Istio

What is Istio

Istio is a implementation of service mesh. It design to provide L

a) traffic route option between services

b) monitor the traffics go through different serivce  for different metrics e.g http return code . request per sec ; latency etc

c) act as load balancer to route traffic to backend pod with configured ratio ;

d) support TLS between services in same clusder 

e) visuliase the connection , tracing the request between the services (Kiali; tracing; jaeger)

Implementation 

It not need change application yaml file, it will create new namespace called istio, and run a envoy sidecar container in the everypd .

 

Setup 

The applications in a namespace need to be labled.

kubectl lable namespace <namespace> istio-injection=enabled 

The pods need restart after that. 

To install addon , apply the yaml in  istio-1.9.1/samples/addons; 

Promethuse etc will be created as new pod in namespace of istio. 

The only requirment in app yaml is add a lable named with app

 

Vitural Serice 

Implement retry, traffic split,  carnary deployment etc. 

https://istio.io/latest/docs/reference/config/networking/virtual-service/