My ScotlandJS 2015 talk about Containerisation and Docker.

1. and use DOCKER to
Build, Ship and Run
any App, Anywhere
FIRE YOUR SYSADMIN
SCOTLANDJS 2015 — PHIL REITHER

5. Django App
Database
Front-End
Workers
Email
Wordpress
Admin CRM
DEV DEV II LIVE STAGING QA INTERN

6. Django App
Database
Front-End
Workers
Email
Wordpress
Admin CRM
DEV DEV II LIVE STAGING QA INTERN

9. it
’s
A
c
o
m
p
an
y
!

10. what’s in
the box?
code,
runtime,
libs, bins

11. Why
should I
care?

12. • It’s the same everywhere.
• Separation of concerns.
• Minimal setup-up costs.
• Versioned environment.
ship the
entire
environment

13. Virtual
machine
DOCKER

14. }Host OS
Hardware
Docker
Bins & Libs Bins &
Libs
App
B
App
A’
App
A
Container
VirtualMachine
{
App
A
Bins &
Libs
OS
Hypervisor
Host OS
Hardware
OS
Bins &
Libs
App
A’
OS
Bins &
Libs
App
B

15. ~$#ps#&A#|#wc#&l#
235#
~$#docker#run#ubuntu#ps#&A#
PID##TTY##TIME######CMD#
##1##?####00:00:00##ps
Counting Processes

16. LXC

17. let’s
do this!

20. ~$#docker#search#node#
NAME##DESCRIPTION####################################STARS##OFFICIAL#
node##Node.js#is#a#JavaScript&based#platform#for...##685####[OK]#
iojs##io.js#is#an#npm#compatible#platform#origin...##65#####[OK]##
...#
~$#docker#run#node#
Unable#to#find#image#'node:latest'#locally#
latest:#Pulling#from#node#
29809ed33dfd:#Pulling#fs#layer#
...
Run an image

21. ~$#docker#run#&t#&i#ubuntu#/bin/bash#
root:##
root:##apt&get#install#&y#git#
Reading#package#lists...#Done#
Building#dependency#tree#
Reading#state#information...#Done#
...
Install things

22. ~$#docker#run#&v#~/Desktop/app:/code#&t#&i#node#
root:##
root:##ls#/code#
[files#from#host#/src/app]
Share folders

23. ~$#docker#ps#
ID############IMAGE##########COMMAND######NAME#
e7bf8f45d7be##ubuntu:latest##"/bin/bash"##sick_euclid#
~$#docker#commit#sick_euclid#phil/new_image#
cd9bd07d78733cb5a53fb1f41b5d2c99039fbd79a7526ce57410ca6df1e97e2b#
~$#docker#images#
REPOSITORY######TAG######IMAGE#ID######VIRTUAL#SIZE#
phil/new_image##latest###cd9bd07d7873##188.7#MB
Save images

25. too
easy!

26. docker-compose.yml
settings.py
Dockerfile
/code
Container “django”
postgres
Container “db”
~/Desktop/code

27. db:#
##image:#postgres#
django:#
##build:#.#
##command:#python#manage.py#runserver#0.0.0.0:8000#
##volumes:#
####&#.:/code#
##ports:#
####&#"8000:8000"#
##links:#
####&#db
docker-compose.yml - [host]

28. ~$#docker&compose#up#
Attaching#to#django_db_1,#django_web_1#
db_1##|#LOG:##database#system#is#ready#to#accept#connections#
web_1#|#Django#version#1.8.1,#using#settings#‘local.settings'#
...
Install things

29. FROM#python:2.7#
ENV#PYTHONUNBUFFERED#1#
RUN#mkdir#/code#
WORKDIR#/code#
ADD#requirements.txt#/code/#
RUN#pip#install#&r#requirements.txt#
ADD#.#/code/#
Dockerfile - [container “django”]

30. ...#
DATABASES#=#{#
####'default':#{#
####}#
}#
...
settings.py - [container “django”]
########'ENGINE':#'django.db.backends.postgresql_psycopg2',#
########'NAME':#'postgres',#
########'USER':#'postgres',#
########'PORT':#5432,#
########'HOST':#'db',#

31. docker-compose.yml
settings.py
Dockerfile
/code
Container “django”
postgres
Container “db”
~/Desktop/code

32. Docker
cheat
sheet
http://tinyurl.com/scotlandjsdocker