目前有关于服务网格（Service Mesh）的需求日益增多，所以需要及时了解一下相关的知识。
Istio is a Service Mesh
服务网格 (Service Mesh) 管理微服务间的通信。
微服务架构
- business logic (BL)
- communication configurations (COMM)
- security logic (SEC)
- retry logic (R)
- metrics & tracing logic (MT)
分离业务逻辑和非业务逻辑
Service Mesh 解决方案
Sidecar Proxy
- handles these networking logic
- acts as a Proxy
- third-party application
- cluster operators can configure it easily
Control Plane
- Control Plane injects the Sidecar Proxy
核心特性
Traffic Splitting
蓝绿发布
Istio 架构
Envoy proxy
Virtual Service
Destination Rule