KEDA - Mastering Scale to Zero by Daniel Hasselwander

Slides from the following meetup: https://www.meetup.com/de-DE/microsoft-azure-zurich-user-group/events/292938328/

KEDA is an Event Driven Autoscaler for workloads running on Kubernetes. It provides mechanisms to scale those workloads depending on external systems, such as messaging or telemetry systems.

This talk will provide an introduction to KEDA and the underlying concepts. The usage of KEDA will be demonstrated on Azure with an AKS cluster running a demo application, which is autoscaled through KEDA. We will see how to setup KEDA and configure it to scale the application depending on the amount of messages in an Azure Service Bus Topic

About Daniel:
I have been working as an Azure Engineer at ti&m in Zurich since 2021. Ti&m is an IT service provider offering services along the entire IT value chain. My role is to support customers in the selection of Azure Cloud components and to implement them afterwards. My main technologies are container technologies (e.g. AKS) and Terraform as an IaaC tool.

https://www.linkedin.com/in/daniel-ha%C3%9Felwander-786826137/

Transcript

1. Keda Mastering Scale-to-Zero Daniel Hasselwander Zürich, 16.05.2023 Azure Zürich User Group
3. It is Monday 10AM, now Some person leaves the house and goes to work
5. Why is this situation important for today
6. What is a good software ?
7. Doing the right things, with as little cost in operations as possible
8. Same Picture – another Situation
9. Node 1 Node 2 Node 3 Node 4
10. It is Sunday, now
11. Node 1 Node 2 Node 3 Node 4
12. What we want
13. Node 1 Node 2
14. Our Path What is Keda What we want How it works Demo
15. Who am I ?
16. Scale-To-Zero What we want ? Scale Workload on external metric 1 0 or 0 1
17. What is Keda ? − Kubernetes-based Event Driven Autoscaler − Works alongside standard components − Installable with helm − Doku on keda.sh
18. Agent – Scale to Zero activate and deactivate Deployments «keda-operator» container How it works ? KEDA Parts Metrics Server exposes event data for HPA to scale out «keda-operator-metrics- apiserver» container
19. ScaledObjects Events Deployment etc. How it works ? Custom Ressources (CRD) ScaledJobs Events Kubernetes Job TriggerAuthentication Namespace useable credentials ClusterTriggerAuthentication Cluster useable credentials
20. Demo
21. Demo 1
22. Demo 2
23. But what if my application work with http requests
24. KEDA – HTTP Scaler − An HTTP "event" is not well defined − no out-of-the-box single system that can provide an API to measure the current number of incoming HTTP events or requests. − must to be integrated into the HTTP routing system
25. KEDA – HTTP Scaler Add-On − KEDA core project has purposely not built generic HTTP-based scaling − Beta Status − Try it and give the community feedback − GitHub - kedacore/http-add-on: Add-on for KEDA to scale HTTP workloads
26. Node 1 Node 2 Node 3 Node 4
27. It is the next Sunday, now
28. Node 1 Node 2
29. KEDA – When to use it − Can be your default scale mechanism − Scale-To-Zero != Realtime − Azure Function in your Cluster
30. KEDA – Good to know − Short polling only for activate deployment − Don´t combine ScaleObject with HPA − Can use multiple scaler − Scale on your own systems − Azure CLI implement a KEDA extension for Functions
31. The Code is published on Github Hassel93/cn_meetup_keda: Repository with all used files for demo of (github.com)
32. Thank you for your attention ! Questions ?