Continuous Delivery at GitHub

Presented at Ruby Kaigi 2014.

See also https://speakerdeck.com/matthewmccullough/continuous-delivery-*-a-github-story and the classic (but still relevant) http://zachholman.com/talk/how-github-uses-github-to-build-github/.

Transcript

1. ! Continuous Delivery at GitHub @rsanheim
2. ! @rsanheim
4. ! What is Continuous Delivery?
5. ! Software ready to be deployed at any time
6. ! Why should we care?
7. !
9. ! Besides… Shipping is fun
10. ! Releases and cycle time
11. Releases over one year Release 1 Build Test Deploy Bugs Change Requests Release 2 Build Test, Perf, Scaling Deploy Support Requests Complaints QA Revenue $$
12. Releases over half a year Build Deploy Bugs Issues Team Feedback Build & Scale Deploy Bugs Perf Staff Feedback Build Deploy Bugs Genpop Feedback Polish Deploy Bugs Genpop Feedback Polish Deploy Profit - Done!
13. ! How?
14. ‣ Automation ‣ Tests ‣ Pull Requests ‣ Feature Flags ‣ Chat Ops ‣ Post Deploy
15. ! Automation
16. https://www.flickr.com/photos/nasamarshall/5390879521
17. ! Tests
18. ! SLOC! ! ! ! Directory! ! 60995 test/models! 34526 test/integration! 31106 test/controllers! 25339 test/lib! 12440 test/view_models! 1423 test/jobs! 1029 test/mailers! ! ! ! ruby test loc: 167k! ruby app loc: 158k! ! test / app ratio: 1.06! ! ! generated using David A. Wheeler's 'SLOCCount'
19. ! Pull Requests
20. !
23. ! Feature Flags
24. def live_updates_enabled? logged_in? && current_user.staff? end
25. <% if live_updates_enabled? %> <div class="js-live-update" data-url="<%= live_update_url %>"> <!-- more pull request template code here ... --> </div> <% end %>
26. def live_updates_enabled?! true! end!
27. ! git co master
28. ! Long lived branches are a smell
29. ! Rails 3
30. ! rails3-redux
31. ! rails3-redux master
32. ! ! ! $ RAILS3=true script/bootstrap Bootstrapping the Rails 3 gem environment… ! $ script/bootstrap Bootstrapping the Rails 2 gem environment…
33. ! source "https://rubygems.org" ! def rails3? ENV["RAILS3"] end ! if rails3? gem "rails", "3.0.20.github11" else gem "rails", "2.3.14.github50" gem "actionmailer", "2.3.14.github50" gem "actionpack", "2.3.14.github50" gem "activerecord", "2.3.14.github50" gem "activesupport", "2.3.14.github50" end ! gem "will_paginate", rails3? ? "3.0.3" : "2.3.9.github"
34. ! ! # Disable plugins on Rails 3 GitHub.only_on_rails_3 do config.plugins = [] end ! # Rails 2 needs the session to be configured before initializing GitHub.only_on_rails_2 do require_relative "initializers/session_store" end
35. ! science
36. ! https://github.com/github/dat-science
37. ! require "dat/science" ! class User include Dat::Science ! def can_read?(model) science "user-can-read" do |e| e.context :caller => caller, :login => login e.enabled { self.id % 3 == 0 } e.control { model.readable_by?(user) } # old way e.candidate { self.can?(:read, model) } # new way end end end
38. ! Chat Ops
39. !
40. ! /deploy github/my-feature to production /deploy github/my-feature to branch-lab /deploy github/my-feature to production/fe1,fe2,fe3 /deploy github to production /ci build github/master /queue me for github
42. ! Post deploy
46. ! Done yet?
47. !
49. ! Collect Feedback …and act on it
50. ! Getting started today
51. ! Fin
52. ! More adaptable
53. ! More flexible
54. ! More money
55. ! More fun
56. ! Thank You