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Introduction to Istio on Kubernetes
- 1. Introduction to Istio on Kubernetes Jonh Wendell Software Engineer, Red Hat DevConf.US, Aug 2018
- 3. 3
- 4. 4 Microservices Service A Service B Service C
- 8. 8 ● Deployment platform ● DNS based service discovery ● Simple L3/4 load balancing ● Not so adequate for service-to-service communication
- 9. 9 Services have to deal with ● Client Side Load Balancing ● Fault tolerance – Timeouts and Retries ● Observability ● Monitoring & Tracing ● Circuit Breaking
- 10. 10 Popular tools ● Eureka – Service Registry ● Ribbon – Client side load balancer ● Hystrix – Circuit Breaker ● Zipkin – Distributed Tracing
- 11. 11 “Micro” Services? Actual Service A Ribbon Hystrix Metrics Tracer Microservice A
- 12. 12 Library approach? What if... ● You use Spring? ● Vert.x? ● Go? ● Python? ● Ruby? ● Perl? ● I’m kidding, don’t use Perl :)
- 13. 13 “Micro” Services? Actual Service A Library 1 Library 2 Library 3 Library 4 Microservice A Actual Service B Library 5 Library 6 Library 7 Library 8 Microservice B
- 14. 14 Micro Services! Actual Service A Microservice A Actual Service B Microservice B Proxy Common functionality goes here!
- 15. 15 Meet Envoy Actual Service A Microservice A Actual Service B Microservice B Proxy This is Envoy
- 16. 16 What is Envoy? ● service proxy, developed by Lyft ● written in C++, highly parallel, non-blocking ● L3/4 network filter ● out of the box L7 filters ● HTTP 2, including gRPC ● baked in service discovery/health checking ● advanced load balancing ● stats, metrics, tracing
- 17. 17 Sidecar model Actual Service A Microservice A Envoy Actual Service B Microservice B Envoy A kind of deployment in Kubernetes PodPod
- 18. 18 Service communication calls http://serviceB Actual Service A Microservice A Actual Service B Microservice B PodPod Without Envoy
- 19. 19 Service communication calls http://serviceB Actual Service A Microservice A Envoy Actual Service B Microservice B Envoy PodPod With Envoy
- 20. 20 Service Mesh Actual Service 1 Microservice 1 Envoy Actual Service N Microservice N Envoy Actual Service 2 Microservice 2 Envoy . . .
- 21. 21 Configure a fleet of Envoys can be verbose and error prone without automation. We need a Control Plane.
- 22. 22 Meet Istio Service Mesh
- 23. 23 What is Istio? ● Control plane for a service mesh ● Abstracts Envoy concepts and configurations ● Easy to operate: YAML files a la Kubernetes ● Kubectl or Istioctl can be used ● Created by Google, with the help of other companies ● New project, just reached 1.0
- 24. 24 Istio Service Mesh Actual Service 1 Microservice 1 Envoy Actual Service N Microservice N Envoy Istio Control Plane Pilot Configure proxies Istio Data Plane
- 25. 25 Istio Service Mesh Actual Service 1 Microservice 1 Envoy Actual Service N Microservice N Envoy Istio Control Plane Pilot Configure proxies Istio Data Plane Service Discovery Rules (YAML)
- 26. 26 What pilot can do? ● Traffic control – enforce route rules & policies ● Resiliency – circuit breaker, timeouts, retries Actual Service A Microservice A Envoy Actual Service B Microservice B Envoy
- 27. 27 Istio Service Mesh Actual Service 1 Microservice 1 Envoy Actual Service N Microservice N Envoy Pilot Mixer Check / Report Adapters: API Mgt Prometheus Tracing...
- 28. 28 What mixer can do? ● Quota / API Management ● Telemetry (Prometheus, ...) ● Tracing (Jeager, …) ● Your own integration (pluggable model)
- 29. 29 Istio Service Mesh Actual Service 1 Microservice 1 Envoy Actual Service N Microservice N Envoy Istio Control Plane Pilot MixerCitadel Manage TLS certs
- 30. 30 What citadel can do? ● Enforce mTLS between services ● Along with mixer and pilot allows authorization and auditing Actual Service A Microservice A Envoy Actual Service B Microservice B Envoy Mutual TLS
- 31. 31 Demo?