RedHat EX280 시험

Red Hat Certified OpenShift Administrator exam 온라인 연습

최종 업데이트 시간: 2026년05월15일

당신은 온라인 연습 문제를 통해 RedHat EX280 시험지식에 대해 자신이 어떻게 알고 있는지 파악한 후 시험 참가 신청 여부를 결정할 수 있다.

시험을 100% 합격하고 시험 준비 시간을 35% 절약하기를 바라며 EX280 덤프 (최신 실제 시험 문제)를 사용 선택하여 현재 최신 360개의 시험 문제와 답을 포함하십시오.

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Question No : 1

SIMULATION
Configure a secure route
Configure the oxcart application in the area51 project with the following requirements:
The application uses a route called oxcart
The application uses a CA signed certificate with the following subject fields:
/C=US/ST=NV/L=Hiko/O=CIA/OU=USAF/CN=classified.apps.domainxx.example.com The application is reachable only at the following address: https://classified.apps.domainxx.example.com
The application produces output
A utility script called newcert has been provided to create the CA signed certificate. You may enter the certificate parameters manually or pass the subject as a parameter.
Your certificate signing request will be uploaded to the CA where it will immediately be signed and then downloaded to your current directory.

정답: Solution:
$ oc project area51
$ oc get pods
$ oc get all | grep deployment
$ oc get route
$ oc delete route oxcart
$ openssl genrsa -out ex280.key 2048
$ openssl req -new -key ex280.key -out ex280.csr -subj "/C=US/ST=NV/L=Hiko/O=CIA/OU=USAF/CN=classified.apps.domainxx.example.com"
$ openssl x509 -req -in ex280.csr -signkey ex280.key -out ex280.crt
$ oc create route edge oxcart --service oxcart --key ex280.key --cert ex280.crt --hostname classified.apps.domainxx.example.com
$ oc get route
$ oc get svc

Question No : 2

SIMULATION
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

정답: 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

Question No : 3

SIMULATION
Scale an application manually
Manually scale the minion application in the gru project to a total of 5 replicas.

정답: Solution:
$ oc project gru
$ oc get pods
$ oc get all | grep deployment
$ oc scale --replicas=5 deployment.apps/minion
$ oc get pods

Question No : 4

SIMULATION
Deploy an application
Deploy the application called rocky in the bullwinkle project so that the following conditions are true:
The application is reachable at the following address: http://rocky.apps.domainXX.example.com
The application produces output

정답: Solution:
$ oc project bullwinkle
$ oc get pods
$ oc get all | grep deploy
$ oc get nodes
$ oc describe nodes | grep -i taint
$ oc adm taint nodes worker0 key1=value1:NoSchedule-
$ oc adm taint nodes worker1 key1=value1:NoSchedule-
$ oc describe nodes | grep -i taint
$ oc get route
$ oc delete route rocky
$ oc expose svc rocky --hostname rocky.apps.domainxx.example.com $ oc get route

Question No : 5

SIMULATION
Configure limits
Configure your OpenShift cluster to use limits in the bluebook project with the following requirements:
The name of the LimitRange resource is: ex280-limits
The amount of memory consumed by a single pod is between 5Mi and 300Mi
The amount of memory consumed by a single container is between 5Mi and 300Mi with a default request value of 100Mi
The amount of CPU consumed by a single pod is between 10m and 500m
The amount of CPU consumed by a single container is between 10m and 500m with a default request value of 100m

정답: Solution:
$ vim limit.yaml
# Edit the yaml file like below mentioned
apiVersion: "v1" kind: "LimitRange" metadata:
name: "resource-limits" spec:
limits:
- type: "Pod"
max:
cpu: "500m" memory: "300Mi"
min:
cpu: "10m" memory: "5Mi"
- type: "Container" max:
cpu: "500m" memory: "300Mi"
min:
cpu: "10m" memory: "5Mi"
defaultRequest: cpu: "100m" memory: "100Mi"
$ oc create -f limit.yaml --save-config -n bluebook
$ oc describe limitranges -n bluebook

