1. The document discusses continuous delivery which is the practice of automating the process of shipping code changes to production frequently by integrating testing into the deployment pipeline. 2. It recommends automating acceptance tests, deploying to production whenever code is ready, and having multiple versions deployed to allow quick switching of code. 3. Challenges discussed include the expense of manual operations, fixing requirements, changing environments, and handling hotfixes and rollbacks. The document provides examples of handling schema changes incrementally.

1. Trying'Con*nuous'Delivery
Toru Furukawa!
@torufurukawa!

2. Keep service running
before and after releasing

3. Change,'Change,'Change

4. Ship it as soon as it is ready

5. Con*nuous'delivery
#"Update"the"site"every"5"minutes"
*/5"*"*"*"*"cd"/www/example.com""
""""""""&&"git"pull""
""""""""&&"service"apache"restart"
h5ps://speakerdeck.com/u/zeeg/p/prac*cing>con*nuous>deployment>disqus>pycon>2012

6. Business value

7. 5
Problems

8. 1. Manual operation is
expensive and unpredictable

9. Prefer'scripts'over'opera*ons
$"make"
env".............."build"dev"environment"
unittest"........."run"unit"tests"
acceptancetest"..."run"acceptance"tests"
inspect".........."inspect"codes"
deploy"..........."deploy"to"App"Engine"

10. Automate'acceptance'tests

11. Have'Jenkins'run'tests
Deploy!
Push! Notify!
Pull!
Write codes Unit tests
Unit tests! Acceptance test!

12. 2. Requirements will never be fixed

13. Design product to ship incrementally

14. Schema change
class"User(Model):" class"User(Model):"
""name"="StringProperty()" ""name"="StringProperty()"
""birthday"=" ""birthday"="
""""DateProperty()" """"StringProperty()"
""email"="
""""StringProperty()"

15. Add'new'property
1. Add property with required=False!
2. Deploy!
3. Add app code to read and write new
property!
4. Update index!
5. Deploy!

16. Change property
1. “Add” property with required=False!
2. Deploy!
3. Add app code to access old and new
model!
4. Update index!
5. Deploy!
6. Fill new property (if necessary)!
7. Remove old property!

17. class"User(Model):"
""name"="StringProperty()"
""birthday"="DateProperty()"

18. class"User(Model):"
""name"="StringProperty()"
""date_birthday"="
""""DateProperty(name='birthday')"
""str_birthday"="
""""StringProperty(name='str_birthday’)"

19. class"User(Model):"
""name"="StringProperty()"
""date_birthday"="…"
""str_birthday"="…"
"
""def"get_birthday(self):"
""""return"self.date_birthday"
"
""def"set_birthday(self,"val):"
""""self.date_birthday"="val"
"
""birthday"="property(get_birthday,"
""""""""""""""""""""""set_birthday)"

20. class"User(Model):"
""name"="StringProperty()"
""date_birthday"="…"
""str_birthday"="…"
"
""def"get_birthday(self):"
""""if"self.date_birthday:"
""""""return"self.date_birthday.strftime(…)"
""""else:"
""""""return"self.str_birthday"

21. class"User(Model):"
""name"="db.StringProperty()"
""date_birthday"="…"
""str_birthday"="…"
"
""def"get_birthday(self):"…"
"
""def"set_birthday(self,"val):"
""""if"isinstance(val,"datetime.date):"
""""""val"="val.strftime(…)"
""""""self.date_birthday"="None"
""""self.str_birthday"="val"

22. class"User(Model):"
""name"="db.StringProperty()"
""date_birthday"="…"
""str_birthday"="…"
"
""def"get_birthday(self):"…"
"
""def"set_birthday(self,"val):"…"
"
""birthday"="property(get_birthday,"
""""""""""""""""""""""set_birthday)"

23. 3. Building and changing
environment is expensive

24. Google App Engine
lets us focus on app

25. Make dev and production
environments almost identical
Production
$ appcfg.py update –A myproduction src Server
$ appcfg.py update src
app.yaml Dev Server
$ dev_appserver.py src Local dev
server

26. Have multiple versions deployed to
switch code quickly
$"appcfg.py"–V"v11"update"src"
..."(v11.myapp.appspot.com)"
$"appcfg.py"–V"v11"set_default_version"src"
..."(myapp.appspot.com)"
"

27. 4. We still have problems

28. Hg-flow for hotfix branches
feature
develop
release
hotfix
master
Deploy Deploy

29. Rollback by changing default version
$"appcfg.py"–V"v11"update"src"
..."(v11.myapp.appspot.com)"
$"appcfg.py"–V"v11"set_default_version"src"
"
$"appcfg.py"–V"v10"set_default_version"src"

30. 5. It does not happen overnight

31. Start with what makes sense to you

32. Allocate time for improvement

33. TODOs
• Review!
• Faster feedback!
• Automate capacity tests!
• Manage libraries!
• Test client side app

34. Things got better and
are getting even better

35. Share OUR experiences
@torufurukawa!
http://about.me/torufurukawa!
http://facebook.com/toru.furukawa!