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RedHat EX280 Exam Syllabus Topics:

SectionObjectives
Networking and Ingress- Cluster networking
  • 1. Configure routes and ingress resources
    • 2. Troubleshoot network connectivity
      Security and Troubleshooting- Troubleshooting
      • 1. Analyze logs and events
        • 2. Diagnose cluster and application issues
          - Security management
          • 1. Configure authentication and authorization
            • 2. Manage SCC (Security Context Constraints)
              OpenShift Cluster Installation and Configuration- Cluster setup and installation verification
              • 1. Install OpenShift clusters using installer-provisioned infrastructure
                • 2. Validate cluster health and components
                  Storage and Persistence- Persistent storage configuration
                  • 1. Configure storage classes
                    • 2. Provision persistent volumes and claims
                      Cluster Administration- Resource management
                      • 1. Manage projects, quotas, and limits
                        • 2. Deploy and manage applications
                          - User and role management
                          • 1. Manage cluster roles and bindings
                            • 2. Configure users, groups, and RBAC

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                              RedHat Red Hat Certified Specialist in OpenShift Administration exam 認定 EX280 試験問題 (Q19-Q24):

                              質問 # 19
                              Managing Group
                              Task information Details:
                              Create the groups site-users and guest-users .
                              Add qwerty to guest-users .
                              Add harry and susan to site-users .
                              Grant edit to site-users on test .
                              Grant view to guest-users on demo .

                              正解：

                              解説：
                              See the solution below in Explanation.
                              Explanation:
                              Solution:
                              * Create the groups:
                              oc adm groups new site-users
                              oc adm groups new guest-users
                              * Add users to groups:
                              oc adm groups add-users guest-users qwerty
                              oc adm groups add-users site-users harry susan
                              * Grant edit role on test to site-users:
                              oc policy add-role-to-group edit site-users -n test
                              * Grant view role on demo to guest-users:
                              oc policy add-role-to-group view guest-users -n demo
                              * Verify:
                              oc get groups
                              oc describe group site-users
                              oc describe group guest-users
                              oc get rolebinding -n test
                              oc get rolebinding -n demo
                              This task measures practical administration of OpenShift groups and project-scoped RBAC assignments.


                              質問 # 20
                              Start a Probe in Project Start
                              Task information Details:
                              Add a Liveness Probe to the deployment in project start using the Web Console.

                              正解：

                              解説：
                              See the solution below in Explanation.
                              Explanation:
                              Solution:
                              * Open the Web Console.
                              * Switch to project start .
                              * Navigate to: Workloads # Deployments
                              * Select the target deployment.
                              * Click the action menu and choose: Add Health Checks
                              * Select Liveness Probe .
                              * Configure the appropriate probe type:
                              * HTTP
                              * TCP
                              * or Command
                              * Enter the required endpoint or command based on the application.
                              * Save the configuration.
                              * Verify the deployment updates successfully and the pod status remains healthy.
                              CLI alternative if needed:
                              oc set probe deployment/ < deployment-name >
                              --liveness --get-url=http://:8080/ --initial-delay-seconds=10
                              This task measures health-check configuration for workload self-recovery.


                              質問 # 21
                              Configure cluster permissions
                              Configure your OpenShift cluster to meet the following requirements: The user account jobs can perform cluster administration tasks The user account wozniak can create projects The user account wozniak cannot perform cluster administration tasks The user account armstrong cannot create projects The user account kubeadmin is not present

                              正解：

                              解説：
                              See the solution below in Explanation.
                              Explanation:
                              Solution:
                              $ oc adm policy add-cluster-role-to-user cluster-admin jobs
                              $ oc adm policy remove-cluster-role-from-group self-provisioner
                              system:authenticated:oauth
                              $ oc adm policy add-cluster-role-to-user self-provisioner wozniak
                              $ oc delete secret kubeadmin -n kube-system


                              質問 # 22
                              Create Resource Quota for Project Rocky
                              Task information Details:
                              Use project rocky and create a quota named rocky-quota with limits for CPU, memory, pods, services, replication controllers, and secrets.

                              正解：

                              解説：
                              See the solution below in Explanation.
                              Explanation:
                              Solution:
                              * Ensure the project exists and switch to it:
                              oc new-project rocky
                              oc project rocky
                              * Create the quota:
                              oc create quota rocky-quota \
                              --hard=limits.cpu=2,limits.memory=1Gi,pods=3,services=6,replicationcontrollers=6,secrets=6
                              * Verify:
                              oc get resourcequota -n rocky
                              oc describe quota rocky-quota -n rocky
                              Notes:
                              * The lab text uses cpu=2,memory=1G and secret=6; in real OpenShift usage, the more reliable forms are limits.cpu, limits.memory, and secrets.
                              * If the exam specifically expects the exact resource names shown in the lab environment, use what the cluster accepts.
                              This task checks quota enforcement and namespace resource governance.


                              質問 # 23
                              Configure a secret
                              Configure a secret in the math project with the following requirements: The name of the secret is: magic The secret defines a key with name: decoder_ring The secret defines the key with value:
                              XpWy9KdcP3Tr9FFHGQgZgVRCKukQdrQsbcl0c2ZYhDk=

                              正解：

                              解説：
                              See the solution below in Explanation.
                              Explanation:
                              Solution:
                              $ oc project math
                              $ oc create secret generic magic --from-literal key=decoder_ring --from- literal value=XpWy9KdcP3Tr9FFHGQgZgVRCKukQdrQsbcl0c2ZYhDk=
                              $ oc get secret -n math


                              質問 # 24
                              ......

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