Slides from a talk giving a very high level intro to docker.

1. Docker
Tim Haak
tim@haak.co @tim_haak

2. So you heard docker was
great

3. But what is docker?
and
Why all the noise

4. Its about simpler deployment
through packaging

5. Essentially
Docker
is a system to wrap your
Application
with its
Dependencies
in an
Isolated Environment
with
Networking

6. As Bonus
Ability to do Versioning
and
And Repeatability

7. Dockerfile's also
give
you simple
method
for describing
how to build an image.
Reduces bus factor

8. FROM ubuntu:15.10
MAINTAINER Tim Haak <tim@haak.co>
ENV TERM="xterm
DISPLAY=":0"
RUN apt-get update
RUN pt-get -y dist-upgrade
RUN apt-get install -y xvfb firefox
VOLUME ["/cache"]
EXPOSE 3129 3142 3143 4827
ENV PARENT_PROXY=""
SIBLING_PROXIES=""
CMD /usr/bin/firefox

9. Allows you to build
stateless infrastructure

10. Which fixes the
But it Worked on my pc

11. Simpler scaling
This still requires you to build your applications
correctly.
Though it makes it easier to do so.
Doesn't make the application magically scale

12. Allows you to run multiple version of a program on
one server
Even from different distribution.
ie. Apache 2.2 from Ubuntu and Apache 2.4 from
fedora.

13. Downsides
• Requires more storage
• Uses more memory as no sharing between
applications in different containers (Far less than
multiple virtual servers)
• Higher complexity for simple systems.

14. Why now
• Developer/Human time is becoming the most
expensive resource.
• Reduce complexity at cost of storage/some
memory
• Though fart less memory than a VM

15. Downsides
• Only linux (For now)
• Requires up to date kernel
• Images don't work across cpu architectures. ie Arm
and AMD64
• You can use the same docker file to build a new
image
• Its new and it works diffrently

16. What doesn't it solve
• Replication/Resiliency
• Bad code
• Its a tool that help with specific problems
• Its not a magic bullet

17. How do you to play with it
• Vagrant
• http://www.vagrantup.com
• Docker Machine (Boot2Docker)
• https://docs.docker.com/machine/

18. Demo time

19. Some definitions before we start
Image:
This is the snapshot or what your
running container will be created from.
Also can be used as the start of a new image.
Similar to a class in programming

20. Some definitions before we start
Container:
Running instance of an image.
Similar to and object in
programming.

21. tim@haak.co @tim_haakhttps://github.com/timhaak
Thanks