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Chapter 16. Tuning serving configuration

16.1. Overriding Knative Serving system deployment configurations
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You can override the default configurations for some specific deployments by modifying the workloads spec in the KnativeServing custom resources (CRs).

16.1.1. Overriding system deployment configurations
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Currently, overriding default configuration settings is supported for the resources, replicas, labels, annotations, and nodeSelector fields, as well as for the readiness and liveness fields for probes.

In the following example, a KnativeServing CR overrides the webhook deployment so that:

  • The readiness probe timeout for net-kourier-controller is set to be 10 seconds.
  • The deployment has specified CPU and memory resource limits.
  • The deployment has 3 replicas.
  • The example-label: label label is added.
  • The example-annotation: annotation annotation is added.
  • The nodeSelector field is set to select nodes with the disktype: hdd label.
Note

The KnativeServing CR label and annotation settings override the deployment’s labels and annotations for both the deployment itself and the resulting pods.

KnativeServing CR example

apiVersion: operator.knative.dev/v1beta1
kind: KnativeServing
metadata:
  name: ks
  namespace: knative-serving
spec:
  high-availability:
    replicas: 2
  workloads:
  - name: net-kourier-controller
    readinessProbes:
1 

      - container: controller
        timeoutSeconds: 10
  - name: webhook
    resources:
    - container: webhook
      requests:
        cpu: 300m
        memory: 60Mi
      limits:
        cpu: 1000m
        memory: 1000Mi
    replicas: 3
    labels:
      example-label: label
    annotations:
      example-annotation: annotation
    nodeSelector:
      disktype: hdd
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1
You can use the readiness and liveness probe overrides to override all fields of a probe in a container of a deployment as specified in the Kubernetes API except for the fields related to the probe handler: exec, grpc, httpGet, and tcpSocket.
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