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Notes for KEDA

KEDA is a project that provides Kubernetes Event-driven Autoscaling. More info at keda.sh/.

Install

Add KEDA Helm repo:

helm repo add kedacore https://kedacore.github.io/charts
helm repo update

Install KEDA in cluster-global mode:

helm install --create-namespace -n keda keda kedacore/keda

Install the KEDA HTTP add-on:

helm install -n keda http-add-on kedacore/keda-add-ons-http

We can now deploy the following HTTPScaledObject resource:

apiVersion: http.keda.sh/v1alpha1
kind: HTTPScaledObject
metadata:
  name: hello-world
spec:
  hosts:
  - hello-world.springdeveloper.dev
  targetPendingRequests: 10
  scaledownPeriod: 30
  scaleTargetRef:
    deployment: hello-world
    service: hello-world-k8s
    port: 80
  replicas:
    min: 0
    max: 10

Once this is in place, port-forward the KEDA interceptor proxy:

kubectl port-forward svc/keda-add-ons-http-interceptor-proxy -n keda 8080:8080

In a separate terminal we can now excercise the auto-scaling.

Using curl:

curl -H 'host: hello-world.springdeveloper.dev' http://localhost:8080

Or, using siege:

siege -c 200 -r 10000 -H 'host: hello-world.springdeveloper.dev' -b http://localhost:8080