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Linux Foundation CKA Exam Syllabus Topics:

Section	Weight	Objectives
Services & Networking	20%	- Ingress configuration - Services (ClusterIP, NodePort, LoadBalancer) - Network policies
Troubleshooting	30%	- Cluster component troubleshooting - Application and networking debugging
Cluster Architecture, Installation & Configuration	25%	- Cluster installation and configuration - High availability setup - Kubernetes architecture components
Workloads & Scheduling	15%	- ConfigMaps and Secrets - Scheduling constraints - Deployments and rolling updates
Storage	10%	- PersistentVolumes and PersistentVolumeClaims - Storage classes

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高品質なCKAテキスト一回合格-100％合格率のCKA日本語学習内容

すべての顧客の誠実な要件を考慮して、CKAテスト問題は「品質第一とクライアント最高」の原則に沿って持続し、高品質の製品を豊富に備えた候補者に約束します。試験での99％の合格率、購入前の無料試用版など、CKAトレーニング資料の多数の利点がよく知られています。お客様の観点から、当社のCKAテスト問題では、すべての候補者の要求が最優先事項となっています。最適なCKA模擬テストに対するお客様の信頼とフィードバックを大切にしています。

Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam 認定 CKA 試験問題 (Q20-Q25):

質問 # 20
You are deploying a new microservice to your Kubernetes cluster. This service needs to communicate with another service within the same cluster. You want to ensure that the communication between the two services is secure and reliable. Which container network interface plugin would you choose for this scenario and why?

正解：

解説：
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Choose the appropriate Container Network Interface Plugin:
- For secure and reliable communication between services within the same Kubernetes cluster, the Calico container network interface plugin is a recommended choice.
2. Reasons for choosing Calico:
- Security: Calico provides robust network security features like network policies that allow you to define fine- grained access control rules between pods and services. This ensures secure communication only between authorized entities.
- Reliability: Calico offers high availability and reliability. It uses a distributed architecture and supports BGP for efficient routing and load balancing, leading to resilient network connectivity.
- Ease of Use: Calico integrates seamlessly with Kubernetes and is easy to configure and manage.
- Scalability: It's highly scalable, enabling you to manage large and complex Kubernetes environments.
3. Example Implementation:
- Install Calico: Use the 'kubectl' command to install Calico on your Kubernetes cluster:
kubectl apply -f https://docs.projectcalico.org/v3.19/getting-
started/kubernetes/installation/l .8+/manifests/calico.yaml
- Define Network Policies: Create network policies to control communication between your services. Here's an example:

This policy allows pods labeled 'app: microservice? to communicate with pods labeled 'app: microservice? within the 'default' namespace. 4. Verify the Configuration: - Use 'kubectl get networkpolicies' to list the defined network policies. - Test communication between your services. Note: Calico is a popular and highly regarded choice for Kubernetes networking. However, other plugins like Flannel and Weave are also viable options, depending on your specific requirements and preferences. ,

質問 # 21
Create a PersistentVolumeClaim of at least 3Gi storage and access mode ReadWriteOnce and verify status is Bound

A. vim task-pv-claim.yaml
apiVersion: v2
kind: PersistentVolumeClaim
metadata:
name: task-pv-claim
spec:
storageClassName: ""
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 4Gi
kubectl apply -f task-pv-claim.yaml
//Verify
kubectl get pv
NAME CAPACITY ACCESS
MODES RECLAIM POLICY STATUS CLAIM
STORAGECLASS REASON AGE
task-pv-volume 4Gi RWO
Retain Bound default/task-pv-claim
6m16s
kubectl get pvc
NAME STATUS VOLUME
CAPACITY ACCESS MODES STORAGECLASS AGE
task-pv-claim Bound task-pv-volume
5Gi RWO 6s
B. vim task-pv-claim.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: task-pv-claim
spec:
storageClassName: ""
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi
kubectl apply -f task-pv-claim.yaml
//Verify
kubectl get pv
NAME CAPACITY ACCESS
MODES RECLAIM POLICY STATUS CLAIM
STORAGECLASS REASON AGE
task-pv-volume 5Gi RWO
Retain Bound default/task-pv-claim
6m16s
kubectl get pvc
NAME STATUS VOLUME
CAPACITY ACCESS MODES STORAGECLASS AGE
task-pv-claim Bound task-pv-volume
5Gi RWO 6s

正解：B

質問 # 22
Score: 5%

Task
From the pod label name=cpu-utilizer, find pods running high CPU workloads and write the name of the pod consuming most CPU to the file /opt/KUTR00401/KUTR00401.txt (which already exists).

正解：

解説：
See the solution below.
Explanation
Solution:
kubectl top -l name=cpu-user -A
echo 'pod name' >> /opt/KUT00401/KUT00401.txt

質問 # 23
Create a Kubernetes secret as follows:
* Name: super-secret
* password: bob
Create a pod named pod-secrets-via-file, using the redis Image, which mounts a secret named super-secret at
/secrets.

正解：

解説：
Create a second pod named pod-secrets-via-env, using the redis Image, which exports password as CONFIDENTIAL See the solution below.
Explanation
solution

質問 # 24
Get the DNS records for the service and pods for the deployment redis and the put the value in /tmp/dnsrecordpod and /tmp/dnsrecord-service

A. // Get Pod Ip
kubectl get po -o wide
// Get Service Name
kubectl get svc
// Create a temporary pod and execute nslookup command
Note: POD IP format should be a-b-c-d and not a.b.c.d
kubectl run busybox --image=busybox:1.28 --restart=Never -
-rm -it -- nslookup 192-168-0-69.default.pod >
/tmp/dnsrecord-pod
kubectl run busybox1 --image=busybox:1.28 --restart=Never
--rm -it -- nslookup redis-service > /tmp/dnsrecordservice
//Verify
cat /tmp/dnsrecord-pod
Server: 10.2.0.10
Address 1: 10.2.0.10 kube-dns.kube system.svc.cluster.local Name: 192-168-0-69.default.pod Address 1: 192.168.0.69 192-168-0-69.redis service.default.svc.cluster.local cat /tmp/dnsrecord-pod Server: 10.2.0.10 Address 1: 10.2.0.10 kube-dns.kube system.svc.cluster.local Name: 192-168-0-69.default.pod Address 1: 192.168.0.69 192-168-0-69.redis service.default.svc.cluster.local
B. // Get Pod Ip
kubectl get po -o wide
// Get Service Name
kubectl get svc
// Create a temporary pod and execute nslookup command
Note: POD IP format should be a-b-c-d and not a.b.c.d
kubectl run busybox --image=busybox:1.28 --restart=Never -
-rm -it -- nslookup 192-168-0-69.default.pod >
/tmp/dnsrecord-pod
kubectl run busybox1 --image=busybox:1.26 --restart=Never
--rm -it -- nslookup redis-service > /tmp/dnsrecordservice
//Verify
cat /tmp/dnsrecord-pod
Server: 10.2.8.10
Address 1: 10.2.0.10 kube-dns.kube system.svc.cluster.local Name: 192-168-0-69.default.pod Address 1: 192.168.0.69 192-166-0-69.redis service.default.svc.cluster.local cat /tmp/dnsrecord-pod Server: 10.2.0.10 Address 1: 10.2.0.10 kube-dns.kube system.svc.cluster.local Name: 192-168-0-69.default.pod Address 1: 192.168.0.69 192-168-0-69.redis service.default.svc.cluster.local

正解：A

質問 # 25
......

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