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

Keep service running
before and after releasing

Change,'Change,'Change

Ship it as soon as it is ready

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

Business value

5
Problems

1. Manual operation is
expensive and unpredictable

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"

Automate'acceptance'tests

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

2. Requirements will never be fixed

Design product to ship incrementally

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

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!

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!

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

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

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)"

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"

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"

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)"

3. Building and changing
environment is expensive

Google App Engine
lets us focus on app

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

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)"
"

4. We still have problems

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

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"

5. It does not happen overnight

Start with what makes sense to you

Allocate time for improvement

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

Things got better and
are getting even better

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