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Continuous Integration
  The Minimum Viable Product
     Julian Simpson - @builddoctor
           Chris Read - @cread
http://www.flickr.com/photos/84889127@N00/5151115063/



Where’s Chris?
http://www.flickr.com/photos/brook/50700239/




Loom? Really?
http://www.flickr.com/photos/sarah_elizabeth_simpson/5923553033/
http://www.flickr.com/photos/krunkwerke/5304623530
http://www.flickr.com/photos/imlsdcc/5576596277/
http://www.flickr.com/photos/mainmanwalkin/3074193461/




mainline

                                             release
                                             branches
http://www.flickr.com/photos/redarrow101/1338479041/
CI Principles
CI Principles
• Build and test everything, when it changes
CI Principles
• Build and test everything, when it changes
• The database schema counts as everything
CI Principles
• Build and test everything, when it changes
• The database schema counts as everything
• Tests count as everything
CI Principles
• Build and test everything, when it changes
• The database schema counts as everything
• Tests count as everything
• And JavaScript
CI Principles
• Build and test everything, when it changes
• The database schema counts as everything
• Tests count as everything
• And JavaScript
• Check in often and early
CI Principles
• Build and test everything, when it changes
• The database schema counts as everything
• Tests count as everything
• And JavaScript
• Check in often and early
• Builds are feedback
Simple CI Demo
More build information
Databases
Databases

• Use database migrations
Databases

• Use database migrations
• Don’t write your own tool
Databases

• Use database migrations
• Don’t write your own tool
• Don’t mix DDL and DML
Databases

• Use database migrations
• Don’t write your own tool
• Don’t mix DDL and DML
• Data can cause migrations to fail in prod
1 class CreateTheGems < ActiveRecord::Migration
 2   def self.up
 3     create_table :the_gems do |t|
 4       t.string :name
 5       t.timestamps
 6     end
 7   end
 8
 9   def self.down
10     drop_table :the_gems
11   end
12 end
1 class AddGemStatus < ActiveRecord::Migration
2   def self.up
3     add_column :the_gems, :status, :string, :default => "pending"
## at least there are 3 values. pending, declined & approved
4   end
5
6   def self.down
7     remove_column :the_gems, :status
8   end
9 end
Notifications
Notifications

• Email is evil
Notifications

• Email is evil
• IDE or tray tools are OK
Notifications

• Email is evil
• IDE or tray tools are OK
• Big Visible tools are awesome
XFD Demo
Scaling
Scaling

• Solid State Disks are your friend
Scaling

• Solid State Disks are your friend
• Scaling tests is a different concern: http://
  test-load-balancer.github.com/
Scaling

• Solid State Disks are your friend
• Scaling tests is a different concern: http://
  test-load-balancer.github.com/
• Don’t fake infrastructure to make it fast
Testing the Web
Testing the Web

• You can make your application easier to
  test
Testing the Web

• You can make your application easier to
  test
• Don’t forget to test everything
Testing the Web

• You can make your application easier to
  test
• Don’t forget to test everything
• Be damn careful when you parallelize tests
If you can’t test them,
     validate them
Though testing is
    better
GUI



  Acceptance



Unit/Integration
Sauce Labs Demo
DevOps




http://www.flickr.com/photos/shaggypaul/193098324/
DevOps

• most misunderstood meme of recent times




         http://www.flickr.com/photos/shaggypaul/193098324/
DevOps

• most misunderstood meme of recent times
• agile approach to systems admin



         http://www.flickr.com/photos/shaggypaul/193098324/
DevOps

• most misunderstood meme of recent times
• agile approach to systems admin
• developer-sysadmin collaboration


         http://www.flickr.com/photos/shaggypaul/193098324/
DevOps

• most misunderstood meme of recent times
• agile approach to systems admin
• developer-sysadmin collaboration
• provides feedback to the business

         http://www.flickr.com/photos/shaggypaul/193098324/
Production
Production

• Deployment scripts should be rehearsed in
  CI
Production

• Deployment scripts should be rehearsed in
  CI
• CI servers should be built the same way as
  prod
Production

