This document discusses the principles and benefits of chaos engineering. It describes how Netflix introduced the concept of the "Chaos Monkey" to intentionally fail components to test system resilience. Chaos engineering helps identify weaknesses by exposing systems to different types of failures and limiting undetected issues. The document outlines three key lessons: trust that systems can withstand failures, fixing one problem may introduce new issues, and having a culture that embraces chaos is difficult but important for reliability. It recommends companies start with controlled chaos experiments and game days to build experience handling failures.

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CHAOS PATTERNS
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LESSONS ABOUT FAILING WELL AND FAILING OFTEN

2. FAILURE HAPPENS
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3. “EVERYTHING FAILS ALL THE TIME”
-WERNER VOGELS, CTO, AMAZON WEB SERVICES
HTTP://THENEXTWEB.COM/2008/04/04/WERNER-VOGELS-EVERYTHING-FAILS-ALL-THE-TIME/
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4. THE ORIGINAL CHAOS MONKEY
CREATED BY NETFLIX CLOUD ARCHITECT, GREG ORZELL - @CHAOSSIMIA 2010
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HTTPS://WWW.LINKEDIN.COM/IN/GORZELL

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A STATE OF XEN
AWS EC2 REBOOT, 2014
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6. HTTP://XENBITS.XEN.ORG/XSA/ADVISORY-108.HTML
HTTP://TECHBLOG.NETFLIX.COM/2014/10/A-STATE-OF-XEN-CHAOS-MONKEY-CASSANDRA.HTML
HTTP://AWS.AMAZON.COM/BLOGS/AWS/EC2-MAINTENANCE-UPDATE/
22COMPLETE NODE FAILURE
2700+ C* NODES, 218 REBOOTS
0DOWNTIME
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7. LESSON #1 : TRUST YOUR RESILIENCE
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8. SLOW IS HARD
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9. SLOW IS HARD
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10. UNBOUND QUEUES - ELASTIC ISN’T INFINITE
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11. UNBOUND QUEUES - ELASTIC ISN’T INFINITE
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12. SLOW IS HARD
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13. LATENCY MONKEY
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14. SLOW IS HARD
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15. LATENCY TESTING 2.0 - FIT
HTTP://TECHBLOG.NETFLIX.COM/2014/10/FIT-FAILURE-INJECTION-TESTING.HTML
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16. SLOW IS HARD
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17. SLOW IS HARD
START SLOW
•ACCOUNT LEVEL
•+10MS BEFORE +100MS
•+1% ERRORS BEFORE +80%
ERRORS
DIAL IT UP
•A -> D NOT * -> D
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18. LESSON # 2 : FIXING ONE FAILURE MODE
EXPOSES NEW ONES
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19. WHATS SO SPECIAL ABOUT CHAOS
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CHAOS IS A CHOICE

20. WHATS SO SPECIAL ABOUT CHAOS
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OUTAGES VS CHAOS

21. BRUCE M. WONG | @BRUCE_M_WONG
OUTAGES VS CHAOS
Uncontrolled Controlled
Unpredictable Scheduled
Time to Detect: Minutes 0 Time to Detect
Time to Resolve: ???? Time to Resolve: seconds*
Analysis Time: ???? Root Cause Analysis: Intentional

22. MYTH OF RESILIENCE
NATION’S BUSINESS, 1977
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23. LATENCY MONKEY
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24. LESSON # 3 : THE CULTURE ASPECTS OF CHAOS
ARE HARD
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25. BRUCE M. WONG | @BRUCE_M_WONG
MOST ENTERPRISES HIRE PEOPLE TO FIX THINGS. NETFLIX
HIRES PEOPLE TO BREAK THINGS….
…WE SHOULD EMBRACE NETFLIX'S CULTURE OF "CHAOS ENGINEERING"
THROUGHOUT ORGANIZATIONS OF ALL SHAPES AND SIZES.

26. BRUCE M. WONG | @BRUCE_M_WONG

27. SEEK PROGRESS OVER PERFECTION
TWILIO LEADERSHIP PRINCIPLE
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28. GAME DAYS - BENEFITS
•Training New Engineers
•Discover Instrumentation gaps
•New Product Launches
•Incident Management Practices
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29. GAME DAYS - THE SETUP
•Two “on-call” teams
•Separate rooms, separate slack
channels
•Master of Disaster
•Incident Commander
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30. LEVERAGE EXISTING TESTBOTS
•Functionally test fallback code
•Early warning!
•Existing Integrations with
Telemetry, PagerDuty, Slack
•Incorporate into Canary
process
FUTURE
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31. RECAP
Lesson # 1 : Trust your resilience
Lesson # 2 : Fixing one failure mode exposes new ones
Lesson # 3 : The culture aspects of Chaos are HARD
Get started today!
Game Days are your friend - do them early and often
Testbots + focus on developer productivity
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32. WHEN YOU WISH UPON A BLUE MOON
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