Can you release a new version of your product right now? This version includes everything which is under your version control? We don’t have to be hypocrite, answer yes to these two questions is not easy. In this lecture I’m going to talk about my journey in Continuous Delivery where I’ve find the fear as the biggest smell in its adoption.

1. Overcoming the fear of
deployments
by @andreitognolo

3. As we grow up,
we're often encouraged to think of fear as a weakness,
just another childish thing to discard (…)
Karen Thompson Walker [1]

4. Shelly Kagan [2]
SOMETHING BAD
3 Conditions

5. SOMETHING BAD
3 Conditions
NON-NEGLIGIBLE
CHANCE
0% 100%
Shelly Kagan [2]

6. SOMETHING BAD
3 Conditions
NON-NEGLIGIBLE
CHANCE
SOME
UNCERTAINTY
0% 100%
Shelly Kagan [2]

7. SOMETHING BAD
3 Conditions
NON-NEGLIGIBLE
CHANCE
SOME
UNCERTAINTY
0% 100%
(something that you care)
(something unpredictable)
Shelly Kagan [2]

8. (un)predictability
Is it possible to have a completely predictable
deployment process?

9. (un)predictability

10. (un)predictability

11. Construct a house
(un)predictability
Cynefin Framework [3]
(COMPLICATED)
cause and effect
requires analysis

12. Construct a house Create software
(un)predictability
(COMPLICATED) (COMPLEX) (*)
cause and effect can
only be perceived in
retrospect, but not in
advance
cause and effect
requires analysis
Cynefin Framework [3]
(*) Software development is not
only made of complex activities

13. Construct a house Create software
(un)predictability
(COMPLICATED)
Require tests after!
cause and effect can
only be perceived in
retrospect, but not in
advance
cause and effect
requires analysis
Cynefin Framework [3]
(*) Software development is not
only made of complex activities
(COMPLEX) (*)

14. (un)predictability
Is it possible to have a completely predictable
deployment process?

15. (un)predictability
Is it possible to have a completely predictable
deployment process?
Not completely predictable

16. (un)predictability
Is it possible to have a completely predictable
deployment process?
Not completely predictable
Some fear makes sense

17. The amount of fear should be appropriate
to the size of "the bad"
How much fear?

18. Worst thing possible
Requestspersecond

19. Worst thing possible
Requestspersecond
Deploy

20. Requestspersecond
Worst thing possible
Deploy

21. Worst thing possible
deploy
new version
Make it
available
(avoiding)

22. Worst thing possible
deploy
new version
Make it
available
smoke
test
(avoiding)

23. A really bad thing
run
builds

24. A really bad thing
run
builds

25. A really bad thing
run
builds
build
logs

26. A really bad thing
run
builds
build
logs
tail
logs

27. A really bad thing
TestPyramid
Martin Fowler [4]
(avoiding)

28. You can’t predict everything
ps: I don’t like gambling
+ > 5

29. You can’t predict everything
ps: I don’t like gambling
Are you afraid of betting € 10,000?
+ > 5

30. You can’t predict everything
One after the
After the first result,
you can give up and lose € 1,000
ps: I don’t like gambling
(avoiding)

31. You can’t predict everything
(avoiding)

32. You can’t predict everything
FEATURE TOGGLE
if toggle on {
new code
} else {
old code
}
(avoiding)

33. You can’t predict everything
FEATURE TOGGLE
(avoiding)
if toggle on {
new code
} else {
old code
}

34. What is the cause?
Create software
(COMPLEX)
cause and effect can
only be perceived in
retrospect, but not in
advance

35. What is the cause?
07fc5cb Add ability to ...
1c6a8fb Refactor database
79b83c6 Remove unused ...
657fdea Add migration ...
07537c2 Change signature ..
6b7a12d Improve ajax ...
7bffaa4 Add stylesheet ...
ce9676d Add dependency ...
cb9b60b Change nginx ...
3311736 Remove duplicated .

36. What is the cause?
May 2015 [5]

37. What is the cause?
master
my-branch
merge
deploy

38. What is the cause?
master
deploys
(avoiding)
TRUNK BASED DEVELOPMENT

39. What is the cause?
master
deploys
Feature Toggle
(avoiding)
TRUNK BASED DEVELOPMENT
deployment != release

40. What is the cause?
79b83c6 Remove unused ...
master
(avoiding)

41. What is the cause?
master
deploys
If it hurts, do it more often
If you are afraid, do it more often
(avoiding)

42. Culture

43. Culture
If people are afraid to get blamed, they will usually hide
problems, at the risk of creating even bigger problems.
Highly unhealthy.
Blog post link [6]

44. Culture
Development
Team
Operations
Team
It’s your fault!
No, it’s your fault!

45. Culture
It’s our responsibility!
DevOps Culture

46. Takeaway List

47. Takeaway List

48. Don’t be afraid to be afraid :)
Takeaway List

49. Thank you!
@andreitognolo
github.com/andreitognolo
andreitognolo@gmail.com

50. [1] https://www.ted.com/talks/karen_thompson_walker_what_fear_can_teach_us
[2] http://oyc.yale.edu/philosophy/phil-176/lecture-22
[3] https://en.wikipedia.org/wiki/Cynefin_Framework
[4] http://martinfowler.com/bliki/TestPyramid.html
[5] https://www.thoughtworks.com/radar/techniques/long-lived-branches-with-gitflow
[6] http://tech.transferwise.com/blameless-postmortems/
References