SlideShare a Scribd company logo
(but without the swearing)
Walk-through:
Debugging an RBAC
Problem in Istio
Matt Turner
KubeCon, San Diego California | November 2019 @mt165 | mt165.co.uk
*no fucking promises
Introduction
RBAC: 20, 21
Forking Shirtballs
Debuggability =
Observability X Controllability
Observability
“... the behaviour of the entire system can be determined by only looking at its
inputs and outputs” - Kalman, 1961
The software has a model of the world, which may be wrong.
You have a model of its model, which may be wrong.
Envoy Logs: 30
engarde!
Traffic Dump: 31
ksniff!
It’s all meshed up!
Controllability
Permissive RBAC: 32
Change One Thing At A Time
R-BACk on: 20
Follow the Pipeline: 33
Hone in: 34, 35
Guess and check: 36
⸘What the actual fuck‽
Why? Can do end-user, port, etc based authz
ServiceRole[Binding] will be gone from 1.6, replaced with AuthorizationPolicy
One more: Don’t Panic!
Thanks!
@mt165
Slides
Videos
Demo code
mt165.co.uk

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Debugging an RBAC Problem in Istio