Chapter 13. Configuring burst and QPS for net-kourier

The queries per second (QPS) value determines the number of client requests or API calls that are sent to the API server.

The burst value determines how many requests from the client can be stored for processing. Requests exceeding this buffer will be dropped. 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" 1
      - name: KUBE_API_QPS
        value: "200" 2