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Testing Network Conditions with ToxiProxy

Avatar for Celso Crivelaro Celso Crivelaro
March 18, 2017
Technology
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83

Testing Network Conditions with ToxiProxy

Talk in Agile Testers Conference - São Paulo, Brazil

Avatar for Celso Crivelaro

Celso Crivelaro

March 18, 2017
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Transcript

  1. Testing network conditions with ToxiProxy Celso Crivelaro @celsocrivelaro

  2. Tech Lead @

  3. Professor @

  4. Past: Monolithic Applications

  5. Today: Distributed Systems

  6. External API Service Server App DB API Mobile Mobile App

    Web App

  7. Share Resources Communication over TCP/IP

  8. Network- dependent Apps

  9. None

  10. https://engineering.riotgames.com/news/fixing-internet-real-time-applications-part-i

  11. None
  12. None
  13. None
  14. None

  15. Network fails

  16. “A Distributed System is one in which the failure of

    a computer you didn’t even know existed can render your own computer unusable” Leslie Lamport
  17. None

  18. Network Model

  19. "Ozzy" Model?

  20. None

  21. 200.124.124.1 200.0.124.5 200.5.34.12 200.3.5.51 200.3.5.52

  22. 200.124.124.1 200.0.124.5 200.5.34.12 200.3.5.51 200.3.5.52 200.124.124.1:80 -> 200.3.5.52:80

  23. Networking Problems

  24. No connection No connection between parts Latency Timeout Bandwidth Slow

    Close Time to packages go and return Stop responding Bandwidth size in Mb/s Slow close connection

  25. What are we testing?

  26. How your app responds to network errors

  27. User perception to network problem Business rule to the problem

    Technical action to the problem

  28. Resiliency

  29. How to simulate?

  30. Hard modify a staging env Hard to automate Low level

    tools -> For sysadmins No APIs for Devs or QA

  31. http://toxiproxy.io

  32. TCP TCP APP SERVICE

  33. TCP TCP APP SERVICE Toxies Latency Bandwidth ...

  34. TCP TCP TCP TCP APP SERVICE 2 SERVICE 1 HTTP

    API
  35. None

  36. How to automate

  37. Some Solutions

  38. Low timeout Retries Patterns - Circuit Break Fallbacks Caching strategies

  39. Resiliency Matrix

  40. App 1 Database API App 2 ZIP Checker External API

    App 3 Unavailable Unavailable Unavailable Unavailable Degraded Available Available Not Aplic. Not Aplic. Unavailable Degraded Degraded If integration fails...

  41. References

  42. None

  43. http://toxiproxy.io

  44. https://engineering.shopify.com/17489072-building-and-testing-resilient-ruby-on-rails-applications

  45. Thank you! @celsocrivelaro Slides in: http://crivelaro.me