Knative & Serverless on Kubernetes, and OpenShift

Is Serverless just running functions in a cloud? It’s more than that! Serverless computing refers to the concept of building and running applications that do not require server management.

It describes a 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.

During the talk I’ll show how to use Knative both on Kubernetes and on OpenShift platform. Hopefully we will see why your organization should consider using Knative as one of its primary deployments models on hybrid cloud world.

Transcript

1. on Kubernetes, and OpenShift Knative & Serverless RED HAT OPENSHIFT SERVERLESS 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 RED HAT OPENSHIFT SERVERLESS 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 Serving Eventing Cli Build X Replaced with Tekton
29. 29 Knative primitives DX Functions Event Sources Build Tools Vendors FaaS Stuff Traffic shaping Autoscaling Invokers Event Binding Routing Observability Serverless Stuff Deployment Replicaset Pod Service CRD 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 Pod Service Pod Pod
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 Pod Service Pod Pod N Configuration Revision N serving.knative.dev/v1alpha1 Service Route Service Istio Gateway VirutalService Activator ImageCache PodAutoscaler ClusterIngress
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 RED HAT OPENSHIFT SERVERLESS 50 red.ht/openshift Thank you.