Istio is an open-source service mesh originally developed by Google, IBM, and Lyft. It provides a uniform way to connect, secure, control, and observe microservices running on Kubernetes. Istio uses Envoy proxy as its data plane, deploying sidecar proxies alongside each service to manage all network communication.
The platform handles mutual TLS encryption between services, fine-grained traffic management (canary deployments, A/B testing, traffic splitting), fault injection for resilience testing, and detailed telemetry data collection. Istio’s control plane manages configuration and pushes policies to the Envoy sidecars.
Istio graduated as a CNCF project in 2023, confirming its maturity and broad adoption. In recent versions, Istio introduced an “ambient mesh” mode that doesn’t require sidecar proxies, addressing one of the main criticisms about the resource overhead of the traditional sidecar model.
While Istio is a community project, Google offers a managed version through Google Kubernetes Engine, and companies like Solo.io and Tetrate offer commercial Istio distributions and support. The project is widely adopted in large enterprises running complex microservices architectures on Kubernetes.
