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Introduction to Istio on
Kubernetes
Jonh Wendell
Software Engineer, Red Hat
DevConf.US, Aug 2018
2
Microservices?
3
4
Microservices
Service A Service B Service C
5
Microservices
Service A
(Java)
Service B
(Python)
Service C
(Go)
6
Distributed Systems
●
Deployment
●
Resiliency
●
Networking
●
Security
7
To the rescue
8
●
Deployment platform
●
DNS based service discovery
●
Simple L3/4 load balancing
●
Not so adequate for service-to-service communication
9
Services have to deal with
●
Client Side Load Balancing
●
Fault tolerance – Timeouts and Retries
●
Observability
●
Monitoring & Tracing
●
Circuit Breaking
10
Popular tools
●
Eureka – Service Registry
●
Ribbon – Client side load balancer
●
Hystrix – Circuit Breaker
●
Zipkin – Distributed Tracing
11
“Micro” Services?
Actual Service A
Ribbon
Hystrix
Metrics
Tracer
Microservice A
12
Library approach? What if...
●
You use Spring?
●
Vert.x?
●
Go?
●
Python?
●
Ruby?
●
Perl?
●
I’m kidding, don’t use Perl :)
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
Micro Services!
Actual Service A
Microservice A
Actual Service B
Microservice B
Proxy
Common functionality goes here!
15
Meet Envoy
Actual Service A
Microservice A
Actual Service B
Microservice B
Proxy
This is Envoy
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
Sidecar model
Actual Service A
Microservice A
Envoy
Actual Service B
Microservice B
Envoy
A kind of deployment in Kubernetes
PodPod
18
Service communication
calls http://serviceB
Actual Service A
Microservice A
Actual Service B
Microservice B
PodPod
Without Envoy
19
Service communication
calls http://serviceB
Actual Service A
Microservice A
Envoy
Actual Service B
Microservice B
Envoy
PodPod
With Envoy
20
Service Mesh
Actual Service 1
Microservice 1
Envoy
Actual Service N
Microservice N
Envoy
Actual Service 2
Microservice 2
Envoy
. . .
21
Configure a fleet of Envoys can be verbose
and error prone without automation.
We need a Control Plane.
22
Meet Istio Service Mesh
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
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
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
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
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
What mixer can do?
●
Quota / API Management
●
Telemetry (Prometheus, ...)
●
Tracing (Jeager, …)
●
Your own integration (pluggable model)
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
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
Demo?
32
Thank you
●
https://istio.io
●
https://learn.openshift.com
●
Email: jonh.wendell@redhat.com
●
Twitter: @jwendell

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