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Overriding Knative Serving system deployment configurations

You can override the default configurations for some specific deployments by modifying the deployments spec in the KnativeServing custom resources (CRs).

You can only override probes that are defined in the deployment by default.

All Knative Serving deployments define a readiness and a liveness probe by default, with these exceptions:

  • net-kourier-controller and 3scale-kourier-gateway only define a readiness probe.

  • net-istio-controller and net-istio-webhook define no probes.

Overriding system deployment configurations

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.

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
  deployments:
  - 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
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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