4.9. Allocating specific CPUs for nodes in a cluster

Procedure

1. Obtain the label associated with the machine config pool (MCP) for the type of node you want to configure:

   $ oc describe machineconfigpool <name>

   Copy to Clipboard Toggle word wrap

   For example:

   $ oc describe machineconfigpool worker

   Copy to Clipboard Toggle word wrap

   Example output

   Name:         worker
   Namespace:
   Labels:       machineconfiguration.openshift.io/mco-built-in=
                 pools.operator.machineconfiguration.openshift.io/worker= 

   1

   
   Annotations:  <none>
   API Version:  machineconfiguration.openshift.io/v1
   Kind:         MachineConfigPool
   ...

   Copy to Clipboard Toggle word wrap

   1

   Get the MCP label.

2. Create a YAML file for the KubeletConfig CR:

   apiVersion: machineconfiguration.openshift.io/v1
   kind: KubeletConfig
   metadata:
     name: set-reserved-cpus 

   1

   
   spec:
     kubeletConfig:
       reservedSystemCPUs: "0,1,2,3" 

   2

   
     machineConfigPoolSelector:
       matchLabels:
         pools.operator.machineconfiguration.openshift.io/worker: "" 

   3

   Copy to Clipboard Toggle word wrap

   1

   Specify a name for the CR.

   2

   Specify the core IDs of the CPUs you want to reserve for the nodes associated with the MCP.

   3

   Specify the label from the MCP.

3. Create the CR object:

   $ oc create -f <file_name>.yaml

   Copy to Clipboard Toggle word wrap