13.5.4. Configuring KSM activation by using the CLI

Procedure

1. Open the HyperConverged CR in your default editor by running the following command:

   $ oc edit hyperconverged kubevirt-hyperconverged -n openshift-cnv

2. Edit the ksmConfiguration stanza:

   • To enable the KSM activation feature for all nodes, set the nodeLabelSelector value to {}. For example:

     apiVersion: hco.kubevirt.io/v1beta1
     kind: HyperConverged
     metadata:
       name: kubevirt-hyperconverged
       namespace: openshift-cnv
     spec:
       configuration:
         ksmConfiguration:
           nodeLabelSelector: {}
     # ...

   • To enable the KSM activation feature on a subset of nodes, edit the nodeLabelSelector field. Add syntax that matches the nodes where you want OpenShift Virtualization to enable KSM. For example, the following configuration allows OpenShift Virtualization to enable KSM on nodes where both <first_example_key> and <second_example_key> are set to "true":

     apiVersion: hco.kubevirt.io/v1beta1
     kind: HyperConverged
     metadata:
       name: kubevirt-hyperconverged
       namespace: openshift-cnv
     spec:
       configuration:
         ksmConfiguration:
           nodeLabelSelector:
             matchLabels:
               <first_example_key>: "true"
               <second_example_key>: "true"
     # ...

   • To disable the KSM activation feature, delete the ksmConfiguration stanza. For example:

     apiVersion: hco.kubevirt.io/v1beta1
     kind: HyperConverged
     metadata:
       name: kubevirt-hyperconverged
       namespace: openshift-cnv
     spec:
       configuration:
     # ...

3. Save the file.