keda

KEDA is an event-based autoscaler for workloads on Kubernetes, allowing fine-grained autoscaling including to and from zero for event driven Kubernetes workloads. The KEDA Helm chart automates deployment and configuration of KEDA in Kubernetes clusters using Minimus images.

Prerequisites

A subscription to the Minimus images included in the chart
A running Kubernetes cluster (v1.23 or higher is recommended)
kubectl installed and configured
Helm v3.8 or higher for OCI support (Installation instructions)
Cluster Admin privileges

Note: KEDA installs Custom Resource Definitions (CRDs) for ScaledObjects, ScaledJobs, and TriggerAuthentications. Ensure the installing user has cluster-admin privileges.

Try It Out

In this example we will deploy KEDA on a Kubernetes cluster using the Minimus KEDA Helm chart. KEDA will provide event-driven autoscaling for your Kubernetes workloads.

Step 1: Start Cluster

If you have a cluster to work with, skip this step. Otherwise, start a Minikube cluster. Deployment instructions

Step 2: Create Namespace

Create a namespace:

kubectl create ns keda

Step 3: Deploy the Helm Chart

Deploy the Minimus Helm chart:

helm install my-keda oci://helm.mini.dev/keda \
  --version 2.21.0 \
  -n keda \
  --wait

If you want to override the chart's defaults, go to the Values tab, save a copy locally with your changes. Deploy the chart with your overrides using -f values.yaml:

helm install my-keda oci://helm.mini.dev/keda \
  --version 2.21.0 \
  -f values.yaml \
  -n keda \
  --wait

Step 4: Verify KEDA is Running

Confirm the chart deployed successfully and KEDA started:

kubectl get pods -n keda

You should see output similar to:

NAME                                                      READY   STATUS    RESTARTS   AGE
my-keda-keda-admission-webhooks-xxxxxxxxx-xxxxx           1/1     Running   0          2m
my-keda-keda-operator-xxxxxxxxx-xxxxx                     1/1     Running   0          2m
my-keda-keda-operator-metrics-apiserver-xxxxxxxxx-xxxxx   1/1     Running   0          2m

Step 5: Test Event-Driven Autoscaling

Create a sample deployment to use as a scale target:

kubectl create deployment sample-app --image=nginx --replicas=1 -n keda

Create a ScaledObject to test KEDA's event-driven autoscaling:

cat <<EOF | kubectl apply -f -
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: sample-scaledobject
  namespace: keda
spec:
  scaleTargetRef:
    name: sample-app
  minReplicaCount: 1
  maxReplicaCount: 5
  triggers:
    - type: cron
      metadata:
        timezone: Etc/UTC
        start: "0 0 * * *"
        end: "0 23 * * *"
        desiredReplicas: "2"
EOF

Verify the ScaledObject was created and is ready:

kubectl get scaledobject -n keda

You should see output similar to:

NAME                  SCALETARGETKIND      SCALETARGETNAME   MIN   MAX   READY   ACTIVE    AGE
sample-scaledobject   apps/v1.Deployment   sample-app        1     5     True    Unknown   30s

Step 6: Clean Up

Uninstall the chart and delete the namespace to remove all resources:

helm uninstall my-keda -n keda
kubectl delete namespace keda

Terms & Info

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