advanced~3h
Service Mesh: Istio and mTLS
Resilience4j protects a service from a failure it already knows about, at the application layer. A service mesh moves traffic management and security entirely out of application code — this module covers the sidecar proxy pattern, Istio's VirtualService and DestinationRule, and mutual TLS for zero-trust service-to-service security.
Learning objectives
- Beginner: Explain the sidecar proxy pattern and why Istio injects a proxy container into every Pod.
- Beginner: State what mutual TLS adds over regular (one-way) TLS.
- Intermediate: Distinguish what a VirtualService configures from what a DestinationRule configures in Istio.
- Intermediate: Explain how Istio can enforce mTLS between services without any change to application code.
- Advanced: Decide which concerns belong in Resilience4j (application-level) versus the mesh (platform-level), and justify the split.
- Advanced: Describe what 'zero trust' means in a service mesh context and how mTLS plus policy enforcement together deliver it.
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Service Mesh: Istio and mTLS