• Deployment scripts should be rehearsed in
  CI
• CI servers should be built the same way as
  prod
• Tools like Puppet and Chef help you do
  that
Puppet Demo
New server: 45 seconds
knox:infrastructure jsimpson$
rake puppet:remote
bundle exec lib/instance.rb
Node ready at 44.457065
bootstrapping at 44.457127
setting the ssh hostkey at 44.457141
copying the code over at 44.828861
about to make code dir at 44.828986
About to rsync at 45.731777
Slowest part? My ISP
Rsync done at 327.996322
bootstrapping rubygems at 327.997617

updating system config
Extracting templates from packages: 100%
Successfully installed bundler-1.0.15
1 gem installed
Building native extensions. This could
take a while...
Successfully installed json-1.5.3
1 gem installed

bootstrapped rubygems at 366.733525
bootstrapping at 366.733569
bootstrapped at 366.733608
bootstrapped at 373.198161
Continuous
Deployment
http://www.flickr.com/photos/rsgranne/179321532/




Continuous Delivery

 ... satisfy the customer through early
 and continuous delivery of
 valuable software ... (ask Jez)
Further reading
Thank you

     Any Questions?
      @builddoctor
julian@build-doctor.com

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Continuous Integration, the minimum viable product

Editor's Notes

  1. Explain that chris is not an imaginary friend\nDo the experience check\nExplain the vagueness in pitching\nask them to ask questions\nexplai\n \n\n\n
  2. Explain Chris\nDo the experience check\nAsk for questions\nTake a deep fucking breath\n\n
  3. This is the existing metaphor for CI\n&amp;#x201C;Toyoda&amp;#x2019;s automatic loom stopped whenever the thread of the warp was snapped, .. the loom could not produce defectives, because it had an automatic stopping device&amp;#x201D;\nBut CI is not about machines, it&amp;#x2019;s about peopl;e\n
  4. \n
  5. This is CM done wrong\n
  6. Which leads to this\n
  7. it should be this\n
  8. The 1840&amp;#x2019;s called, they want your CI status back\n
  9. 1. CI Principles\nBuild everything, whenever it changes\nSingle Source of Truth\nthe database schema counts as everything\nthe tests count as everything\nCheck in frequently\nWe all build together (ie Branching is Bad!)\nFEEDBACK!\n\n
  10. 1. CI Principles\nBuild everything, whenever it changes\nSingle Source of Truth\nthe database schema counts as everything\nthe tests count as everything\nCheck in frequently\nWe all build together (ie Branching is Bad!)\nFEEDBACK!\n\n
  11. 1. CI Principles\nBuild everything, whenever it changes\nSingle Source of Truth\nthe database schema counts as everything\nthe tests count as everything\nCheck in frequently\nWe all build together (ie Branching is Bad!)\nFEEDBACK!\n\n
  12. 1. CI Principles\nBuild everything, whenever it changes\nSingle Source of Truth\nthe database schema counts as everything\nthe tests count as everything\nCheck in frequently\nWe all build together (ie Branching is Bad!)\nFEEDBACK!\n\n
  13. 1. CI Principles\nBuild everything, whenever it changes\nSingle Source of Truth\nthe database schema counts as everything\nthe tests count as everything\nCheck in frequently\nWe all build together (ie Branching is Bad!)\nFEEDBACK!\n\n
  14. 1. CI Principles\nBuild everything, whenever it changes\nSingle Source of Truth\nthe database schema counts as everything\nthe tests count as everything\nCheck in frequently\nWe all build together (ie Branching is Bad!)\nFEEDBACK!\n\n
  15. \n
  16. \n
  17. AR migrations, dbdeploy, dbdeploy.net, tarantino, dbmigrate, et al\nDML and DDL must never meet\nReference data may depend on a schema\ntest it realistically - test against a real dataset if you can\n\n \n\n
  18. AR migrations, dbdeploy, dbdeploy.net, tarantino, dbmigrate, et al\nDML and DDL must never meet\nReference data may depend on a schema\ntest it realistically - test against a real dataset if you can\n\n \n\n
  19. AR migrations, dbdeploy, dbdeploy.net, tarantino, dbmigrate, et al\nDML and DDL must never meet\nReference data may depend on a schema\ntest it realistically - test against a real dataset if you can\n\n \n\n
  20. AR migrations, dbdeploy, dbdeploy.net, tarantino, dbmigrate, et al\nDML and DDL must never meet\nReference data may depend on a schema\ntest it realistically - test against a real dataset if you can\n\n \n\n
