Dev Ops: A Gentle Introduction

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A gentle introduction into DevOps. Presentation given to Research and Development team at ACS, as part of a drive to strengthen Dev Ops culture across the entire company

Software

https://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Client-server-model.svg/1200px-Client-server-model.svg.png
Client –
Server
Architecture

https://g83jp346tayu3vege2q0y5tb-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/627x627-SftwareDev-Feature-HUSS.jpg

https://g83jp346tayu3vege2q0y5tb-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/627x627-SftwareDev-Feature-HUSS.jpg
Deliver Value
To Customers
Quickly

https://g83jp346tayu3vege2q0y5tb-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/627x627-SftwareDev-Feature-HUSS.jpg
Delay = loss
Bad Customer
Experience =
loss

https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png

https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png
Create
Change
- Add or modify
features
Create
Stability
- Create or
enhance
services

“There’s something
wrong with your
code….”

“There’s something
wrong with your
code….”
https://i.kym-cdn.com/entries/icons/original/000/012/468/shakeee.jpg

https://cdn-images-1.medium.com/max/2000/1*EBXc9eJ1YRFLtkNI_djaAw.png
Deliver Value To Customers Quickly

“There’s something
wrong with your
code….”
https://cdn-images-1.medium.com/max/1200/1*fmMYnozunnA4T8lLBX5JOg.jpeg

https://cdn-images-1.medium.com/max/2000/1*EBXc9eJ1YRFLtkNI_djaAw.png
Value
Collaboration
Communication
Product
Process
People
Culture

Symptoms of Bad DevOps
• Defects/bugs in production environment
• Inability to diagnose issues in quickly
• Problems appear in some environments only
• Blame shifting/finger pointing
• Long delays between Dev, QA, or another teams
• “Manual/human error” is a commonly cited root cause
• Releases fail
• Change is hard

“There’s something
wrong with your
code….”
https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png

Devops Core Values: CAMS
• Culture
• Automation
• Measurement
• Sharing: collaboration/feedback

“There’s something
wrong with your
code….”
Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

Practical: Automation
• Test Driven Development (TDD)
• CI/CD Pipeline

Practical: TDD
Test-driven
development
cycle

Practical: TDD
Automation +
software
design

Practical: TDD
• TDD String KATA
http://osherove.com/tdd-kata-1/
• IntelliJ IDE
• Dependency Injection

Practical: Continuous Integration /
Continuous Delivery

Modifying the schema of a production database is *hard*. If something goes wrong, the impact on both customers and the team can be enormous. And it can be hard or even impossible to rollback a database schema change if things go wrong. And the same is true for any architectural change for a production application. The Branch by Abstraction and Strangler Pattern makes significant application changes easier. Are there any similar patterns we can use to make production database changes less risky? Indeed, there are. The Expand/Contract pattern is a blueprint for making the database migration. It makes the remodelling both reversible and safe. By *expanding* the application to accommodate both the old and the new schemas in parallel, we can give ourselves time to: - Migrate any downstream dependencies on the old database schema - Gain confidence that the migration is safe We *contract* the application to the new version, once we’ve satisfied that the old schema is no longer needed. The pattern helps to make significant, but necessary refactorings to your data model in a **continuous delivery way**. Most importantly, without threatening the robustness of your production applications.

Expand Contract Pattern for Continuous Delivery of Databases by Leena S N at ...

Agile Software Community of India

Modifying the schema of a production database is hard. If something goes wrong, the impact on both customers and the team can be enormous. And it can be hard or even impossible to rollback a database schema change if things go wrong. And the same is true for any architectural change for a production application. The Branch by Abstraction and Strangler Pattern makes significant application changes easier. Are there any similar patterns we can use to make production database changes less risky? Indeed, there are. The Expand/Collapse pattern is a blueprint for making the database migration. It makes the remodelling both reversible and safe. By expanding the application to accommodate both the old and the new schemas in parallel, we can give ourselves time to: Migrate any downstream dependencies on the old database schema Gain confidence that the migration is safe We contract the application to the new version, once we’ve satisfied that the old schema is no longer needed. The pattern helps to make significant, but necessary refactorings to your data model in a continuous delivery way. Most importantly, without threatening the robustness of your production applications. While working with our product, I’ve successfully applied this pattern to make major changes to the core of the application, all while serving customers in production. I’ve learned some important lessons about how to best implement the Expand/Contract pattern. In this session, I’ll share my experiences on how to avoid pitfalls and succeed at these kinds of major data remodelling with hardly any downtime. More details: https://confengine.com/agile-india-2019/proposal/8174/expand-contract-pattern-for-continuous-delivery-of-databases Conference link: https://2019.agileindia.org

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Dev Ops: A Gentle Introduction

1. Dev Ops Leroy Dunn

2. https://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Client-server-model.svg/1200px-Client-server-model.svg.png Client – Server Architecture

3. https://g83jp346tayu3vege2q0y5tb-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/627x627-SftwareDev-Feature-HUSS.jpg

4. https://g83jp346tayu3vege2q0y5tb-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/627x627-SftwareDev-Feature-HUSS.jpg Deliver Value To Customers Quickly

5. https://g83jp346tayu3vege2q0y5tb-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/627x627-SftwareDev-Feature-HUSS.jpg Delay = loss Bad Customer Experience = loss

6. https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png

7. https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png Create Change - Add or modify features Create Stability - Create or enhance services

8. https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png Create Change - Add or modify features Create Stability - Create or enhance services

9. “It works on my machine…”

10. “There’s something wrong with your code….”

11. “There’s something wrong with your code….” https://i.kym-cdn.com/entries/icons/original/000/012/468/shakeee.jpg

12. https://cdn-images-1.medium.com/max/2000/1*EBXc9eJ1YRFLtkNI_djaAw.png Deliver Value To Customers Quickly

13. “There’s something wrong with your code….” https://cdn-images-1.medium.com/max/1200/1*fmMYnozunnA4T8lLBX5JOg.jpeg

14. “There’s something wrong with your code….” https://cdn-images-1.medium.com/max/1200/1*fmMYnozunnA4T8lLBX5JOg.jpeg

15. “There’s something wrong with your code….”

16. https://cdn-images-1.medium.com/max/2000/1*EBXc9eJ1YRFLtkNI_djaAw.png Value Collaboration Communication Product Process People Culture

17. Symptoms of Bad DevOps • Defects/bugs in production environment • Inability to diagnose issues in quickly • Problems appear in some environments only • Blame shifting/finger pointing • Long delays between Dev, QA, or another teams • “Manual/human error” is a commonly cited root cause • Releases fail • Change is hard

18. “There’s something wrong with your code….” https://assets4.botmetric.com/wp-content/uploads/2017/11/Ingraphics-devops-to-agile.png

19. Devops Core Values: CAMS • Culture • Automation • Measurement • Sharing: collaboration/feedback

20. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

21. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

22. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

23. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

24. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

25. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

26. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

27. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

28. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

29. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

30. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

31. Practical: Automation • Test Driven Development (TDD) • CI/CD Pipeline

32. Practical: TDD Test-driven development cycle

33. “There’s something wrong with your code….” Slide published by Mathew Jones, 3 October 2010, https://www.slideshare.net/geekle/devops-5348895/

34. Practical: TDD Automation + software design

35. Practical: TDD • TDD String KATA http://osherove.com/tdd-kata-1/ • IntelliJ IDE • Dependency Injection

36. Practical: Containerization

37. Practical: Continuous Integration / Continuous Delivery

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