RedHat EX380 Antworten - EX380 Online Prüfungen

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RedHat EX380 Exam Syllabus Topics:

SectionWeightObjectives
Application Deployment and Management20%- Deploy and manage applications
  • 1. Manage Kubernetes resources on OpenShift
  • 2. Import/export applications and container images
  • 3. Work with image streams and registries
  • 4. Use Kustomize for configuration management
Automation and Scripting25%- Automate OpenShift operations
  • 1. Schedule tasks with CronJobs
  • 2. Create and use shell scripts for tasks
  • 3. Develop Ansible playbooks for cluster management
  • 4. Work with OpenShift REST API and CLI tools
Authentication and Identity Integration20%- Configure and manage OpenShift authentication
  • 1. Configure RBAC and custom roles
  • 2. Integrate with LDAP directory services
  • 3. Integrate with Red Hat SSO / Keycloak OIDC
  • 4. Manage user and group synchronization
Backup, Restore and Integration20%- Data protection and integration tasks
  • 1. Use OpenShift API for Data Protection (OADP)
  • 2. Backup and restore applications and cluster resources
  • 3. Integrate with external systems and services
  • 4. Manage cluster configuration and compliance
Operators and Extensions15%- Work with OpenShift Operators
  • 1. Install, subscribe, update and remove Operators
  • 2. Troubleshoot Operator deployments
  • 3. Use custom resources and controllers

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RedHat Red Hat Certified Specialist in OpenShift Automation and Integration EX380 Prüfungsfragen mit Lösungen (Q26-Q31):

26. Frage
Node Management - Remove Taint on Worker Node

Antwort:

Begründung:
See the solution below in Explanation:
Explanation:
Step 1: Log in to the OpenShift web console with an account that has sufficient cluster administrative privileges.
This Task is performed from the GUI, not the CLI. The lab hint explicitly places this under the worker node details page in the console.
Step 2: Navigate to Compute .
This area contains node-level resources, including control plane and worker nodes.
Step 3: Open Nodes .
Here you can view all nodes currently registered in the cluster.
Step 4: Select the required worker node .
Choose the exact worker node referenced by the lab Task SIMULATION .
Step 5: Open the Details tab.
The taint configuration is managed from the selected node's details view.
Step 6: Locate the Taints section and click Edit .
A taint is used to control pod scheduling. If a worker has a taint, pods without matching tolerations may not schedule there.
Step 7: Remove the unwanted taint entry.
Removing the taint makes the worker eligible again for normal scheduling behavior, depending on the rest of the cluster policy.
Step 8: Click Save .
This commits the change so the node is updated and the scheduler can evaluate it without that taint.


27. Frage
Silence an alert in Alertmanager
Task Information : Create an Alertmanager silence for a noisy alert for 2 hours, then confirm it's silenced.

Antwort:

Begründung:
See the solution below in Explanation:
Explanation:
* Find the alert name and labels
* Web console: Observe # Alerts # click the alert to view label set.
* Open Alertmanager silences
* Observe # Alerting # Alertmanager # Silences # Create silence
* Explanation: Silences mute alerts matching label filters.
* Create the silence
* Add matcher: alertname = < ALERT_NAME >
* Duration: 2 hours
* Save.
* Verify the alert shows as silenced
* The alert should indicate it is silenced in the UI.


28. Frage
Create and apply a MachineConfig (set MOTD on workers)
Task Information : Create a MachineConfig that writes /etc/motd on worker nodes.

Antwort:

Begründung:
See the solution below in Explanation:
Explanation:
* Create the MachineConfig YAML (example content encoded in base64)
* apiVersion: machineconfiguration.openshift.io/v1
* kind: MachineConfig
* metadata:
* name: 99-worker-motd
* labels:
* machineconfiguration.openshift.io/role: worker
* spec:
* config:
* ignition:
* version: 3.2.0
* storage:
* files:
* - path: /etc/motd
* mode: 0644
* contents:
* source: data:text/plain;charset=utf-8;base64,VGhpcyBpcyBhIHdvcmtlciBub2RlLg==
* MachineConfig uses Ignition format; file content is typically base64.
* Apply it
* oc apply -f 99-worker-motd.yaml
* Watch worker MachineConfigPool roll out
* oc get mcp worker
* MCP will show Updating then Updated.
* Validate on a worker node (if you have node access)
* Confirm /etc/motd contains the expected text.


29. Frage
Recover a NotReady worker node (basic remediation workflow)
Task Information : Diagnose a NotReady worker node and restore it to Ready state using standard OpenShift admin workflow.

Antwort:

Begründung:
See the solution below in Explanation:
Explanation:
* Identify failing node and status
* oc get nodes
* Confirms which node is NotReady.
* Inspect node conditions and events
* oc describe node < worker >
* Shows kubelet condition issues (network, disk pressure, runtime, etc.).
* Check MachineConfigPool state
* oc get mcp
* oc describe mcp worker
* If MCP is degraded, node may be stuck applying a config.
* Check node logs (kubelet)
* oc adm node-logs < worker > --path=kubelet.log
* Often reveals why node isn't reporting Ready.
* Remediate based on symptom
* Examples:
* If out of disk: free space, then verify kubelet recovers.
* If stuck MCO: investigate current/desired config and fix broken MachineConfig.
* If node cordoned/drained incorrectly: uncordon after remediation.
* oc adm uncordon < worker >
* Confirm node returns Ready
* oc get node < worker >


30. Frage
Integrate OpenShift with Keycloak (OIDC)
Task Information : Add a Keycloak (RH SSO) OpenID Connect identity provider to OpenShift OAuth and verify redirect/login works.

Antwort:

Begründung:
See the solution below in Explanation:
Explanation:
* Collect Keycloak details
* Issuer URL (realm), client ID, and client secret.
* Confirm Keycloak client has correct redirect URI for OpenShift OAuth callback.
* Create a secret with the OIDC client secret
* oc -n openshift-config create secret generic keycloak-oidc-secret \
* --from-literal=clientSecret=' < SECRET > '
* OAuth reads the OIDC client secret from this secret.
* Edit OAuth and add OpenID provider
* oc edit oauth cluster
Add under spec.identityProviders:
- name: keycloak
mappingMethod: claim
type: OpenID
openID:
issuer: "https://keycloak.example.com/realms/ocp"
clientID: "openshift"
clientSecret:
name: keycloak-oidc-secret
claims:
preferredUsername: ["preferred_username"]
name: ["name"]
email: ["email"]
* issuer must match Keycloak realm issuer URL.
* claims determines which token claims map to OpenShift username/name/email.
* Restart OAuth pods
* oc -n openshift-authentication delete pod -l app=oauth-openshift
* Verify by logging in through the web console
* You should be redirected to Keycloak, authenticate, then return to OpenShift.
* Confirm users/identities:
* oc get users
* oc get identities


31. Frage
......

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