  21. \n
  22. \n
  23. Don&amp;#x2019;t use email\nIf you use IDE or desktop widgets\nYou need to communicate the state to all\n\n\n
  24. Don&amp;#x2019;t use email\nIf you use IDE or desktop widgets\nYou need to communicate the state to all\n\n\n
  25. Don&amp;#x2019;t use email\nIf you use IDE or desktop widgets\nYou need to communicate the state to all\n\n\n
  26. \n
  27. \n\nNext is scaling your tests (Jules can allude to his current client on this one...)\n\nScaling your CI infrastructure:\n\nAOL incident \n\nAfter that you need to make sure your software can scale in production (twitter...) you can \n\nThen comes the feedback loop of testing scaling, and making sure that your test environment reflects all the moving parts of production accurately enough without trying to match the scale...\n\n
  28. \n\nNext is scaling your tests (Jules can allude to his current client on this one...)\n\nScaling your CI infrastructure:\n\nAOL incident \n\nAfter that you need to make sure your software can scale in production (twitter...) you can \n\nThen comes the feedback loop of testing scaling, and making sure that your test environment reflects all the moving parts of production accurately enough without trying to match the scale...\n\n
  29. \n\nNext is scaling your tests (Jules can allude to his current client on this one...)\n\nScaling your CI infrastructure:\n\nAOL incident \n\nAfter that you need to make sure your software can scale in production (twitter...) you can \n\nThen comes the feedback loop of testing scaling, and making sure that your test environment reflects all the moving parts of production accurately enough without trying to match the scale...\n\n
  30. Web application testing is a core driver of CI pain\n
  31. Web application testing is a core driver of CI pain\n
  32. Web application testing is a core driver of CI pain\n
  33. \n
  34. \n
  35. Key message. Have this proportion of tests.\nYou might not use the same tools for each tier\nA tool for testing the DOM is not a general purpose testing tool\nYou can make your application easier to test by disabling GUI features (e.g. ads, painful ajax interactions)\nGUI tests ideally will take a slice of functionality rather than logging in, testing and logging out.\nMost CI builds are slow because of GUI tests.\nParallelizing GUI tests is dangerous unless you attempt to optimise first\nSome browsers are assloads slower than others\n\n\n\n\n\n\n
  36. \n
  37. \n
  38. You&amp;#x2019;re not a bloody devop\nThese are the people who didn&amp;#x2019;t want to be left behind\nCollaboration is #1\nPimp our other talk\n
  39. You&amp;#x2019;re not a bloody devop\nThese are the people who didn&amp;#x2019;t want to be left behind\nCollaboration is #1\nPimp our other talk\n
  40. You&amp;#x2019;re not a bloody devop\nThese are the people who didn&amp;#x2019;t want to be left behind\nCollaboration is #1\nPimp our other talk\n
  41. You&amp;#x2019;re not a bloody devop\nThese are the people who didn&amp;#x2019;t want to be left behind\nCollaboration is #1\nPimp our other talk\n
  42. The ultimate scaling - production\n\nThere is a lot we can talk about here about actually getting code in to production. Simple stuff like making sure your deployment scripts are treated as the top level code it is and tested accordingly...\n
  43. The ultimate scaling - production\n\nThere is a lot we can talk about here about actually getting code in to production. Simple stuff like making sure your deployment scripts are treated as the top level code it is and tested accordingly...\n
  44. The ultimate scaling - production\n\nThere is a lot we can talk about here about actually getting code in to production. Simple stuff like making sure your deployment scripts are treated as the top level code it is and tested accordingly...\n
  45. \n
  46. \n
  47. \n
  48. \n
  49. \n
  50. Demo of the build pipeline plugin\nVery engineer-focused approach\nSetting up the CD system is easy, retro-fitting all the tests to your app: hard\nNo excuse not to deploy all the time to staging systems\n\n\n
  51. Focus on driving down cycle time\nGreater emphasis on app releases\nUsing all of the pluming of CD\nYou&amp;#x2019;re only done when you&amp;#x2019;re in prod\nvenn diagram?\nsits on pillars of previous\n
  52. \n
  53. \n