Ruby CI with Jenkins

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In this short talk, Ishow some great ways you can use Jenkins to supercharge both the development AND deployment of your Ruby projects. Finally, I will demonstrate how you can extend the Jenkins CI server (which is written in Java) with nothing Ruby code. If you aren't getting the most out of your CI tools, or you aren't using a CI tool at all, then this is for you! Implementing a proper CI is a game changer to the way you and your team develop software.

Tecnologia

Ruby CI with Jenkins

• cowboyd@github
• cowboyd@twitter

Monday, March 5, 2012 1

Your Development
Process Needs CI

Monday, March 5, 2012 2

Not for code quality*

* this is still very important
Monday, March 5, 2012 3

You Need CI.
CI is crucial to
application distribution

Monday, March 5, 2012 5

Ruby deploys suck

Monday, March 5, 2012 6

Typical Deploy

• check out from source control
• bundle gems
• generate assets (rails/sprockets)
• and then more stuff...

Monday, March 5, 2012 7

Deploying from SCM
sucks

Monday, March 5, 2012 8

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

Bundling gems at
deploy-time sucks

Monday, March 5, 2012 10

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

Asset generation on
deploy sucks

Monday, March 5, 2012 12

Asset generation on
deploy sucks

• time consuming
• not tested anywhere else until go-time

Monday, March 5, 2012 13

If you’re going to
deploy, then deploy.

Monday, March 5, 2012 14

This is what we do

1. unpack application archive
2. restart server processes

Monday, March 5, 2012 15

This is how we do it

Monday, March 5, 2012 16

CI should verify a fully
assembled application,
not just its source code

Monday, March 5, 2012 17

Deploy a veriﬁed, fully
assembled application.

Monday, March 5, 2012 18

Deploy the output of
your CI

Monday, March 5, 2012 19

What we assemble

• Source Code
• Gem Bundle
• Static Assets (rails 3.1/Sprockets)
• Passenger
• Ruby

Monday, March 5, 2012 20

Pass

Deployable
Fail

Discard
Monday, March 5, 2012 21

Winning

• No (or very few) network dependencies
• No (or very few) host dependencies
• Fast!
• Idempotent deploys

Monday, March 5, 2012 22

Ruby deploys suck
because they grew up
with out CI

Monday, March 5, 2012 23

Zero-Conﬁg Install
apt-get install jenkins
yum install jenkins
chef, puppet and
friends

Monday, March 5, 2012 25

Extensible
400+ plugins to date

Monday, March 5, 2012 27

Ruby Tools!
Command Line
Plugin SDK

Monday, March 5, 2012 28

Ruby Plugins
Live Coding!!!

Monday, March 5, 2012 30

Ruby CI with Jenkins

• cowboyd@github
• cowboyd@twitter

Monday, March 5, 2012 31

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Ruby CI with Jenkins

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 Monday, March 5, 2012 27

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

Ruby CI with Jenkins

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