Hands-On Microservices with Kubernetes

Envoy

Envoy is a high-performance proxy that's implemented in C++. It was developed by Lyft and functions as the data plane of Istio, but it is also an independent CNCF project and can be used on its own. For each pod in the service mesh, Istio injects (either automatically or through the istioctl CLI) an Envoy side container that does the heavy lifting:

• Proxy HTTP, HTTP/2, and gRPC traffic between pods
• Sophisticated load balancing
• mTLS termination
• HTTP/2 and gRPC proxies
• Providing service health
• Circuit breaking for unhealthy services
• Percent-based traffic shaping
• Injecting faults for testing
• Detailed metrics

The Envoy proxy controls all the incoming and outgoing communication to its pod. It is, by far, the most important component of ...