Behaviour driven infrastructure
Does Behaviour Driven Development have a role in the infrastructure world? Enter Behaviour Driven Infrastructure where systems administrators can apply some simple open source tools and BDD principles to make infrastructure management more powerful, more insightful and deliver more value to their customers. The typical enterprise monitoring and configuration management set-up for a website is: - Is the Apache package installed and the appropriate version? - Is the Apache service running? - Can I connect to the HTTP port and is HTML returned? - Multiply this by a few hundred iterations of hosts and types of services and you’re probably looking at your typical Nagios, Puppet, Cfengine, Hyperic set-up. All this monitoring misses something critical though – we’re not actually monitoring that the service does what it should. Yes, it matters whether Apache is installed, the Apache service is running, and you can connect to HTTP but does this actually prove anything about the availability of the service we’re managing and providing for our customers? Nope… We need to demonstrate more than just a check that says the Apache server is up. We need to demonstrate that the service delivered by that infrastructure was available to our customers AND functioning as intended. Enter Behaviour Driven Infrastructure or BDI which applies the principles of Behavioural Driven Development to the management of infrastructure. In this presentation you’ll learn: - How Behaviour Driven Development works - What makes a behavioural test - How to install and use Cucumber to perform BDI - Practical examples of behavioural tests in Cucumber, and - How to integrate BDI into your work flow and your enterprise monitoring and configuration management frameworks.
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Behaviour driven infrastructure
- 1. Behaviour Driven Infrastructure Lindsay Holmwood
- 2. DevOps
- 4. Behaviour Driven Infrastructure?
- 5. What is a behavioural test?
- 6. origins
- 8. write test
- 9. write test run test
- 10. write test run test test fails
- 11. write test run test test fails make test pass
- 12. write test run test refactor test fails make test pass
- 13. unit tests
- 14. input/output of functions
- 15. result = bar(foo) assert(result, true)
- 16. xUnit
- 18. Behavior Driven Development a reaction to test focus
- 19. testing the flow of data in a system
- 20. test a user can perform a task
- 21. make a donation search for product checkout cart
- 22. verifying a business’s functional requirements are met
- 23. underlying implementation is irrelevant to the business
- 26. Business: “Can I search for things?” Tech: “Yes” Business: “Great”
- 28. implementation is not
- 30. verifying a business’s functional requirements are met
- 35. so the business understands what it is paying for
- 37. Enough business touchy-feely mumbo jumbo!
- 38. I thought this was a Behaviour Driven Infrastructure talk?
- 39. I thought this was a Behaviour Driven Infrastructure talk?
- 42. “The ‘Infrastructure’ is an application, a long running process with inputs, outputs and state.” - Andrew Schafer, 2009 http://bit.ly/he3HBt
- 43. an abstraction
- 44. infrastructure is the application
- 45. daemons are the libraries
- 46. configuration management is the programming language
- 47. infrastructure is built with code
- 48. code without tests is bad
- 49. code without tests evil is
- 50. Why?
- 51. You can’t verify that your system works.
- 53. Behaviour Driven Infrastructure
- 54. Taking BDD principals & tools
- 55. Adapting them to infrastructure development
- 57. Show me the tools!
- 58. Cucumber
- 59. Executable format for software specifications
- 60. Tool to execute that specification
- 62. Terminology
- 63. feature is a module of common functionality
- 64. Feature: Google search To increase her knowledge A user Needs a search interface To discover information
- 66. Feature: Google search To increase her knowledge A user Needs a search interface To discover information Scenario: Home page When I visit "http://google.com.au/" And I fill in "q" with "great balls of fire" Then I should see "great balls of fire"
- 68. Given
- 69. When
- 70. Then
- 71. And*
- 73. steps are like unit tests
- 74. they map to blocks of code
- 75. Feature: Google search To increase her knowledge A user Needs a search interface To discover information Scenario: Home page When I visit "http://google.com.au/" And I fill in "q" with "great balls of fire" Then I should see "great balls of fire"
- 76. When /^I visit "([^"]*)"$/ do |location| # code end When /^I fill in "([^"]*)" with "([^"]*)"$/ do |input, value| # code end Then /^I should see "([^"]*)"$/ do |string| # code end
- 77. When /^I visit "([^"]*)"$/ do |location| visit(location) end When /^I fill in "([^"]*)" with "([^"]*)"$/ do |input, value| fill_in(input, :with => value) end Then /^I should see "([^"]*)"$/ do |string| response.body.should match(string) end
- 78. blocks of code are like unit tests
- 79. ∴ scenario is a serial execution of unit tests
- 81. Installing
- 82. $ apt-get install rubygems $ gem install cucumber
- 83. Using
- 84. $ apt-get install rubygems $ gem install cucumber
- 85. $ apt-get install rubygems $ gem install cucumber $ mkdir -p project/features/steps $ cd project
- 86. Testing Workflow
- 87. write test
- 88. write test run test
- 89. write test run test test fails
- 90. write test run test test fails make test pass
- 91. write test run test refactor test fails make test pass
- 92. $ apt-get install rubygems $ gem install cucumber $ mkdir -p project/features/steps $ cd project $ vim features/site.feature
- 93. Feature: Google search To increase her knowledge A user Needs a search interface To discover information Scenario: Home page When I visit "http://google.com.au/" And I fill in "q" with "great balls of fire" Then I should see "great balls of fire"
- 94. $ apt-get install rubygems $ gem install cucumber $ mkdir -p project/features/steps $ cd project $ vim features/site.feature $ cucumber features/site.feature $ vim features/steps/site_steps.rb
- 95. $ apt-get install rubygems $ gem install cucumber $ mkdir -p project/features/steps $ cd project $ vim features/site.feature $ cucumber features/site.feature $ vim features/steps/site_steps.rb $ cucumber features/site.feature
- 97. Implications
- 100. Execute tests on commit to config management
- 101. What environments are the tests run against?
- 103. Destructive tests?
- 104. Fixtures
- 105. Setup / Teardown Pattern
- 106. A/B testing
- 110. Continuous Integration & Monitoring Systems
- 111. build deploy notify test
- 112. build deploy notify test
- 113. notify test
- 114. We’ve been asking the wrong questions
- 115. ping connect
- 116. is the host up? is the service available?
- 117. n etwork s tack up other w is e broken but is the host up? is the service available? misconfiguration, bugs trig gere d by user data, hacke d
- 119. Why should I care?
- 120. “Nagios checks already do this!”
- 121. Cucumber provides a framework to phrase questions
- 122. Given
- 123. When
- 124. Then
- 125. Lowers the barrier of entry to writing good checks
- 126. Caveat: You need a firm grasp of language
- 127. Feature: Candy Store Wooooooooo! Scenario: Lollipops When I fly to the moon Then I should see monkeys
- 128. Feature: Candy Store Wooooooooo! Scenario: Lollipops When I fly to the moon Then I should see monkeys o mpletely vali d, c co mpletely useless
- 130. Cucumber provides a common specification format dev & ops can share
- 131. Cucumber provides a common specification format IT & business can share
- 132. Duplication of tests
- 133. Development
- 134. Production
- 135. Cucumber features are librarised tests
- 136. Same specification
- 139. Where to from here?
- 140. Write more code.
- 141. Patterns.
- 142. Expand the library of tests.
- 143. Explain to your friends, colleagues, family, pets these ideas.
- 144. Discuss! Thank you.