This document provides an overview of serverless computing and Knative. It begins with defining serverless computing and distinguishing it from Function as a Service (FaaS). It then provides a high-level overview of the main components of Knative, including Knative Serving for building and deploying serverless applications and Knative Eventing for connecting those applications. It also introduces OpenShift Serverless, which is Red Hat's implementation of Knative on OpenShift. The document includes several demos and labs for hands-on experience with Knative and serverless concepts.

1. on Kubernetes, and OpenShift
Knative & Serverless
REDHATOPENSHIFTSERVERLESS
Chris Suszynski
twitter.com/ksuszynski
1

2. About me
2
Chris Suszynski
● Senior Quality Engineer at Red Hat
● Work on OpenShift Serverless
● Java & Puppet enthusiast
● Golang lover (1y)
● 15y+ of development experience
● using DevOps from ~2010, trainer
from 2014
● breathe Open Source
~70 original OSS repos
● public speaker on meetups &
conferences
● happy father & husband

3. Agenda
3
REDHATOPENSHIFTSERVERLESS
1. Introduction
2. What is Serverless & Knative?
3. Serverless vs FaaS
4. Knative components overview
5. Knative Serving
6. Knative Eventing
7. OpenShift Serverless
8. Q&A

4. Start with something cool!
4
Demo/Labs

5. Unpopular opinion
5
“Most enterprise
applications are still
monolithic“

6. Monolith
6
MyBank

7. Inside monolith
7

8. Dividing monolith
8

9. Enter microservices
9

10. Enter microservices
10

11. Enter microservices
11

12. Network of microservices
12

13. Microservices with their data
13

14. Multiple points of entry
14

15. Teams & pipelines
15

16. Mindblown
16

17. Scary transformation
17
Lovely Little Big Mono
Every 3 months Every week/day/hour

18. We need new ideas
18
“We cannot solve our
problems with the same
thinking we used when
we created them”
⸺ Albert Einstein
(Theoretical Physicist)

19. 19
Road to Awesomeness
Self-Service,
On-Demand,
Elastic
Infrastructure
Automation CI & CD
Deployment
Pipeline
Advanced
Deployment
Techniques
Microservices
Re-Org to
DevOps

20. 20
Serverless
Computing

21. Serverless computing
21
What is
?
“Serverless computing refers to the concept of
building and running applications that do not require
server management.
It describes a finer-grained deployment model where
applications, bundled as one or more functions, are
uploaded to a platform and then executed, scaled, and
billed in response to the exact demand needed at the
moment.”
⸺ Cloud Native Computing Foundation
https://www.cncf.io/blog/2018/02/14/cncf-takes-first-step-towards-serverless-computing

22. 22
Short history of Serverless
AWS
S3
March
2006
AWS
Lambda
November
2014
AWS
EC2
August
2006
Serverless
Described
Thoughtworks
August 2016
Serverless
Coined
October
2012
Serverless
Assess
Thoughtworks
Radar
April 2016
AWS
Dynamo
DB
January
2012
Firebase
September
2011
Iron.io
July
2011
Google
Cloud
Function
Feb 2016
Azure
Functions
Mar 2016
Pivotal
Riff
Dec 2017
Oracle
Functions
Sept 2016
IBM
Bluemix
OpenWhisk
Feb 2016
Oracle
Fn Project
Oct 2017

23. Serverless vs FaaS
23
Serverless
● No server mgmt
● Ease of use
● Scales to zero
FaaS
● Builds and runs
your function
● Atomic size

24. FaaS Kubernetes Players
24

25. 25
Knative

26. 26
Knative announced July 24, 2018

27. Knative?
27
What is
● Open source project started by Google
● Serverless computing on Kubernetes
● Set of loosely coupled primitives for all
● Makes using Kubernetes easier for Dev & Ops
● Autoscaling, from zero to ∞
● Advanced techniques like Blue/Green
deployments, eventing system

