A service mesh is an infrastructure layer that manages service-to-service communication in microservices architectures. It handles load balancing, encryption, authentication, observability, and retries — without requiring changes to application code.

How Service Mesh Works

Istio and Linkerd are the most popular service meshes. They inject sidecar proxies next to each service that intercept all network traffic. This gives you mutual TLS encryption, request tracing, traffic splitting, and circuit breaking without modifying your services.

Key Concepts

  • Sidecar Proxy — A lightweight proxy (Envoy) deployed alongside each service that intercepts and manages all network traffic
  • Mutual TLS — Automatic encryption between all services in the mesh — no manual certificate management

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Frequently Asked Questions

Do I need a service mesh?

Only if you're running many microservices in Kubernetes and need advanced traffic management, observability, and security. For most applications, a service mesh adds unnecessary complexity.

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