This document summarizes a presentation given at RedDotRubyConf 2013 about continuously upgrading a legacy Rails application to newer versions of Ruby and Rails. It discusses the challenges faced such as compatibility issues, testing to prevent regressions, and deploying updates without downtime. Continuous integration, staging environments, monitoring and alerts were used to safely upgrade the application from Ruby 1.8.6 and Rails 2.0.2 to Ruby 2.0 and Rails 3.2 over time.

1. 柴田 博志
SHIBATA Hiroshi
paperboy&co.
asakusa.rb
paperboy&co., Inc.
Continuous Upgrades For Rails Apps.
発表場所 RedDotRubyConf 2013 2013-06-08(Sat)
From 'Legacy'
to 'Edge'

3. self

4. SHIBATA Hiroshi(@hsbt)

5. Rails Girls in Japan

6. asakusa.rb

7. asakusa.rb
takoyaki!

8. asakusa.rb

9. Ruby Committer

10. Great News

11. ruby/www.ruby-lang.org

12. Please join us

13. http://bugs.ruby-lang.org

14. asakusarb/redmine4ruby-lang

18. http://30d.jp

19. from 2007/5

20. 280,000 users
174,000,000 photos

21. Our Rails app
44models
9000lines in controllers
220lines in routes.rb

22. system architecture

23. application server

24. storage api server

25. storage server

26. customer management

27. storage is over
400TB

28. Ruby 1.8.6
Rails 2.0.2

29. Rails in Kansas

30. Rails in Tokyo

31. Ruby 1.8.6
Rails 2.0.2
Ruby 2.0.0
Rails 3.2.13

32. RubyRubyRubyRuby
1.8.6 1.8.7 1.9 2.0
Rails
2.0/2.1
Rails
2.3
Rails
3.0
Rails
3.2

33. RubyRubyRubyRuby
1.8.6 1.8.7 1.9 2.0
Rails
2.0/2.1
Rails
2.3
Rails
3.0
Rails
3.2

34. RubyRubyRubyRuby
1.8.6 1.8.7 1.9 2.0
Rails
2.0/2.1
Rails
2.3
Rails
3.0
Rails
3.2

35. How to migrate
edge rails
from
legacy rails?

36. Test to specify

37. Continuous Integration

38. staging environment

39. puppet

40. 1-8
deploy/day

41. Rails 2.0
Rails 2.3

42. Rails 2.0
Rails 2.3
hotfix A
migration A

43. Rails 2.0
Rails 2.3
hotfix A
migration A

44. Rails 2.0
Rails 2.3
hotfix A
migration A

45. offensive
system
operation

46. Zero
Downtime
Deploy

47. app1
app2

48. should not
use slave-read
in database
caution

49. the basic of slave-read

51. cookpad/kage

52. Kage (kah-geh) is an HTTP shadow
proxy server that sits between
clients and your server(s) to
enable "shadow requests".

53. the basic of kage
real request

54. Kage::ProxyServer.start do |server|
config = YAML.load_file(File.expand_path("../config.yml",
__FILE__))[ENV['RAILS_ENV']]
server.port = 8090
server.host = config[:host]
server.debug = false
# backends can share the same host/port
server.add_master_backend(:production, config[:production], 8080)
server.add_backend(:sandbox, config[:sandbox], 80)
server.client_timeout = 15
server.backend_timeout = 10
# Dispatch all GET requests to multiple backends, otherwise
only :production
server.on_select_backends do |request, headers|
if request[:method] == 'GET' && rand(9) == 0
[:production, :sandbox]
else
[:production]
end
end
end

55. hsbt/puppet-kage

57. app1
app2

58. monitoring
and
alerting

59. newrelic

60. nagios

61. exception_notification

62. IRC
github issue
costomer’s
contact
nagios

63. munin

64. people

65. newcomer bootcamp
sergeantsergeant
sergeant

66. github and github:e

67. webistrano

69. confusion of programmer
is
causes of low productivity

70. RubyRubyRubyRuby
1.8.6 1.8.7 1.9 2.0
Rails
2.0/2.1
Rails
2.3
Rails
3.0
Rails
3.2
always on the edge
is
motivating

71. Ruby 1.8.7
Rails 2.3.18
Ruby 1.8.7
Rails 3.0.20

72. rails 2.3 with bundler

73. source 'https://rubygems.org'
gem 'rails', '~> 2.3.18'
gem 'rake', '~> 0.9.2'
gem 'rdoc'
gem 'rake-confirm'
gem 'mysql'
gem "mysql_retry_lost_connection"
gem 'acts_as_paranoid', :github => 'paperboy-30days/acts_as_paranoid'
gem 'passenger', '~> 3.0'
gem 'memcache-client', :require => 'memcache'
gem 'system_timer'
gem 'yajl-ruby', :require => 'yajl'
gem 'will_paginate', '~> 2.3'
gem 'mail'
gem 'sass'
gem 'compass-rails'
gem 'osaipo_client', :git => 'git@github.com:paperboy-all/
osaipo_client.git', :branch => 'legacy'
gem 'jugem_client', :git => 'git@github.com:paperboy-all/
jugem_client.git'
gem 'ppb_footer', :github => 'paperboy-all/ppb_footer'

74. require "./config/environment"
use Rails::Rack::LogTailer
use Rails::Rack::Static
run ActionController::Dispatcher.new
rack with rails 2.3

75. rails_upgrade plugin

76. 30days-front
can’t use
hyphen
can’t use
number
can’t convert
application.rb...

77. conclusion

78. RubyRubyRubyRuby
1.8.6 1.8.7 1.9 2.0
Rails
2.0/2.1
Rails
2.3
Rails
3.0
Rails
3.2

79. high productivity

80. Let’s enjoy
around
legacy system!!