Chapter 13. Configuring burst and QPS for net-kourier

The queries per second (QPS) value determines how many client requests or API calls a client sends to the API server each second.

The burst value determines how many client requests the system can store in a buffer for processing. If requests exceed this buffer, the system drops them. This is helpful for controllers that are bursty and do not spread their requests uniformly in time.

When the net-kourier-controller restarts, it parses all ingress resources deployed on the cluster, which leads to a significant number of API calls. Due to this, the net-kourier-controller can take a long time to start.

You can adjust the QPS and burst values for the net-kourier-controller in the KnativeServing CR:

apiVersion: operator.knative.dev/v1beta1
kind: KnativeServing
metadata:
  name: knative-serving
  namespace: knative-serving
spec:
  workloads:
  - name: net-kourier-controller
    env:
    - container: controller
      envVars:
      - name: KUBE_API_BURST
        value: "200" 

      - name: KUBE_API_QPS
        value: "200"