Service meshes add observability, security, and traffic management to microservices. But they also add complexity. When are they worth it?
What Service Meshes Provide
- mTLS between services
- Traffic splitting for deployments
- Observability without code changes
- Retries and circuit breaking
Popular Options
Istio: Feature-rich, complex Linkerd: Lightweight, simple Consul Connect: HashiCorp ecosystem
When to Adopt
Consider a service mesh when:
- You have many services (20+)
- You need mutual TLS everywhere
- You want traffic control
- You need service-level metrics
When to Avoid
Skip the mesh when:
- You have few services
- Teams can't support complexity
- Latency requirements are extreme
Sidecar Alternatives
eBPF-based meshes like Cilium offer mesh features without sidecars.