This document provides an introduction to Docker. It discusses how Docker adds packaging, distribution and a simple interface to existing container technologies like LXC and namespaces/cgroups. Docker allows building images from applications and libraries and running containers from those images. The Docker architecture includes a client, daemon, images and containers. A demo is provided of building an image and running a container. Attendees are encouraged to try Docker for its benefits of speed, portability and as building blocks for microservices architectures.

1. Eine Einführung in Docker
DevOps Conference – 01.06.2015
Matthias Lübken
the product guy
@luebken

3. Giant Swarm
•Simple way to get your
containers running
•Currently in alpha
•Looking for feedback
https://giantswarm.io/request-invite/

5. Agenda
• App container
• Container technologies
• And Docker?
• Docker concepts
• Demo

6. Why are we so excited?

7. #1 Speed

8. #2 Portability

9. #3 Building block

10. App container?

11. Docker is an open platform for
developers and sysadmins of
distributed applications.”
“

12. Docker is an open-source project to
easily create lightweight, portable,
self-sufficient containers from any
application.”
“

14. Cloud architectures
Reactive Manifesto
Microservices

15. App containers!

16. Technologies

17. Operating-system-level
virtualization

18. Control Groups
•A unified interface for controlling processes
•Resource limitation
•Priorization
•Accounting
•Controling
•CPU Time, System memory, Disk bandwidth,
Network bandwidth, Monitoring

19. Namespaces
•Provide varying views on the system
•To provide isolated environments
•6 Namespaces: PID, NET, IPC, MNT, UTS, User

20. LXC
• Leverages Kernel features: namepaces & cgroups
• User-land tools: lxc-create, lxc-start, lxc-info
• Docker used to use LXC

21. Union Filesystem
• Files and directories of separate file
systems
• Transparently overlaid
• Forming a single coherent file system.
• Copy-on-write
• Different options AuFS, Btrfs,
OverlayFS, DeviceMapper

22. What does Docker add?

26. packaging & distribution
simple interface
Docker adds

27. Docker concepts

28. Images
Ubuntu
Kernel
Redis
my lib
parent image

29. Container
Ubuntu
Kernel
Redis
my lib
my app

30. Architecture
Docker Client
$ docker build
$ docker run
$ docker push
Docker Daemon
Container A
Container B
Container C
Client Host
…

31. Architecture
Docker Client
$ docker build
$ docker run
$ docker push
Docker Daemon
Container A
Container B
Container C
Client Host
Image ‘
Image ‘’
Image ‘’’
Registry
$ docker push
$ docker pull
…
…

32. On my Mac
Docker Client
$ docker build
$ docker run
$ docker push
Docker Daemon
Container A
Container B
Container C
Client Host
Image ‘
Image ‘’
Image ‘’’
Registry
$ docker push
$ docker pull
hub.docker.com
…
…

33. Demo

34. https://gist.github.com/luebken/
327eac541f939e2202a2

35. dockerbook.com

36. So should I start with Docker?

37. YES

38. Containers are 1% of your problem”“
Kelsey Hightower, CoreOs

39. Request an invite at
https://giantswarm.io
Matthias Lübken
the product guy
@luebken

40. Giant Swarm
•Simple way to get your
containers running
•Currently in alpha
•Looking for feedback
https://giantswarm.io/request-invite/