試験の準備方法-更新するCKA関連試験試験-認定するCKA試験勉強過去問

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Linux Foundation CKA Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Cluster Architecture, Installation & Configuration	25%	- Implement and configure a highly-available control plane - Understand CRDs, install and configure operators - Manage role based access control (RBAC) - Create and manage Kubernetes clusters using kubeadm - Understand extension interfaces (CNI, CSI, CRI, etc.) - Prepare underlying infrastructure for installing a Kubernetes cluster - Manage the lifecycle of Kubernetes clusters - Use Helm and Kustomize to install cluster components
Topic 2: Troubleshooting	30%	- Troubleshoot application failure - Troubleshoot networking - Troubleshoot cluster component failure - Manage container stdout & stderr logs - Understand how to monitor applications - Evaluate cluster and node logging
Topic 3: Workloads & Scheduling	15%	- Understand Static Pods - Understand Deployments and rolling update/rollback - Understand how to run multiple schedulers and configure scheduler policies - Use ConfigMaps and Secrets to configure applications - Use label selectors to schedule Pods - Understand resource limits and requests - Understand how scheduler works - Understand DaemonSets
Topic 4: Services & Networking	20%	- Define and enforce Network Policies - Know how to use Ingress controllers and Ingress resources - Understand and use CoreDNS - Use ClusterIP, NodePort, LoadBalancer service types and endpoints - Use the Gateway API to manage Ingress traffic - Understand connectivity between Pods
Topic 5: Storage	10%	- Understand Storage Classes and Persistent Volumes - Understand persistent volume claims primitive - Understand volume mode, access modes and reclaim policies - Understand how to configure applications with persistent storage

>> CKA関連試験 <<

CKA試験勉強過去問、CKA問題無料

多分、CKAテスト質問の数が伝統的な問題の数倍である。Linux Foundation　CKA試験参考書は全ての知識を含めて、全面的です。そして、CKA試験参考書の問題は本当の試験問題とだいたい同じことであるとわかります。CKA試験参考書があれば,ほかの試験参考書を勉強する必要がないです。

Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam 認定 CKA 試験問題 (Q18-Q23):

質問 # 18
You are setting up a Kubernetes cluster and you need to configure a NetworkPolicy to allow all traffic from pods in a specific namespace to other namespaces, but block all traffic from other namespaces to this specific namespace. How can you achieve this using NetworkPolicies?

正解：

解説：
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create a NetworkPolicy:
- Create a NetworkPolicy in the specific namespace where you want to restrict incoming traffic.
- Code:

2. Apply the NetworkPolicy: - Apply the NetworkPolicy using 'kubectl apply -f networkpolicy.yaml'

質問 # 19
List all the pods showing name and namespace with a json path expression

正解：

解説：
kubectl get pods -o=jsonpath="{.items[*]['metadata.name',
'metadata.namespace']}"

質問 # 20
Install a kubernetes cluster with one master and one worker using kubeadm

A. This is a straightforward question, you need to install kubernetes cluster using kubeadm with one master and one worker.
Refer : https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/
B. This is a straightforward question, you need to install kubernetes cluster using kubeadm with one master and one worker.
Installation is considered success once both master and worker
nodes become available.
Refer : https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/

正解：B

質問 # 21
Create and configure the service front-end-service so it's accessible through NodePort and routes to the existing pod named front-end.

正解：

解説：
solution

質問 # 22
You must connect to the correct host.
Failure to do so may result in a zero score.
[candidate@base] $ ssh Cka000059
Context
A kubeadm provisioned cluster was migrated to a new machine. It needs configuration changes to run successfully.
Task
Fix a single-node cluster that got broken during machine migration.
First, identify the broken cluster components and investigate what breaks them.
The decommissioned cluster used an external etcd server.
Next, fix the configuration of all broken cluster

正解：

解説：
Task Summary
* SSH into node: cka000059
* Cluster was migrated to a new machine
* It uses an external etcd server
* Identify and fix misconfigured components
* Bring the cluster back to a healthy state
Step-by-Step Solution
Step 1: SSH into the correct host
ssh cka000059
Step 2: Check the cluster status
Run:
kubectl get nodes
If it fails, the kubelet or kube-apiserver is likely broken.
Check kubelet status:
sudo systemctl status kubelet
Also, check pod statuses in the control plane:
sudo crictl ps -a | grep kube
or:
docker ps -a | grep kube
Look especially for failures in kube-apiserver or kube-controller-manager.
Step 3: Inspect the kube-apiserver manifest
Since this is a kubeadm-based cluster, manifests are in:
ls /etc/kubernetes/manifests
Open kube-apiserver.yaml:
bash
CopyEdit
sudo nano /etc/kubernetes/manifests/kube-apiserver.yaml
Look for the --etcd-servers= flag. If the external etcd endpoint has changed (likely, due to migration), this needs to be fixed.
Example of incorrect configuration:
--etcd-servers=https://192.168.1.100:2379
If the IP has changed, update it to the correct IP or hostname of the external etcd server.
Also ensure the correct client certificate and key paths are still valid:
--etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
--etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
--etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
If the files are missing or the path is wrong due to migration, correct those as well.
Step 4: Save and exit, and let static pod restart
Static pod changes will be picked up automatically by the kubelet (watch for /etc/kubernetes/manifests changes).
Check again:
docker ps | grep kube-apiserver
# or
crictl ps | grep kube-apiserver
Step 5: Confirm API is healthy
Once kube-apiserver is up, try:
kubectl get componentstatuses
kubectl get nodes
If these commands work and return valid statuses, the control plane is functional again.
Step 6: Check controller-manager and scheduler (optional)
If still broken, check the other static pods in /etc/kubernetes/manifests/ and correct paths if necessary.
Also verify that /etc/kubernetes/kubelet.conf and /etc/kubernetes/admin.conf are present and valid.
Command Summary
ssh cka000059
# Check system and kubelet
sudo systemctl status kubelet
docker ps -a | grep kube # or crictl ps -a | grep kube
# Check manifests
ls /etc/kubernetes/manifests
sudo nano /etc/kubernetes/manifests/kube-apiserver.yaml
# Fix --etcd-servers and certificate paths if needed
# Watch pods restart and confirm:
kubectl get nodes
kubectl get componentstatuses

質問 # 23
......

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