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Testing Network Conditions with ToxiProxy
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Celso Crivelaro
March 18, 2017
Technology
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Testing Network Conditions with ToxiProxy
Talk in Agile Testers Conference 2017 - SP
Celso Crivelaro
March 18, 2017
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Transcript
Testing network conditions with ToxiProxy Celso Crivelaro @celsocrivelaro
Tech Lead @
Professor @
Past: Monolithic Applications
Today: Distributed Systems
External API Service Server App DB API Mobile Mobile App
Web App
Share Resources Communication over TCP/IP
Network- dependent Apps
None
https://engineering.riotgames.com/news/fixing-internet-real-time-applications-part-i
None
None
None
None
Network fails
“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
None
Network Model
"Ozzy" Model?
None
200.124.124.1 200.0.124.5 200.5.34.12 200.3.5.51 200.3.5.52
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
Networking Problems
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
What are we testing?
How your app responds to network errors
User perception to network problem Business rule to the problem
Technical action to the problem
Resiliency
How to simulate?
Hard modify a staging env Hard to automate Low level
tools -> For sysadmins No APIs for Devs or QA
http://toxiproxy.io
TCP TCP APP SERVICE
TCP TCP APP SERVICE Toxies Latency Bandwidth ...
TCP TCP TCP TCP APP SERVICE 2 SERVICE 1 HTTP
API
None
How to automate
Some Solutions
Low timeout Retries Patterns - Circuit Break Fallbacks Caching strategies
Resiliency Matrix
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...
References
None
http://toxiproxy.io
https://engineering.shopify.com/17489072-building-and-testing-resilient-ruby-on-rails-applications
Thank you! @celsocrivelaro Slides in: http://crivelaro.me