtual Docker Engine
• Scaling out / in of applications

22. Demo

23. Voting App
voting-app
redis
worker
db
result-app
https://github.com/docker/example-voting-app

24. Demo
20
Linux namespaces
M
ount
PID
IPC
U
ser
U
TS
Wireshark
N
et
M
ount
PID
IPC
U
ser
U
TS
N
et
App
M
ount
PID
IPC
U
ser
U
TS
VNC
N
et
/tmp/.X11-unix/
listen *:5901

25. Links
• http://www.slideshare.net/Docker/dockercon-eu-
day-1-general-session
• http://www.slideshare.net/Docker/the-latest-on-
docker-engine-55435952/19
• http://www.slideshare.net/Docker/cgroups-
namespaces-and-beyond-what-are-containers-
made-from