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  1. OpenShift Bugs
  2. OCPBUGS-35437

Kubeapi burst & QPS tuning

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      Description of problem:

      Since at least 4.12, the scalability & performance section of the doc state this incorrectly about the kubeAPIBurst & kubeAPIQPS settings:

      "The default client queries per second (QPS) and burst rates are currently [...]. These values cannot be modified in OpenShift Container Platform."

      In the NOTE in this section: https://docs.openshift.com/container-platform/4.15/scalability_and_performance/recommended-performance-scale-practices/recommended-control-plane-practices.html#recommended-scale-practices_recommended-control-plane-practices

       

      These values can in fact be modified, as recommended in two other sections:

      https://docs.openshift.com/container-platform/4.15/post_installation_configuration/machine-configuration-tasks.html#create-a-kubeletconfig-crd-to-edit-kubelet-parameters_post-install-machine-configuration-tasks

      https://docs.openshift.com/container-platform/4.15/post_installation_configuration/node-tasks.html#create-a-kubeletconfig-crd-to-edit-kubelet-parameters_post-install-node-tasks

      both state: " It is recommended to update the kubelet QPS and burst rates if there are enough CPU and memory resources on the node."

      Version-Release number of selected component (if applicable):

      4.12 - 4.15

      Additional info:

      RH slack convo: https://redhat-internal.slack.com/archives/CNKHL6076/p1718203473020359?thread_ts=1718203462.421769&cid=CNKHL6076

              rhn-support-jbrigman James Brigman
              jhopper@redhat.com Jenifer Abrams
              Liquan Cui Liquan Cui
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                Created:
                Updated: