EX280 Cluster Installation And Management Practice Test 5 — 15 Questions

Question 1

Which TWO namespaces are standard system namespaces in OpenShift 4.14 that contain core cluster operators and platform components? (Choose TWO)

Accepted Answer

openshift-cluster-version. openshift-cluster-version and openshift-machine-config-operator are core platform namespaces.

Answer

openshift-user-workloads

Answer

kube-public-custom

Answer

openshift-custom-catalog

Question 2

An administrator needs to identify worker nodes that require attention during an upgrade or maintenance. Which TWO conditions or states on a node object indicate potential issues or special maintenance states? (Choose TWO)

Accepted Answer

SchedulingDisabled. SchedulingDisabled (cordoned) and NotReady indicate maintenance or health issues on nodes.

Answer

Running=Normal

Answer

Active=True

Answer

Schedulable=True

Question 3

Which TWO methods can administrators use to access the OpenShift 4.14 web console or CLI for cluster management? (Choose TWO)

Accepted Answer

Using a web browser to access the OpenShift Web Console URL.. Administrators use the 'oc' CLI tool and the OpenShift web console URL.

Answer

Using 'systemctl gui-console' on control plane nodes.

Answer

Using SSH to log directly into the API server container runtime socket.

Answer

Using the 'kubectl-adm console' plugin.

Question 4

An administrator wants to modify the default kubelet parameters (such as maximum pods per core or eviction hard thresholds) across worker nodes. Which TWO steps or resources are involved in this process? (Choose TWO)

Accepted Answer

Create a KubeletConfig custom resource defining the desired kubelet parameters.. Kubelet configuration changes involve creating a KubeletConfig resource and ensuring its selector targets the correct MachineConfigPool.

Answer

Directly edit the kubelet.conf file on every node via SSH.

Answer

Restart the kubelet service manually on all nodes using systemctl.

Answer

Modify the ClusterVersion spec to include kubelet flags.

Question 5

An administrator is planning an OpenShift 4.14 cluster upgrade and wants to ensure that specific safety checks and conditions are met before proceeding. Which THREE conditions must be true for an upgrade to proceed smoothly? (Choose THREE)

Accepted Answer

All MachineConfigPools must be fully updated and not in a degraded state.. Cluster version updates require healthy operators (not degraded), available storage/compute resources, and a valid update path.

Answer

The cluster must be switched to the 'nightly' channel for all production upgrades.

Answer

All user-created namespaces must be temporarily deleted prior to upgrade.

Question 6

Which TWO objects are used by OLM to manage Operator catalogs and sources of software in OpenShift 4.14? (Choose TWO)

Accepted Answer

OperatorGroup. CatalogSource and OperatorGroup are key OLM components for catalog management and scoping.

Answer

ClusterVersion

Answer

MachineSet

Answer

MachineConfigPool

Question 7

An administrator wants to configure automated remediation for worker nodes that become unresponsive or experience hardware failure. Which TWO configurations or resources are required for a MachineHealthCheck to function properly? (Choose TWO)

Accepted Answer

Unhealthy conditions specifying the node status condition and timeout duration.. MachineHealthCheck requires target selectors (matchLabels) and node condition timeout definitions (unhealthyConditions).

Answer

A replica count specifying how many remediation pods to run.

Answer

A ContainerRuntimeConfig specifying reboot parameters.

Answer

An OperatorGroup defining the namespace for the health check.

Question 8

An administrator wants to prevent automatic updates for an Operator installed via OLM while still allowing manual installation of new versions when desired. Which TWO actions or configurations should be performed? (Choose TWO)

Accepted Answer

Approve generated InstallPlans selectively using 'oc patch installplan' or via the web console when an update is desired.. To prevent automatic updates, set installPlanApproval to Manual and approve install plans manually when ready.

Answer

Scale the OLM operator pods to zero.

Answer

Delete the CatalogSource resource entirely.

Answer

Annotate the Subscription with 'olm.openshift.io/block-updates=true'.

Question 9

Which TWO commands or tools can an administrator use to inspect cluster logs or events when troubleshooting node or pod issues? (Choose TWO)

Accepted Answer

oc logs <pod-name>. Administrators use 'oc logs' and 'oc get events' to investigate pod and cluster activities.

Answer

oc adm cluster-logs --tail=all

Answer

oc system-log dump

Answer

oc adm tail-events

Question 10

An administrator is examining the cluster architecture and core operators of OpenShift 4.14. Which THREE core operators run as part of the control plane and platform management? (Choose THREE)

Accepted Answer

Cluster Version Operator (CVO). Cluster Version Operator, Machine Config Operator, and Ingress Operator are core platform operators.

Answer

Cluster Autoscaler Operator

Answer

Operator Lifecycle Manager (OLM)

Question 11

An administrator is troubleshooting a custom MachineConfig that failed to apply across a worker MachineConfigPool. Which THREE diagnostic steps or resources should the administrator check? (Choose THREE)

Accepted Answer

Review the logs of the machine-config-daemon pods on the affected nodes.. To diagnose MachineConfig application failures, check pool status conditions, machine-config-daemon pod logs, and rendered MachineConfigs.

Answer

Check the Cluster Version Operator logs for container registry pull errors.

Answer

Verify the OLM CatalogSource status.

Question 12

Which TWO methods can an administrator use to view the nodes currently present in an OpenShift 4.14 cluster along with their roles and versions? (Choose TWO)

Accepted Answer

oc describe node <node-name>. Administrators use 'oc get nodes' and 'oc describe node' to inspect node inventory and details.

Answer

oc cluster-version nodes

Answer

oc get machineconfigpools --nodes

Answer

oc get clusteroperators --nodes

Question 13

An administrator wants to inspect or modify the OperatorGroup for a namespace in OpenShift 4.14. Which TWO characteristics or settings are defined by an OperatorGroup? (Choose TWO)

Accepted Answer

The target namespaces (targetNamespaces) where Operators in the group can manage workloads.. OperatorGroups define the target namespaces where OLM operators can be installed and operated.

Answer

The kernel version applied to worker nodes in the pool.

Answer

The cluster upgrade channel and target release version.

Answer

The cloud provider machine instance type (e.g., m5.xlarge).

Question 14

An administrator is managing cluster machine configurations and needs to understand how Ignition configuration files are processed. Which THREE statements are correct regarding Ignition and the Machine Config Operator in OpenShift 4.14? (Choose THREE)

Accepted Answer

The Machine Config Daemon runs on every node to apply updates delivered by the MCO.. Ignition provisions nodes on first boot, rendered MachineConfigs combine configs, and the Machine Config Daemon applies them.

Answer

Ignition files are stored directly inside etcd without encryption or serialization.

Answer

Ignition configs are dynamically parsed and executed continuously by a background daemon every 5 seconds during normal runtime.

Question 15

An administrator wants to check the status of Machine API provisioning and verify that all machines are in a running state. Which TWO commands or resource inspections should the administrator perform? (Choose TWO)

Accepted Answer

Run 'oc get machines -A' to list all provisioned machines across namespaces.. Administrators inspect machines and machinesets using 'oc get machines' and 'oc get machinesets'.

Answer

Run 'oc adm machine-status'.

Answer

Run 'oc get clusteroperators --machines'.

Answer

Run 'oc get machineconfigpools --machines'.