28. Knative’s Primary Components
28
ServingEventing Cli
Build
X Replaced with Tekton

29. 29
Knative primitives
DX Functions Event Sources Build ToolsVendors FaaS Stuff
Traffic shaping Autoscaling
Invokers Event Binding
Routing
Observability
Serverless Stuff
Deployment Replicaset Pod ServiceCRD Infrastructure

30. 30
What Knative provides?
Traffic shaping Autoscaling
Invokers Event Binding
Routing
Observability
Serverless Stuff
"Knative provides a set of middleware components
that are essential to build modern, source-centric,
and container-based applications that can run
anywhere: on premises, in the cloud, or even in a
third-party data center"

31. Interesting Capabilities
31
• Scale-to-zero: No pod == no memory
• Scale-from-zero: Traffic spike starts N pods
• Configurations & Revisions - built-in Blue/Green
• In-Cluster Image Building (Tekton)
• Traffic splitting
• Eventing System

32. 1,000 feet view
32

33. Knative
33
Exercises
● bit.ly/knative-tutorial
● developers.redhat.com/coderland/serverless

34. Knative Serving
34
A closer look

35. Kubernetes service & deployment
35
Deployment
Replicaset
PodService PodPod

36. kubectl get crd | grep serving
configurations.serving.knative.dev
revisions.serving.knative.dev
routes.serving.knative.dev
services.serving.knative.dev
Knative Serving CRD’s
36

37. Knative service
37
Deployment N
Replicaset N
PodService
PodPod N
Configuration
Revision N
serving.knative.dev/v1alpha1
Service
Route
Service
Istio Gateway
VirutalService
Activator
ImageCache
PodAutoscalerClusterIngress

38. kubectl -n knative-serving edit
configmap config-autoscaler
container-concurrency-target-default: "100"
scale-to-zero-grace-period: 60s
stable-window: 30s
Knative Serving Autoscaler
38

39. Knative Serving
39
Demo/Labs

40. Knative Eventing
40
A closer look

41. kubectl get crd | grep eventing
channels.eventing.knative.dev
subscriptions.eventing.knative.dev
brokers.eventing.knative.dev
cronjobsources.sources.eventing.knative.dev
githubsources.sources.eventing.knative.dev
kuberneteseventsources.sources.eventing.knative.dev
containersources.sources.eventing.knative.dev
Knative Eventing CRD’s
41

42. Knative Eventing elements
42
Kafka
implementation
Topic
Event
Producer
Event
Source
Channel
Broker Trigger Subscription
Kafka
implementation
Topic
Trigger Filtering
Knative
Service

43. Cloud Events
43
Knative Eventing
use CloudEvents

44. Knative Eventing Sources
44
● Github
● Websockets
● AWS SQS
● GCP PubSub
● Apache Kafka
● Apache Camel
● github.com/knative/eventing-contrib
● github.com/knative/eventing-sources

45. Knative Eventing
45
Demo/Labs

46. 46
OpenShift Serverless

47. OpenShift Serverless?
47
What is
● Red Hat product, based on Knative project
● Uses Red Hat Service Mesh, in future Kourier
● Supported & tested Knative on OpenShift
● Focus on Developer Experience (DX)
● Easy to install with OpenShift Operator Hub
● Awesome administration console

48. OpenShift Serverless
48
Demo/Labs

49. 49
Knative Resources
● bit.ly/knative-tutorial
● developers.redhat.com/coderland/serverless
● github.com/cardil/knative-kafka-demo
● bit.ly/kubernetes-tutorial
● bit.ly/istio-tutorial
● bit.ly/quarkus-tutorial
● developers.redhat.com

50. linkedin.com/in/krzysztof-suszynski
youtube.com/user/RedHatVideos facebook.com/RedHatDeveloperProgram
twitter.com/ksuszynski
REDHATOPENSHIFTSERVERLESS
50
red.ht/openshift
Thank you.