Introduction to Docker talk given at 0Redev in Malmo, Sweden in November 2014.

1. Introduction to Docker
Containerization is the new virtualization
James Turnbull
@kartar
1

2. who
• VP of Engineering at Kickstarter
• Advisor at Docker
• Open source chap
• Funny accent
2

3. Kickstarter live in
Sweden
3

4. The Docker Book
www.dockerbook.com
4

5. Who are you folks?
5

6. What's this all about?
6

7. What is Docker?
7

8. Container
virtualization
8

9. Build, ship, run
9

10. Build once
10

11. Run in many places
11

12. Isolated
Layered
Standard
Content agnostic
12

13. But this isn't new?!?
13

14. So why should I care?
Software delivery mechanism
Portability
A bit like a VM but ...
14

15. ... not like a VM
1. Containers boot faster
2. Containers have less overhead
3. Containers bring native performance
4. Containers are Cloud & VM-compatible
15

16. Devs care about their
app
Ops cares about the
containers
16

17. Why developers care...
• Clean, safe, hygienic and portable
• No worries about dependencies
• Encourage good architecture
17

18. Why operations care...
• Make the lifecycle more efficient
• Eliminate inconsistencies
• Support segregation of duties
18

19. What can I use Docker for?
• Docker for CI/CD
• Packaging and deploying applications
• Build your own PAAS
• Deploy applications at hyperscale!
19

20. Does this work with Puppet or Chef?
• Chef and Puppet are state management tools
• Less complex
• Docker images are version controlled and layered
• Smaller, self-contained and lightweight
20

21. Technology Stack
• Runs on most Linux distros
• Boot2Docker for OSX and Windows
• Windows in the works!
• Uses Linux kernel features
21

22. Docker Basics
Image & Dockerfile
The Docker Hub
Container
22

23. Building Docker images
FROM ubuntu
MAINTAINER James Turnbull "james@example.com"
RUN apt-get -qqy update
RUN apt-get install -qqy apache2
ADD index.html /var/www/
ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
VOLUME [ "/var/log/apache2" ]
EXPOSE 80
ENTRYPOINT ["/usr/sbin/apache2"]
CMD ["-D", "FOREGROUND"]
23

24. Building the image
$ sudo docker build -t="jamtur01/0redev" .
24

25. Sharing the image
$ sudo docker push jamtur01/0redev
25

26. Running the container
$ sudo docker run --name mywebsite -ti -p 80:80 jamtur01/0redev
26

27. But there's more!
27

28. What if we could
componentize . . .
28

29. SSH
29

30. Managing a container
$ sudo docker exec -ti mywebsite /bin/bash
30

31. Scheduling and jobs
31

32. Logging
32

33. Logging container
$ sudo docker run --volumes-from mywebsite -ti ubuntu tail -f /var/log/apache2/acccess.log
33

34. Creates a new
architecture
34

35. A new architecture that ...
• Separates orthogonal concerns
• Don't rebuild your app to change services
• Have different policies in domains
• Ship lighter apps
35

36. Questions?
36