Disable overcommitting guest memory

MoyenneNiveau 1Revue manuelleopenshift-virt

Description

The overcommitGuestOverhead configuration option enables the request for additional virtual machine management memory inside the virt - launcher pod. The overcommit feature is used to increase virtual machine density on the node, as long as the virtual machine doesn’t request all the memory that it would need if fully loaded. However, if the VM were to use all of the memory it could, this would lead to the OpenShift Scheduler killing the workload. The benchmark marks this recommendation Manual; TMAegis reports it as a manual review item with the audit steps.

Méthode de vérification

Méthode d'audit: Revue manuelle

Cette recommandation ne peut pas être vérifiée automatiquement. Une analyse la liste avec ces instructions lorsque vous passez --include-manual.

Verify that no virtual machines are using the overcommitGuestOverhead setting: $ oc get vm - ojson - A |jq '.items[] | select(.spec.template.spec.domain.resources.overcommitGuestOverhead == true)| .metadata.namespace + "/" + .metadata.name'

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Stop any guest with this flag enabled and remove the flag before restarting. This flag can be removed on a given VM with the following command: $ oc patch vm <vm-name> --type='json' -p='[ {"op": "remove", "path": "/spec/template/spec/domain/resources/overcommitGuestOverhead"}, ]'

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: openshift-virtmanual-review
Référence: CIS Red Hat OpenShift Virtual Machine Extension Benchmark v1.0.0 - 2.2 Disable overcommitting guest memory