Testing Network Conditions with ToxiProxy

Talk in Agile Testers Conference - São Paulo, Brazil

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
10. https://engineering.riotgames.com/news/fixing-internet-real-time-applications-part-i
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
18. Network Model
19. "Ozzy" Model?
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
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
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