In this session, I look at the challenges that real companies face when trying to adopt the good practices that fall under the banner of Continuous Delivery. To do this, we’ll start by extracting the core concepts described in the book Continuous Delivery by Jez Humble and Dave Farley, and look at how these map to the practices of typical organisations today. We’ll dig deep into the relationship between Agile and Continuous Delivery, how DevOps and infrastructure-as-code fit into the delivery process, and its impact on software development practices, especially version control.

1. Real world con,nuous delivery
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@SoftArchConf #SoftwareArchitect2015
Seb Rose

2. @sebrose h+p://cucumber.io

3. @sebrose h+p://cucumber.io
con5nuous :
-­‐ forming an unbroken whole
-­‐ without interrup5on
discrete :
-­‐ individually separate and dis5nct

4. @sebrose h+p://cucumber.io
delivery :
-­‐ the ac5on of delivering goods
-­‐ the process of giving birth

5. @sebrose h+p://cucumber.io
con5nuous delivery :
-­‐ a set of prac5ces and principles
aimed at, building, tes5ng, and
releasing soBware, faster and
more frequently
-­‐ this principle helps reduce the
cost, 5me and risk of delivering
incremental changes to users.

6. @sebrose h+p://cucumber.io
con5nuous integra5on :
-­‐ a development prac5ce that
requires developers to integrate
code into a shared repository
several 5mes a day
-­‐ each check-­‐in is verified by an
automated build, allowing teams
to detect problems early

7. @sebrose h+p://cucumber.io
con5nuous deployment :
-­‐ the next step of con5nuous
delivery
-­‐ every change that passes the
automated tests is deployed to
produc5on automa5cally

8. @sebrose h+p://cucumber.io
audience calisthenics

9. @sebrose h+p://cucumber.io
Con5nuous integra5on
h+p://www.jamesshore.com/Blog/Con5nuous-­‐Integra5on-­‐on-­‐a-­‐Dollar-­‐a-­‐Day.html

10. @sebrose h+p://cucumber.io
Automated deployment
h+p://www.moltecinterna5onal.com/images/robots.jpg
and rollback!

11. @sebrose h+p://cucumber.io
Artefact repository
h+p://3.bp.blogspot.com/-­‐BkxV4lCQzDw/U96FMUNIDAI/AAAAAAAAK_s/GMmneXG5FG4/
s1600/RoleOfAR.png

12. @sebrose h+p://cucumber.io
Fidelity vs. feedback
h+p://3.bp.blogspot.com/-­‐BkxV4lCQzDw/U96FMUNIDAI/AAAAAAAAK_s/GMmneXG5FG4/
s1600/RoleOfAR.png
More production-like
Slower feedback

13. @sebrose h+p://cucumber.io
h+ps://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Devops.svg/2000px-­‐
Devops.svg.png
Collabora5on

14. @sebrose h+p://cucumber.io
Conway slaw :
-­‐ a popular dish of shredded
cause and effect mixed
with a dash of sociology

15. @sebrose h+p://cucumber.io
Branching
-­‐ Feature branching
-­‐ GitFlow
-­‐ CoDe:U Git Flow
-­‐ Trunk-­‐based development
-­‐ Release branching

16. @sebrose h+p://cucumber.io
Branching strategies
h+p://nvie.com/img/git-­‐model@2x.png h+p://www.praqma.com/sites/default/files/img/git_flow_web.pdf

17. @sebrose h+p://cucumber.io
Trunk-­‐based development
h+p://paulhammant.com/images/mainline_vs_trunk.png

18. @sebrose h+p://cucumber.io
h+ps://youtu.be/30yN4hefrt0
Branching strategies

19. @sebrose h+p://cucumber.io
Tes5ng pyramid
h+p://claysnow.co.uk/architectural-­‐alignment-­‐and-­‐test-­‐induced-­‐design-­‐damage-­‐fallacy/

20. @sebrose h+p://cucumber.io
Acceptance tes5ng

21. @sebrose h+p://cucumber.io
Smoke tests
h+p://www.seminolecountyfl.gov/core/fileparse.php/3283/urlt/smoke-­‐20test-­‐20image-­‐20.jpg

22. @sebrose h+p://cucumber.io
Non-­‐func5onal tests
h+ps://www.cloudave.com/wp-­‐content/uploads/2014/12/Typhoon.jpg

23. @sebrose h+p://cucumber.io
Manual / exploratory

24. @sebrose h+p://cucumber.io
Test data
h+p://discovermagazine.com/~/media/Images/Issues/2013/December/dragon-­‐science.jpg

25. @sebrose h+p://cucumber.io
Monitoring produc5on
h+p://blogs-­‐images.forbes.com/kashmirhill/files/2014/04/foscam.jpg

26. @sebrose h+p://cucumber.io
<digression>

27. @sebrose h+p://cucumber.io

28. @sebrose h+p://cucumber.io

29. @sebrose h+p://cucumber.io

30. @sebrose h+p://cucumber.io
h+p://quoteinves5gator.com/2012/04/28/shorter-­‐le+er/
“I would have wri/en a
shorter le/er, but I didn’t
have the 6me”

