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Istio cheat sheet & developer notes

Istio cheat sheet and 2 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Istio

Traffic Management & mTLS

Traffic Management & mTLS. Sidecars & Injection. # Every pod in this namespace automatically gets an Envoy sidecar added — # no per-deployment YAML edits needed kubectl label namespace my-app istio-injection=enabled # Th…

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02 · Istio

Resilience, Security & Observability

Resilience, Security & Observability. Circuit Breaking & Fault Injection. apiVersion: networking.istio.io/v1 kind: DestinationRule metadata: name: payments spec: host: payments trafficPolicy: outlierDetection: # circuit …

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Concepts to know for Istio

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Load Balancing: L4 vs L7, Algorithms, Health ChecksWhat L4 and L7 balancers actually forward, why least-request beats round robin, how health checks and draining make deploys safe, and why gRPC breaks it.Intermediate·13 minThe TLS Handshake and Certificate ChainsWhat happens in the round trip before HTTPS sends a byte: key exchange, certificate checks, forward secrecy, 0-RTT, and why handshakes fail in production.Intermediate·14 minBlue-Green and Canary DeploymentsBlue-green switches all traffic at once, canary shifts it in steps judged by metrics. How each rolls back, and why schema changes must expand, then contract.Intermediate·13 min

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