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Why this module exists. Microservices and service-mesh architectures create dozens of network calls per user transaction, each a potential security gap. Service meshes (Istio, Linkerd, Consul Connect) provide a uniform layer for mTLS, authorisation, and observability across services. This module covers the security patterns that actually work in production.
Why this module exists. Microservices security cannot be solved at the firewall — there are too many internal calls, the topology changes constantly, and “inside the network” is too permissive. Service meshes are how mature programmes address this. This module is the practitioner pattern.
What a service mesh does
A service mesh deploys a sidecar proxy (typically Envoy) alongside every service. All inter-service traffic flows through these proxies. The proxies provide:
- Identity: each service has a cryptographic identity (X.509 cert, SPIFFE SVID).
- mTLS: service-to-service traffic encrypted and mutually authenticated automatically.
- Authorisation: policy-driven allow/deny on service-to-service calls.
- Observability: metrics, traces, logs uniformly across all services.
- Traffic management: retries, timeouts, circuit breakers, rate limits.
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