PERF_ENHANCEMENTS.md

Performance Enhancements

Try out some performance enhancements for your SNO cluster.

• Encapsulating mount namespaces

  • https://docs.openshift.com/container-platform/4.13/scalability_and_performance/optimization/optimizing-cpu-usage.html

• Configuring crun as the default container runtime

  • https://docs.openshift.com/container-platform/4.13/scalability_and_performance/ztp_far_edge/ztp-reference-cluster-configuration-for-vdu.html#ztp-sno-du-configuring-crun-container-runtime_sno-configure-for-vdu

• 500 pods

Run this post install.

cat <<EOF | oc apply -f -
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: master
  name: 99-kubens-master
spec:
  config:
    ignition:
      version: 3.2.0
    systemd:
      units:
      - enabled: true
        name: kubens.service
---
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: worker
  name: 99-kubens-worker
spec:
  config:
    ignition:
      version: 3.2.0
    systemd:
      units:
      - enabled: true
        name: kubens.service
---
apiVersion: machineconfiguration.openshift.io/v1
kind: ContainerRuntimeConfig
metadata:
 name: enable-crun-master
spec:
 machineConfigPoolSelector:
   matchLabels:
     pools.operator.machineconfiguration.openshift.io/master: ""
 containerRuntimeConfig:
   defaultRuntime: crun
---
apiVersion: machineconfiguration.openshift.io/v1
kind: ContainerRuntimeConfig
metadata:
 name: enable-crun-worker
spec:
 machineConfigPoolSelector:
   matchLabels:
     pools.operator.machineconfiguration.openshift.io/worker: ""
 containerRuntimeConfig:
   defaultRuntime: crun
---
apiVersion: machineconfiguration.openshift.io/v1
kind: KubeletConfig
metadata:
  name: set-max-pods
spec:
  machineConfigPoolSelector:
    matchLabels:
      custom-kubelet: large-pods
  kubeletConfig:
    podsPerCore: 0
    maxPods: 500
---
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
  labels:
    custom-kubelet: large-pods
  name: master
EOF