1. continuous delivery
@jezhumble
Berlin, 4 october 2012
http://thoughtworks-studios.com/
Tuesday, October 9, 12

2. agile 101
"Agile" team
Analysis + Design
Centralized QA
IT Operations
Development
Integration + QA
Release and operation
Testing + Showcase
Customer
Iteration
Tuesday, October 9, 12
0
1
2
3
4
The "last mile"

3. social
disrupting traditional businesses
http://code.flickr.com/
Tuesday, October 9, 12

4. releasing frequently
1. build the right thing
Customer
development
Agile product
development
Eric Ries, “The Lean Startup” http://bit.ly/8ZoX5F
Tuesday, October 9, 12

5. innovate
You can't just ask
customers what
they want and then
try to give that to
them.
By the time you get
it built, they'll want
something new.
Steve Jobs
Tuesday, October 9, 12

6. scientific method
Ideas
create hypothesis
deliver minimum
viable product
get feedback
(repeat)
Tuesday, October 9, 12
Learn
Build
Code
Data
Measure
Eric Ries, “The Lean Startup” http://bit.ly/8ZoX5F

7. ask this question
“How long would it take your
organization to deploy a change that
involved just one single line of code? Do
you do this on a repeatable, reliable
basis?”
Mary and Tom Poppendieck, Implementing Lean Software Development, p59.
Tuesday, October 9, 12

8. releasing frequently
1. build the right thing
2. reduce risk of release
John Allspaw: “Ops Metametrics” http://slidesha.re/dsSZIr
Tuesday, October 9, 12

9. optimize for mtrs
Tuesday, October 9, 12

10. optimize for mtrs
MTBF
MTRS
John Allspaw: “Building Resilience in Web Development and Operations”
http://www.usievents.com/en/conferences/8-paris-usi-2011/sessions/968-john-allspaw
Tuesday, October 9, 12

11. releasing frequently
1. build the right thing
2. reduce risk of release
3. real project progress
Tuesday, October 9, 12

12. agile manifesto
Our highest priority is to satisfy
the customer through early and
continuous delivery of
valuable software
Tuesday, October 9, 12

13. production-ready software
Fast, automated feedback on
the production readiness of
your applications every time
there is a change - to code,
infrastructure, or configuration
Tuesday, October 9, 12

14. continuous delivery
Software always production ready
Releases tied to business needs, not
operational constraints
Tuesday, October 9, 12

15. continuous delivery
automation
patterns and practices
collaboration
Tuesday, October 9, 12

16. ingredients
configuration management
continuous integration
automated testing
Tuesday, October 9, 12

17. Develop
Local
Workstation
Mainline Server
Build
pull
Build
Build
push
Tuesday, October 9, 12
✔
Done!

18. Develop
Local
Workstation
Mainline Server
Everyone Commits
Build
To the pull
Mainline
Build
Every Day
Build
push
Tuesday, October 9, 12
✔
Done!

19. build quality in
“Cease dependence on
mass inspection to
achieve quality.
Improve the process
and build quality into
the product in the first
place”
W. Edwards Deming
Tuesday, October 9, 12

20. different kinds of testing
Business facing
Functional acceptance
tests
Showcases
Usability testing
Exploratory testing
Unit tests
Integration tests
System tests
Non-functional
acceptance tests
(performance, scaling, ...)
AUTOMATED
Support programming
MANUAL
MANUAL / AUTOMATED
Critique project
AUTOMATED
Technology facing
Diagram invented by Brian Marick
Tuesday, October 9, 12

21. deployment pipeline
an automated implementation of your
system’s build, deploy, test, release process
visibility
feedback
control
Tuesday, October 9, 12

22. deployment pipeline
Delivery team
Version control
Check in
Build & unit
tests
Automated
acceptance tests
User acceptance
tests
Trigger
Feedback
Check in
Trigger
Trigger
Feedback
Feedback
Check in
Trigger
Feedback
Trigger
Feedback
Approval
Feedback
Tuesday, October 9, 12
Approval
Release

23. deployment pipeline
Tuesday, October 9, 12

24. deployment pipeline
Tuesday, October 9, 12

25. reducing release risk
automate provisioning and deployment
ensure devs, testers and ops collaborate
throughout
Tuesday, October 9, 12

26. reducing release risk
devops
incrementalism
decoupling deployment and release
Tuesday, October 9, 12

27. devops
culture
automation
measurement
sharing
Tuesday, October 9, 12

28. feature toggles
blue-green deployments
canary releases
low risk releases
are incremental
dark launching
production immune system
Tuesday, October 9, 12

29. DEPENDENT SERVICE
1.0
1.1
Database
Abstraction layer
Abstraction layer
STATIC CONTENT
/static/1.1
APPLICATION
/static/1.0
Router /
Load balancer
Interwebs
Tuesday, October 9, 12

30. blue-green
deployments
Tuesday, October 9, 12

31. router
web
server
Tuesday, October 9, 12
app
server
DB
server

32. v1.1
v1.1
v1.1
web
server
app
server
DB
server
router
Tuesday, October 9, 12

33. v1.1
Tuesday, October 9, 12
v1.1
v1.2
v1.2
v1.2
web
server
router
v1.1
app
server
DB
server

34. v1.1
Tuesday, October 9, 12
v1.1
v1.2
v1.2
v1.2
web
server
router
v1.1
app
server
DB
server

35. Canary Releasing
Tuesday, October 9, 12

36. Tuesday, October 9, 12

37. Tuesday, October 9, 12

38. canary releasing
Reduce risk of release
Multi-variant testing
Performance testing
Tuesday, October 9, 12

39. immune system
what if someone replaced your
“buy” button with spacer.gif?
T cells http://www.flickr.com/photos/gehealthcare/3326186490/
Tuesday, October 9, 12

40. release !=
deployment
Tuesday, October 9, 12

41. feature toggles
Config File
[featureToggles]
wobblyFoobars: true
flightyForkHandles: false
some.php
<?if ($wobblyFoobars) {?>
... various UI elements
<?}?>
other.php
$fork_handle = ($featureConfig->isOn(‘flightlyForkHandles)) ?
new flightyForkHander(aCandle) :
new forkHandler(aCandle);
Stolen from Martin Fowler http://martinfowler.com/bliki/FeatureToggle.html
Tuesday, October 9, 12

42. Dark Launching
Tuesday, October 9, 12

43. Tuesday, October 9, 12

44. Tuesday, October 9, 12

45. enterprise governance
risk management
SOX, ITIL, COBIT
segregation of duties
change management
auditing and compliance
Tuesday, October 9, 12

46. people are the key
Get everyone together at the beginning
Keep meeting
Make it easy for everyone to see what’s
happening
Continuous improvement (kaizen)
Tuesday, October 9, 12

47. questions
@jezhumble | jez@thoughtworks.com
http://continuousdelivery.com/
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Tuesday, October 9, 12