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紅帽EX280（紅帽認證OpenShift管理專家）認證考試旨在為希望展示其OpenShift管理技術專業的IT專業人士設計。OpenShift是一個容器應用程序平台，有助於自動化應用程序的部署、擴展和管理。隨著越來越多的組織尋求採用容器化，對OpenShift管理員的需求急劇增加。該認證考試提供了一種標準化的方式來證明個人在OpenShift管理方面的知識和技能。
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Red Hat Certified Specialist in OpenShift Administration（EX280）認證考試是旨在驗證候選人在管理和管理Red Hat OpenShift容器平台所需的技能和知識。該考試適用于具有Red Hat OpenShift容器平台經驗並負責管理、配置和疑難排解OpenShift集群的專業人士。該認證被認為是IT行業中一個有價值的證書，對于想要在OpenShift管理方面提升職業生涯的專業人士來說，這是一項必不可少的認證。
EX280 考試測試候選人在各種 OpenShift 管理主題上的知識和技能，包括應用程序部署、擴展和故障排除。該考試旨在評估候選人在使用 OpenShift 集群、配置和管理用戶和群組、設置網絡和存儲解決方案方面的能力。考試還測試候選人在保護 OpenShift 集群和實施容器安全方面的技能。
問題 #16
Deploy Application in the Project QED
Task information Details:
Set the service account for the specified deployment in project qed to project1-sa .
答案：
解題說明：
See the solution below in Explanation.
Explanation:
Solution:
* Ensure you are in the correct project:
oc project qed
* Set the service account on the deployment:
oc set serviceaccount deployment/gitlab-skdjfklj project1-sa
* Verify:
oc get deployment gitlab-skdjfklj -o yaml | grep serviceAccount
oc describe deployment gitlab-skdjfklj
* If required, restart rollout:
oc rollout restart deployment/gitlab-skdjfklj
This task checks workload identity assignment through service accounts.
問題 #17
Scale an application manually
Manually scale the minion application in the gru project to a total of 5 replicas.
答案：
解題說明：
See the solution below in Explanation.
Explanation:
Solution:
$ oc project gru
$ oc get pods
$ oc get all | grep deployment
$ oc scale --replicas=5 deployment.apps/minion
$ oc get pods
問題 #18
Create LimitRanges for Project Darpa
Task information Details:
Switch to project darpa and create a LimitRange with Pod and Container minimums and maximums of CPU and memory, plus default container values.
答案：
解題說明：
See the solution below in Explanation.
Explanation:
Solution:
* Switch to the target project:
oc project darpa
* Create a YAML file, for example limitrange.yaml:
apiVersion: v1
kind: LimitRange
metadata:
name: darpa-limits
namespace: darpa
spec:
limits:
- type: Pod
max:
cpu: 300m
memory: 300Mi
min:
cpu: 5m
memory: 5Mi
- type: Container
max:
cpu: 300m
memory: 300Mi
min:
cpu: 5m
memory: 5Mi
default:
cpu: 100m
memory: 100Mi
* Apply it:
oc apply -f limitrange.yaml
* Verify:
oc get limitrange -n darpa
oc describe limitrange darpa-limits -n darpa
This task validates namespace-level defaulting and constraint policies for pod scheduling and resource consumption.
問題 #19
Scale an application automatically
Automatically scale the hydra application deployment configuration in the lerna project with the following requirements:
Minimum number of replicas: 6 Maximum number of replicas: 9
Target average CPU utilization: 60 percent Container CPU resource request: 25m Container CPU resource limit: 100m
答案：
解題說明：
See the solution below in Explanation.
Explanation:
Solution:
$ oc project lerna
$ oc get pods
$ oc get all | grep deployment
$ oc autoscale deployment.apps/hydra --max=9 --min=6 --cpu-percent=60
$ oc get hpa
$ oc set resources deployment.apps/hydra --limits=cpu=100m -- requests=cpu=25m
$ oc describe deployment.apps/hydra | grep Limits -A3
問題 #20
Configure quotas
Configure your OpenShift cluster to use quotas in the manhattan project with the following requirements:
The name of the ResourceQuota resource is: ex280-quota
The amount of memory consumed across all containers may not exceed 1Gi
The total amount of CPU usage consumed across all containers may not exceed
2 full cores
The maximum number of replication controllers does not exceed 3 The maximum number of pods does not exceed 3 The maximum number of services does not exceed 6
答案：
解題說明：
See the solution below in Explanation.
Explanation:
Solution:
$ oc project manhattan
$ oc create quota ex280-quota -- hard=memory=1Gi,cpu=2,pods=3,services=6,replicationcontrollers=3
$ oc get resourcequota
問題 #21
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