EX316 sample questions

Question 1

During a troubleshooting session, you observe that Virtual Machines are failing to start on a specific node. The `virt-handler` pod on that node is in a CrashLoopBackOff state. What is the primary role of the `virt-handler` component in the OpenShift Virtualization architecture?

Accepted Answer

It runs on every node to monitor the VM processes and communicate with libvirt to manage the VM lifecycle locally.

Answer

It provides the CNI plugin functionality specifically for connecting VMs to the pod network.

Answer

It serves as the API entry point for all virtualization-related REST calls from the web console.

Answer

It acts as the cluster-wide controller that watches for VirtualMachine objects and creates corresponding pods.

Question 2

You need to deploy the OpenShift Virtualization operator in a restricted network environment (air-gapped). Which of the following pre-requisite steps is absolutely critical before creating the Subscription object?

Accepted Answer

Mirror the operator images to a private registry and configure an ImageContentSourcePolicy (ICSP) or ImageDigestMirrorSet (IDMS).

Answer

Manually download the KubeVirt binaries and place them on all worker nodes.

Answer

Disable the Operator Lifecycle Manager (OLM) as it requires internet access to function.

Answer

Install the 'virtctl' binary on the bastion host used for deployment.

Question 3

A developer needs to access the text console of a Virtual Machine named `db-server` in the `prod-db` namespace to troubleshoot boot issues. The VM has no IP address assigned yet. Which command provides the most direct access to the serial console?

Accepted Answer

virtctl console db-server -n prod-db

Answer

oc debug vm/db-server -n prod-db

Answer

virtctl vnc db-server -n prod-db

Answer

oc exec -it db-server -n prod-db -- /bin/bash

Question 4

You are creating a new Virtual Machine and want to upload a local RHEL 9 QCOW2 image directly to a DataVolume as part of the provisioning process. Which `virtctl` command structure achieves this?

Accepted Answer

virtctl image-upload dv rhel9-dv --size=20Gi --image-path=rhel9.qcow2 --storage-class=ocs-storagecluster-ceph-rbd

Answer

virtctl upload-image --source=rhel9.qcow2 --target-pvc=rhel9-pvc

Answer

oc cp rhel9.qcow2 default/virt-launcher-pod:/var/lib/images/

Answer

virtctl create vm --image=rhel9.qcow2 --volume-size=20Gi

Question 5

You have a `VirtualMachine` resource named `web-01`. You notice there is also a `VirtualMachineInstance` object named `web-01`. You delete the `VirtualMachineInstance` object using `oc delete vmi web-01`. What is the expected outcome?

Accepted Answer

The VM stops running, and the VirtualMachine controller immediately restarts it because the `runStrategy` (or `running: true`) dictates it should be running.

Answer

The VM stops running and the VirtualMachine resource is also deleted automatically.

Answer

The deletion fails because the VirtualMachine resource owns the VirtualMachineInstance.

Answer

The VM stops running and remains stopped until manually started again.

Question 6

Which TWO methods can be used to securely access the graphical display of a Windows Virtual Machine running in OpenShift Virtualization? (Select TWO)

Accepted Answer

Using `virtctl vnc` command to open a remote viewer session

Accepted Answer

Using the 'VNC Console' tab in the OpenShift Web Console

Answer

Using the Serial Console tab in the Web Console

Answer

Using `oc logs -f` to stream the graphical output

Free EX316 sample questions