William Thomas William Thomas
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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam čŖå® CKA 試éØåé” (Q84-Q89):
č³Ŗå # 84
What are the differences between using a service versus using an application for Security Policy match?
- A. Use of a "service" enables the firewall to take immediate action with the first observed packet based on port numbers. Use of an application allows the firewall to take action after enough packets allow for App-ID identification regardless of the ports being used
- B. There are no differences between "service" or "application." Use of an "application simplifies configuration by allowing use of a friendly application name instead of port numbers.
- C. Use of a "service" enables the firewall to take action after enough packets allow for App-ID identification
- D. Use of a "service" enables the firewall to take immediate action with the first observed packet based on port numbers. Use of an "application allows the firewall to take immediate action if the port being used is a member of the application standard port list
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č³Ŗå # 85
Create a pod named kucc8 with a single app container for each of the following images running inside (there may be between 1 and 4 images specified):
nginx + redis + memcached.
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解説ļ¼
solution
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č³Ŗå # 86
Create an nginx pod with containerPort 80 and it should check the pod running at endpoint / healthz on port 80 and verify and delete the pod.
- A. kubectl run nginx --image=nginx --restart=Always --port=80 --
dry-run -o yaml > nginx-pod.yaml
// add the livenessProbe section and create
apiVersion: v1
kind: Pod
metadata:
labels:
containers:
- image: nginx
name: nginx
ports:
- containerPort: 60
livenessProbe:
httpGet:
path: /healthz
port: 60
restartPolicy: Always
kubectl create -f nginx-pod.yaml
// verify
kubectl describe pod nginx | grep -i readiness
kubectl delete po nginx - B. kubectl run nginx --image=nginx --restart=Always --port=80 --
dry-run -o yaml > nginx-pod.yaml
// add the livenessProbe section and create
apiVersion: v1
kind: Pod
metadata:
labels:
run: nginx
name: nginx
spec:
containers:
- image: nginx
name: nginx
ports:
- containerPort: 80
livenessProbe:
httpGet:
path: /healthz
port: 80
restartPolicy: Always
kubectl create -f nginx-pod.yaml
// verify
kubectl describe pod nginx | grep -i readiness
kubectl delete po nginx
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Ā
č³Ŗå # 87
You are deploying a service in Kubernetes that needs to access a database service running in a different namespace. How can you configure NetworkPolicy to allow communication between these services across namespaces?
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解説ļ¼
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create a NetworkPolicy in the service's namespace:
- Create a NetworkPolicy in the namespace of the service that needs to access the database.
- Code:
2. Ensure the Database Namespace has the Correct Label: - Ensure that the namespace where the database service is running has the label 'database: true'. 3. Apply the NetworkPolicy: - Apply the NetworkPolicy using 'kubectl apply -f networkpolicy.yaml'.
Ā
č³Ŗå # 88
You must connect to the correct host.
Failure to do so may result in a zero score.
[candidate@base] $ ssh Cka000055
Task
Verify the cert-manager application which has been deployed to your cluster .
Using kubectl, create a list of all cert-manager Custom Resource Definitions (CRDs ) and save it to ~/resources.yaml .
You must use kubectl 's default output format.
Do not set an output format.
Failure to do so will result in a reduced score.
Using kubectl, extract the documentation for the subject specification field of the Certificate Custom Resource and save it to ~/subject.yaml.
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解説ļ¼
Task Summary
You need to:
* SSH into the correct node: cka000055
* Use kubectl to list all cert-manager CRDs, and save that list to ~/resources.yaml
* Do not use any output format flags like -o yaml
* Extract the documentation for the spec.subject field of the Certificate custom resource and save it to ~
/subject.yaml
Step-by-Step Instructions
Step 1: SSH into the node
ssh cka000055
Step 2: List cert-manager CRDs and save to a file
First, identify all cert-manager CRDs:
kubectl get crds | grep cert-manager
Then extract them without specifying an output format:
kubectl get crds | grep cert-manager | awk '{print $1}' | xargs kubectl get crd > ~/resources.yaml This saves the default kubectl get output to the required file without formatting flags.
Step 3: Get documentation for spec.subject in the Certificate CRD
Run the following command:
kubectl explain certificate.spec.subject > ~/subject.yaml
This extracts the field documentation and saves it to the specified file.
If you're not sure of the resource, verify it exists:
kubectl get crd certificates.cert-manager.io
Final Command Summary
ssh cka000055
kubectl get crds | grep cert-manager | awk '{print $1}' | xargs kubectl get crd > ~/resources.yaml kubectl explain certificate.spec.subject > ~/subject.yaml
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č³Ŗå # 89
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