Disable persistentReservations feature gate

MediumLevel 1Automatedopenshift-virt

Description

Persistentreservations are used to reserve a shared LUN among multiple virtual machines. This feature is required when the Windows guest makes use of the Windows Shared Cluster Filesystem. Enabling persistent reservations introduces additional complexity and overhead, as it requires calculated management of resource allocation and monitoring to ensure that reservations are not overcommitted and do not impact the overall performance of the system. Enabling the persistent reservations feature introduces and relies upon an optional component with elevated privileges (qemu - pr - helper). ... Audit: Passes when .spec.featureGates.persistentReservation is false or unset (the default is disabled). Requires oc logged in to the cluster with read access.

How it is checked

Audit method: Shell command

shell

command -v oc >/dev/null 2>&1 || exit 1; v=$(oc get hyperconverged kubevirt-hyperconverged -n openshift-cnv -o jsonpath='{.spec.featureGates.persistentReservation}') || exit 1; [ "$v" = true ] && echo noncompliant || echo compliant

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Disable the persistent reservations feature by setting to persistentReservations False for applicable hyperconverged resources. $ oc patch hyperconverged kubevirt - hyperconverged - n openshift - cnv -- type='json' -p='[ {"op": "replace", "path": "/spec/featureGates/persistentReservation", "value": false }, ]'

Properties

Operating systems: Any
Tags: openshift-virtfeature-gates
Reference: CIS Red Hat OpenShift Virtual Machine Extension Benchmark v1.0.0 - 1.3 Disable persistentReservations feature gate

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target openshift-virt