1.
Ruby CI with Jenkins
• cowboyd@github
• cowboyd@twitter
Monday, March 5, 2012 1

2.
Your Development
Process Needs CI
Monday, March 5, 2012 2

3.
Not for code quality*
* this is still very important
Monday, March 5, 2012 3

4.
For deployment
Monday, March 5, 2012 4

5.
You Need CI.
CI is crucial to
application distribution
Monday, March 5, 2012 5

6.
Ruby deploys suck
Monday, March 5, 2012 6

7.
Typical Deploy
• check out from source control
• bundle gems
• generate assets (rails/sprockets)
• and then more stuff...
Monday, March 5, 2012 7

8.
Deploying from SCM
sucks
Monday, March 5, 2012 8

9.
Deploying from SCM
sucks
• If Github is getting DDOS’d should that
mean you can’t deploy?
• Branches and tags can be moving targets
• server affinity for a particular branch
Monday, March 5, 2012 9

10.
Bundling gems at
deploy-time sucks
Monday, March 5, 2012 10

11.
Bundling gems at
deploy-time sucks
• Why should my deploy depend on
rubygems.org?
• My app is about to go live. Is now really the
best time to be compiling C extensions?
Monday, March 5, 2012 11

12.
Asset generation on
deploy sucks
Monday, March 5, 2012 12

13.
Asset generation on
deploy sucks
• time consuming
• not tested anywhere else until go-time
Monday, March 5, 2012 13

14.
If you’re going to
deploy, then deploy.
Monday, March 5, 2012 14

15.
This is what we do
1. unpack application archive
2. restart server processes
Monday, March 5, 2012 15

16.
This is how we do it
Monday, March 5, 2012 16

17.
CI should verify a fully
assembled application,
not just its source code
Monday, March 5, 2012 17

18.
Deploy a verified, fully
assembled application.
Monday, March 5, 2012 18

19.
Deploy the output of
your CI
Monday, March 5, 2012 19

20.
What we assemble
• Source Code
• Gem Bundle
• Static Assets (rails 3.1/Sprockets)
• Passenger
• Ruby
Monday, March 5, 2012 20

21.
Pass
Deployable
Fail
Discard
Monday, March 5, 2012 21

22.
Winning
• No (or very few) network dependencies
• No (or very few) host dependencies
• Fast!
• Idempotent deploys
Monday, March 5, 2012 22

23.
Ruby deploys suck
because they grew up
with out CI
Monday, March 5, 2012 23

24.
Why Jenkins?
Monday, March 5, 2012 24

25.
Zero-Config Install
apt-get install jenkins
yum install jenkins
chef, puppet and
friends
Monday, March 5, 2012 25

26.
Open Source
Monday, March 5, 2012 26

27.
Extensible
400+ plugins to date
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28.
Ruby Tools!
Command Line
Plugin SDK
Monday, March 5, 2012 28

29.
Ruby CLI
Monday, March 5, 2012 29

30.
Ruby Plugins
Live Coding!!!
Monday, March 5, 2012 30

31.
Ruby CI with Jenkins
• cowboyd@github
• cowboyd@twitter
Monday, March 5, 2012 31