3.4. Scale-to-zero

Prerequisites

• You have installed OpenShift Serverless Operator and Knative Serving on your cluster.
• You have cluster administrator permissions on OpenShift Container Platform, or you have cluster or dedicated administrator permissions on Red Hat OpenShift Service on AWS or OpenShift Dedicated.
• You are using the default Knative Pod Autoscaler. The scale to zero feature is not available if you are using the Kubernetes Horizontal Pod Autoscaler.

Procedure

• Modify the enable-scale-to-zero spec in the KnativeServing custom resource (CR):

  Example KnativeServing CR

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeServing
  metadata:
    name: knative-serving
  spec:
    config:
      autoscaler:
        enable-scale-to-zero: "false" 

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  The enable-scale-to-zero spec can be either "true" or "false". If set to true, scale-to-zero is enabled. If set to false, applications are scaled down to the configured minimum scale bound. The default value is "true".

Prerequisites

• You have installed OpenShift Serverless Operator and Knative Serving on your cluster.
• You have cluster administrator permissions on OpenShift Container Platform, or you have cluster or dedicated administrator permissions on Red Hat OpenShift Service on AWS or OpenShift Dedicated.
• You are using the default Knative Pod Autoscaler. The scale-to-zero feature is not available if you are using the Kubernetes Horizontal Pod Autoscaler.

Procedure

• Modify the scale-to-zero-grace-period spec in the KnativeServing custom resource (CR):

  Example KnativeServing CR

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeServing
  metadata:
    name: knative-serving
  spec:
    config:
      autoscaler:
        scale-to-zero-grace-period: "30s" 

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  The grace period time in seconds. The default value is 30 seconds.