Istio

 Istio is Service Mesh

• Service Mesh is extra layer of software that is deployed along side your cluster(ie Kubernetes)
  
• Its layer of software sitting underneath all of the pods.
• All the network traffic within Cluster will be routed thru Service Mesh Software

How Istio works

• Istio injects its own container in each of the pods. It is called Proxy
• Network request from container it is routed to Proxy
  
• Proxy will relay it to target proxy
• Proxies are collectively called "Data Plane" 
• Istio System is "Control Plane"
  

Istio Deamon Responsibilities

• Statisitics/Telemetry about system

Kiali

• Service Mesh Observability & Configuration

Envoy(The Data plane)

• automatic retries
• Circuit breaking
• This sidecar proxy
• Why Envoy
• It is capable of being deployed into many different types of clusters.
• Istio simplifies Envoy
• Istio understands Kubernetes

Istio Telemetry

• Kiali
• Show request traffic between the services
• dynamic traffic routing
• Distributed Tracing-> Open Tracing
  
• Graph that is tracking the progressive of entier graph is called Trace. Each individual timing element is called Spam
  
• Chain of events
• complete route of request
• guid-x-request-id -> randomly generated id for every request
• Istio generate the guid when request comes into cluster

Traffic Management

• Canary Release
• Make Image live for small percentage of time

Load Balance

• Session Affinity

Gateway

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