Service Mesh: When NOT to Adopt One

Service meshes solve real problems and create new ones. The cases where the mesh is overkill or actively harmful.

Real benefits

mTLS between services. Traffic management. Observability across services.

Real but bounded benefits. Most teams overestimate them.

Real costs

Operational complexity. Sidecar proxies on every pod. Control plane to maintain.

Performance overhead. ~10% latency penalty typical.

When to skip

Small clusters (<10 services). Mesh overhead exceeds benefit.

Teams without dedicated platform engineering. Mesh requires expertise to operate.

Teams with simpler alternatives in place (network policies, CNI features).