Chapter 14. Tuning serving configuration
14.1. Overriding Knative Serving system deployment configurations
You can override the default configurations for some specific deployments by modifying the workloads spec in the KnativeServing custom resources (CRs).
14.1.1. 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
readinessprobe timeout fornet-kourier-controlleris set to be 10 seconds. - The deployment has specified CPU and memory resource limits.
- The deployment has 3 replicas.
-
The
example-label: labellabel is added. -
The
example-annotation: annotationannotation is added. -
The
nodeSelectorfield is set to select nodes with thedisktype: hddlabel.
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
- 1
- You can use the
readinessandlivenessprobe 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, andtcpSocket.
Additional resources
