This document summarizes Toomas Römer's talk about his experiences using Jenkins. Some key points: 1) Römer has been using Jenkins since 2008 for various purposes like building, testing, and releasing software. 2) In 2013, Römer's team was using Jenkins to manage 300-600 jobs across 8-20 machines, processing around 7000 hours on Amazon per month. 3) Stories are shared about managing a large Jenkins cluster with many projects, running functional JDK tests as Jenkins jobs, and interacting with Jenkins via its API.

1. Jenkins (War)stories
Toomas Römer
ZeroTurnaround
Tartu, Estonia
@toomasr
Thursday, October 10, 13

2. Why this talk?
• Logical step from previous unit test topic
• I’m a Jenkins fanboy :)
• Maybe I can inspire you!?
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3. Why talk about Jenkins?
• First Jenkins installation in 2008
– Have administered
– Have used as a developer
– Have developed plugins for it
– Still using daily but more like a manager
– Good friends with Cloudbees people
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4. What have I done with Jenkins?
Built-tested-released software
Implemented continuous delivery
Updated websites (docs, changelogs etc.)
Propagating code or binary artifacts
Workflow management
Thursday, October 10, 13

5. Why so popular?
Authentication
Authorization
Logging
Notifications
Distributed
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6. Cron on Steroids
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7. Enterprise Cron
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8. Background - 2013
300 600 jobs
8 20 dedicated machines
Amazon ~7000 instance-hour per month
3 4 in house plugins developed, 2
abandoned
Custom dashboard (35 x 215 grid)
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9. Jenkins Overlords
• Jenkins Overlord
– Actually his name is Juri
• Each project has a goto guy
– Works with Juri when something
bad happens, also known as an
Overlord :)
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10. Stories
Stories
–Managing the cluster
–Functional Tests
–Servlet Tests
–The API
–Random thoughts
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11. Managing the cluster
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12. Managing the cluster
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13. Managing the cluster
• Lots of projects but 1 Jenkins cluster
– Java
– Application server X
– Database server X
– Framework X
– PHP/Python/Groovy/SBT/Maven
– Play Framework
– Android
– Eclipse
– ....
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14. Managing the cluster
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15. Managing the cluster
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16. Functional Tests
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17. JRebel Functional JDK Tests
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18. JRebel Functional JDK Tests
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19. JRebel Functional JDK Tests
Per JDK
– Per functional test
• Compile couple of classes
• Run some methods and assert
• Recompile couple of classes
• Run some methods and assert
• …
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20. JRebel Functional JDK Tests
Which Jenkins feature is the best fit here?
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21. JRebel Functional JDK Tests
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22. JRebel Functional JDK Tests
Groovy Script
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23. JRebel Functional JDK Tests
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24. JRebel Functional JDK Tests
How to get test results? Jenkins feature…
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25. JRebel Functional JDK Tests
Output JUnit XML!
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26. JRebel Functional JDK Tests
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27. Jenkins API
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28. API
• Java/JavaScript/Python and others
• Super easy to get started (show demo)
• Retrieve info about Jenkins
• Trigger builds
• Create/copy jobs
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29. 29
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30. 30
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31. Custom Dashboard
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32. Random thoughts
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33. There is an app
plugin for that
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34. Green Balls
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35. Green Balls
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36. Prep releases
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37. Q & A
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