KubeCon EU 2024 : Knative Maintainers Session

for more information visit: https://salaboy.com

Transcript

1. Mauricio ‘Salaboy’ Salatino Dave Protasowski Luke Kingland Knative Functions: Deep Dive
2. salaboy salaboy Functions Lead & Steering OSS Engineer Mauricio Salatino salaboy
3. dprotaso lintinmybelly Serving Lead & TOC Staff Engineer Dave Protasowski dprotasowski
4. lkingland lukekingland Functions Lead Principal Engineer Luke Kingland lukekingland
5. Agenda • Knative Overview • Quick Project Updates • Functions Overview • Functions Demo • f(Knative Serving)=❤
6. Knative Overview • Kubernetes based open source building blocks for serverless • Founded - 2018 • CNCF Incubating - 2022 • knative.dev
7. Knative • Serving ◦ Autoscales your workloads based on traffic - can scale to zero • Eventing ◦ Declaratively bind consumers and producers of events • Client (kn) ◦ Create resources interactively from the command line • Functions ◦ A programming model to simplify development
8. Knative Project Updates • User Experience WG ◦ Sourcing People for User Interviews! ▪ Sign up @ https://bit.ly/knative-user-interview
9. Knative Project Updates • UX - New Mascot Kuack!
10. Knative Project Updates • Client WG ◦ Held a 48 Hour Hackathon with Prizes ◦ Check out the Wrap Up Presentation
11. Knative Project Updates • Eventing WG ◦ Eventing transport encryption (Eventing TLS) ◦ Improved Event Discovery ◦ Event Catalog with Backstage ◦ net-eventing-rabbitmq will be picked up by the RabbitMQ Team
12. Knative Project Updates • Security WG ◦ Security Audit Completed (blog)
13. Knative Project Updates • Steering Updates ◦ Proposal for Graduation https://github.com/cncf/toc/pull/1245
14. Functions Overview • Demo: https://github.com/salaboy/knative-kubecon-eu-2024/
15. Functions Demo • Keypoints ◦ Function lifecycle (instance based functions) ◦ Non-opinionated function runtime ◦ Host builder ◦ Build and Deploy independently
16. Serving + Functions • Higher Level Abstraction than Kubernetes • Container ⇒ URL • Autoscales your workloads based on traffic ◦ Scales to Zero • Automatic Certificate Provisioning for HTTPS • Revision Management & Traffic Splitting • Automatic Health Checks
17. Serving + Functions • Higher Level Abstraction than Kubernetes • Container ⇒ URL apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: my-func apiVersion: apps/v1 kind: Deployment metadata: name: my-func spec: selector: matchLabels: app: my-func replicas: 2 template: metadata: labels: app: my-func spec: containers: - name: my-func image: my-func:2.0 ports: - containerPort: 80 https://my-func.default.example.com apiVersion: v1 kind: Service metadata: name: my-func spec: selector: app: my-func ports: - port: 80 protocol: TCP targetPort: 80 apiVersion: v1 kind: Ingress metadata: name: my-func spec: rules: - http: my-func paths: - path: / backend: serviceName: my-func servicePort: 80 apiVersion: v1 kind: Service metadata: name: my-func spec: selector: app: my-func ports: - port: 80 protocol: TCP targetPort: 80 apiVersion: serving.knative.dev/v1 kind: Service metadata: name: my-func spec: template: spec: containers: - image: my-func:2.0 ports: - containerPort: 80
18. Serving + Functions • Autoscales your workloads based on traffic apiVersion: serving.knative.dev/v1 kind: Service metadata: name: nginx spec: template: spec: containerConcurrency: 1 containers: - image: nginx:1.14.2 ports: - containerPort: 80 Concurrency Number of simultaneous requests that can be processed by each replica of an application at any given time.
19. Serving + Functions Pod my-func Pod my-func Pod my-func 3 requests concurrency = 1 concurrency = 80 Pod my-func 3 requests
20. Serving + Functions concurrency = 1 concurrency = 80 Source: https://cloud.google.com/run/docs/about-concurrency
21. Serving + Functions • Concurrency ◦ Using low values ~1 ▪ More instances spin up ▪ Can hit K8s limits faster (eg. max # pods on a node) ◦ Using >1 ▪ Requires more Memory & CPU ▪ Can’t use Global State ◦ Tune the value to your function
22. • Scale to Zero Ingress Pod my-func Serving + Functions
23. • Scale to Zero Ingress Serving + Functions Activator
24. • Scale to Zero Activator Ingress Serving + Functions
25. • Scale to Zero Activator Ingress Serving + Functions
26. • Scale to Zero Activator Ingress Serving + Functions Pod my-func
27. • Scale to Zero Activator Ingress Serving + Functions Pod my-func
28. • Scale to Zero Ingress Serving + Functions Pod my-func
29. • Burst Capacity Ingress Serving + Functions Pod my-func https://knative.dev/docs/serving/load-balancing/target-burst-capacity
30. • Burst Capacity Ingress Serving + Functions Pod my-func Activator https://knative.dev/docs/serving/load-balancing/target-burst-capacity
31. • Burst Capacity Ingress Serving + Functions Pod my-func Activator https://knative.dev/docs/serving/load-balancing/target-burst-capacity Pod my-func Pod my-func Pod my-func
32. • Burst Capacity ◦ Configured via annotation on the Revision Ingress Serving + Functions Pod my-func Activator https://knative.dev/docs/serving/load-balancing/target-burst-capacity Pod my-func Pod my-func Pod my-func autoscaling.knative.dev/target-burst-capacity: "200"
33. • Burst Capacity https://knative.dev/blog/articles/demystifying-activator-on-path/ Serving + Functions https://knative.dev/docs/serving/load-balancing/target-burst-capacity
34. Q&A - Thanks! Scan the QR Code Leave Feedback!