Continuous Delivery at GitHub

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! Continuous Delivery at GitHub @rsanheim

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! @rsanheim

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! What is Continuous Delivery?

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! Software ready to be deployed at any time

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! Why should we care?

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! Besides… Shipping is fun

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! Releases and cycle time

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Releases over one year Release 1 Build Test Deploy Bugs Change Requests Release 2 Build Test, Perf, Scaling Deploy Support Requests Complaints QA Revenue $$

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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!

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! How?

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‣ Automation ‣ Tests ‣ Pull Requests ‣ Feature Flags ‣ Chat Ops ‣ Post Deploy

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! Automation

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https://www.ﬂickr.com/photos/nasamarshall/5390879521

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! Tests

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! 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'

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! Pull Requests

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! Feature Flags

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def live_updates_enabled? logged_in? && current_user.staff? end

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<% if live_updates_enabled? %>

<% end %>

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def live_updates_enabled?! true! end!

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! git co master

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! Long lived branches are a smell

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! Rails 3

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! rails3-redux

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! rails3-redux master

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! ! ! $ RAILS3=true script/bootstrap Bootstrapping the Rails 3 gem environment… ! $ script/bootstrap Bootstrapping the Rails 2 gem environment…

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! 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"

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! ! # 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

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! science

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! https://github.com/github/dat-science

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! 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

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! Chat Ops

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! /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