31. @sebrose h+p://cucumber.io
https://estimation.lunarlogic.io/assets/cards-range-8fc41b2e3fd282125f4602a712020204.png

32. @sebrose h+p://cucumber.io
<digression>

33. @sebrose h+p://cucumber.io
Gradual implementa5on

34. @sebrose h+p://cucumber.io
Feature toggles
h+p://ff4j.org/images/console-­‐embedded.png

35. @sebrose h+p://cucumber.io
Branch by abstrac5on
h+p://con5nuousdelivery.com/wp-­‐content/uploads/2011/05/branch_by_abstrac5on.png

36. @sebrose h+p://cucumber.io
Databases
h+p://discovermagazine.com/~/media/Images/Issues/2013/December/dragon-­‐science.jpg

37. @sebrose h+p://cucumber.io
Risk mi5ga5on
-­‐ Blue/green
-­‐ Canary
-­‐ Monitoring

38. @sebrose h+p://cucumber.io
Produc5on like???
h+p://tommcfarlin.com/wp-­‐content/uploads/2014/04/what-­‐does-­‐it-­‐mean.png

39. @sebrose h+p://cucumber.io
Harmonisa5on
homogeneous :
-­‐ uniform in structure or
composi5on throughout

40. @sebrose h+p://cucumber.io
Virtualisa5on and
Containers
h+p://www.informa5on-­‐age.com/sites/default/files/styles/
ar5cle_landscape/public/field/image/shu+erstock_135831281.jpg?
itok=PArqfHMC
h+p://www.adm-­‐compu5ng.co.uk/wp-­‐content/uploads/
2013/06/Virtualisa5on-­‐defined.jpg

41. @sebrose h+p://cucumber.io
Service virtualisa5on
h+p://servicevirtualiza5on.com/blogs/1-­‐1000/910-­‐Screenshot20130520at10.38.46AM.png

42. @sebrose h+p://cucumber.io
Cost
h+p://i.dailymail.co.uk/i/pix/2009/05/13/
ar5cle-­‐1181248-­‐03A99ECD000005DC-­‐78_634x393.jpg

43. @sebrose h+p://cucumber.io
Taming complexity
h+p://boilingfrogs.info/files/2012/05/complexity.jpg

44. @sebrose h+p://cucumber.io
Loose coupling
h+ps://infomgmt.files.wordpress.com/2010/02/coupling-­‐sketches-­‐cropped-­‐1.png

45. @sebrose h+p://cucumber.io
Components
h+p://zoszkoworks.com/wp-­‐content/uploads/2015/01/821-­‐electronic-­‐
components-­‐1920x1080-­‐photography-­‐wallpaper.jpg

46. @sebrose h+p://cucumber.io
h+p://www.slideshare.net/StefSmith/wading-­‐through-­‐treacle-­‐escape-­‐the-­‐integra5on-­‐syrup-­‐
with-­‐contract-­‐tests
CDCs in the pipeline

47. @sebrose h+p://cucumber.io
h+p://mar5nfowler.com/ar5cles/ConsumerDrivenContracts.jpg
CDCs (aka contract tests)

48. @sebrose h+p://cucumber.io
Contract/collabora5on
h+p://www.slideshare.net/nitroduna/behaviour-­‐driven-­‐refactoring-­‐or-­‐im-­‐a-­‐programmer-­‐what-­‐
the-­‐hell-­‐do-­‐i-­‐have-­‐to-­‐test

49. @sebrose h+p://cucumber.io
-­‐ teams own whole stack
-­‐ in-­‐house tools
-­‐ build, deploy, monitor

50. @sebrose h+p://cucumber.io
-­‐ teams own whole stack
-­‐ feature & data toggles
-­‐ con5nuous deployment
-­‐ pioneering MDD
h+ps://youtu.be/bZNzu4UxzPU
h+p://agileonthebeach.com/wp-­‐content/uploads/2015/02/Benji-­‐Webber.pdf

51. @sebrose h+p://cucumber.io
-­‐ using CDCs within pipeline
h+p://www.slideshare.net/StefSmith/wading-­‐through-­‐treacle-­‐escape-­‐the-­‐integra5on-­‐syrup-­‐
with-­‐contract-­‐tests

52. @sebrose h+p://cucumber.io
h+p://agilecambridge.net/2015/sessions/index.php?session=69
A meta-­‐pipeline for genera5ng
con5nuous delivery pipelines for
micro services

53. @sebrose h+p://cucumber.io

54. @sebrose h+p://cucumber.io
http://image.slidesharecdn.com/userstorymappinginpractice-130802183649-phpapp02/95/user-story-
mapping-in-practice-15-638.jpg?cb=1382432108

55. Seb Rose
Twi+er: @sebrose
Blog: www.claysnow.co.uk
E-­‐mail: seb@cucumber.io
Ques5ons?

56. @sebrose h+p://cucumber.io
CoDe:U h+p://www.praqma.com/sites/default/files/img/git_flow_web.pdf