Question No : 6

SIMULATION
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

정답: Solution:
$ oc project manhattan
$ oc create quota ex280-quota --
hard=memory=1Gi,cpu=2,pods=3,services=6,replicationcontrollers=3
$ oc get resourcequota

Question No : 7

SIMULATION
Configure groups
Configure your OpenShift cluster to meet the following requirements: The user account armstrong is a member of the commander group The user account collins is a member of the pilot group
The user account aldrin is a member of the pilot group
Members of the commander group have edit permission in the apollo project Members of the pilot group have view permission in the apollo project

정답: Solution:
$ oc adm groups new commander
$ oc adm groups new pilot
$ oc adm groups add-users commander armstrong
$ oc adm groups add-users pilot collins
$ oc adm groups add-users pilot aldrin
$ oc adm policy add-role-to-group edit commander -n apollo $ oc adm policy add-role-to-group view pilot -n apollo

Question No : 8

SIMULATION
Configure project permissions
Configure your OpenShift cluster to meet the following requirements: The following projects exist:
apollo manhattan gemini bluebook titan
The user account armstrong is an administrator for project apollo and project gemini The user account wozniak can view project titan but not administer or delete it

정답: Solution:
$ oc new-project apollo
$ oc new-project manhattan
$ oc new-project gemini
$ oc new-project bluebook
$ oc new-project titan
$ oc adm policy add-role-to-user admin armstrong -n apollo
$ oc adm policy add-role-to-user admin armstrong -n gemini
$ oc adm policy add-role-to-user view wozniak -n titan

Question No : 9

SIMULATION
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

정답: 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

Question No : 10

SIMULATION
Configure an identity provider
Configure your OpenShift cluster to use an HTPasswd identity provider with the following requirements:
The name of the identity provider is: ex280-htpasswd The name of the secret is: ex280-idp-secret
The user account armstrong=indionce The user account collins=veraster The user account aldrin=roonkere The user account jobs=sestiver
The user account wozniak=glegunge

정답: Solution:
$ sudo yum install httpd-tools -y
$ htpasswd -c -B -b htpasswd-file-upload armstrong indionce
$ htpasswd -B -b htpasswd-file collins veraster
$ htpasswd -B -b htpasswd-file aldrin roonkere
$ htpasswd -B -b htpasswd-file jobs sestiver
$ htpasswd -B -b htpasswd-file wozniak glegunge
$ oc create secret generic ex280-idp-secret --from-file
htpasswd=htpasswd-file -n openshift-config
$ oc get oauth/cluster -o yaml> oauth.yaml
$ vim oauth.yaml
$
esc--> type :set paste --> enter --> insert --> then paste the content for correct indent pasting
spec:
identityProviders:
- name: ex280-htpasswd mappingMethod: claim type: HTPasswd htpasswd: fileData:
name: ex280-idp-secret
$ oc replace -f oauth.yaml
$ oc login -u armstrong -p indionce
$ oc login -u collins -p veraster
$ oc login -u aldrin roonkere
$ oc login -u jobs sestiver
$ oc login -u wozniak -p glegunge
#This below part of operation is completely optional and done just for handy login purpose $ alias _kube="oc login -u kubeadmin -p ${kube_pass} ${api_url}" $ alias _armstrong="oc login -u armstrong -p ${armstrong}
${api_url}"
$ alias _collins="oc login -u collins -p ${collins} ${api_url}"
$ alias _aldrin="oc login -u aldrin -p ${aldrin} ${api_url}"
$ alias _jobs="oc login -u jobs -p ${jobs} ${api_url}"
$ alias _wozniak="oc login -u wozniak -p ${wozniak} ${api_url}"
$ _armstrong;_armstrong;_collins;_aldrin;_jobs;_wozniak;

Question No : 11

Troubleshoot and fix a StatefulSet stuck in the Pending state due to insufficient persistent storage.