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Event-driven Autoscaling with KEDA & AKS by Ronak Banka

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Kubernetes is an excellent container orchestration platform, but when it comes to AutoScaling of containers, there is limited capability with just CPU & memory metrics scaling applications. This talk will introduce how can the combination of KEDA & Azure Kubernetes Service can help AutoScaling of applications based on metrics from various metric sources, eg. Prometheus, Kafka, etc.

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Event-driven Autoscaling with KEDA & AKS by Ronak Banka

  1. 1. Event Driven Scaling with KEDA & AKS Ronak Banka
  2. 2. HELLO! I am Ronak Banka Senior Solutions Architect with VMware, Singapore ▸ Loves Kubernetes, Cloud & Containers ▸ SRE practitioner ▸ Loves Cooking 2 @ronakbanka https://devstack.in
  3. 3. Agenda ▸ Why AutoScaling? ▸ Scaling options in K8s ▸ What is KEDA? ▸ KEDA Architecture Overview ▸ Demo ▸ Scaling using Prometheus metrics 3
  4. 4. Why AutoScaling?
  5. 5. Scaling Options in k8s
  6. 6. Scaling options 7 ● Manual Scaling ● Horizontal pod Autoscaler (HPA) ● Virtual Nodes ● Event Driven Scaling
  7. 7. ▸ This type of Scaling depends on human action to scale the application $ Kubectl scale deployment/my-app --replicas=2 Similar operation can be done for cluster Autoscaling using az cli 8 Manual Scaling
  8. 8. ▸ This type of Scaling depends on system metrics to scale the application $ Kubectl autoscale deployment/my-app --max=5 --cpu-percent=80 Limited by metric types which can be used out of the box 9 Horizontal pod Autoscaler (HPA)
  9. 9. ▸ This type of Scaling implements Virtual Kubelet in AKS cluster. ▸ Azure container instances(ACI) are responsible for running extra pods without any additional infrastructure required. 10 Virtual Nodes
  10. 10. 11 Virtual Nodes
  11. 11. ▸ This type of Scaling can use metrics from different sources. ▸ Uses HPA in backend for actual scaling ▸ Can be used in combination with Virtual Node 12 Event Driven Scaling
  12. 12. What is KEDA?
  13. 13. 14 KEDA is a Kubernetes-based Event Driven Autoscaler
  14. 14. KEDA works alongside standard Kubernetes components like the Horizontal Pod Autoscaler and can extend functionality without overwriting or duplication. Roles of Keda-operator: ▸ Agent - KEDA activates and deactivates Kubernetes Deployments to scale to and from zero on no events. ▸ Metrics - KEDA acts as a Kubernetes metrics server that exposes rich event data like queue length or stream lag to the Horizontal Pod Autoscaler 15 How does KEDA works?
  15. 15. 16 KEDA Architecture ScaledObjects: Desired mapping between an event source and the Kubernetes Deployment External trigger source: Prometheus, Kafka, RabbitMQ, etc Scaler: Detect if a deployment should be activated or deactivated, and feed custom metrics for a specific event source Metrics adapter: Presents metrics from external sources to the Horizontal Pod Autoscaler
  16. 16. 17 KEDA Scalers
  17. 17. DEMO TIME
  18. 18. 19
  19. 19. 20 THANKS! Any questions? You can find me at: ▸ @ronakbanka on Twitter ▸ Check my Blog on https://devstack.in

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