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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q68-Q73):

NEW QUESTION # 68
Score:7%

Context
An existing Pod needs to be integrated into the Kubernetes built-in logging architecture (e. g. kubectl logs).
Adding a streaming sidecar container is a good and common way to accomplish this requirement.
Task
Add a sidecar container named sidecar, using the busybox Image, to the existing Pod big-corp-app. The new sidecar container has to run the following command:
/bin/sh -c tail -n+1 -f /va r/log/big-corp-app.log
Use a Volume, mounted at /var/log, to make the log file big-corp-app.log available to the sidecar container.

Answer:

Explanation:
See the solution below.
Explanation
Solution:
#
kubectl get pod big-corp-app -o yaml
#
apiVersion: v1
kind: Pod
metadata:
name: big-corp-app
spec:
containers:
- name: big-corp-app
image: busybox
args:
- /bin/sh
- -c
- >
i=0;
while true;
do
echo "$(date) INFO $i" >> /var/log/big-corp-app.log;
i=$((i+1));
sleep 1;
done
volumeMounts:
- name: logs
mountPath: /var/log
- name: count-log-1
image: busybox
args: [/bin/sh, -c, 'tail -n+1 -f /var/log/big-corp-app.log']
volumeMounts:
- name: logs
mountPath: /var/log
volumes:
- name: logs
emptyDir: {
}
#
kubectl logs big-corp-app -c count-log-1

NEW QUESTION # 69
You have a deployment named 'my-app' running a web application that uses an external database service. You need to configure a 'ClusterlP' service to route traffic to the external database service.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create the ClusterlP service:
- Create a 'ClusterlP' service that points to the external database service using the 'externalName' field.

2. Apply the service: - Apply the YAML file using 'kubectl apply -f external-db-service.yamr 3. Verify the service: - Check the status of the service using 'kubectl get services external-db-service -n ' 4. Test the service: - From a pod in the same namespace as the service, try to connect to the external database service using the 'external-db-service' service name and port. Note: - Replace with the actual namespace. - Replace 'my-external-db.example.com' with the actual hostname of your external database service. - Ensure that your cluster has access to the external database service.

NEW QUESTION # 70
You must connect to the correct host.
Failure to do so may result in a zero score.
[candidate@base] $ ssh Cka000056
Task
Review and apply the appropriate NetworkPolicy from the provided YAML samples.
Ensure that the chosen NetworkPolicy is not overly permissive, but allows communication between the frontend and backend Deployments, which run in the frontend and backend namespaces respectively.
First, analyze the frontend and backend Deployments to determine the specific requirements for the NetworkPolicy that needs to be applied.
Next, examine the NetworkPolicy YAML samples located in the ~/netpol folder.
Failure to comply may result in a reduced score.
Do not delete or modify the provided samples. Only apply one of them.
Finally, apply the NetworkPolicy that enables communication between the frontend and backend Deployments, without being overly permissive.

Answer:

Explanation:
Task Summary
* Connect to host cka000056
* Review existing frontend and backend Deployments
* Choose one correct NetworkPolicy from the ~/netpol directory
* The policy must:
* Allow traffic only from the frontend Deployment to the backend Deployment
* Avoid being overly permissive
* Apply the correct NetworkPolicy without modifying any sample files
Step-by-Step Instructions
Step 1: SSH into the correct node
ssh cka000056
Step 2: Inspect the frontend Deployment
Check the labels used in the frontend Deployment:
kubectl get deployment -n frontend -o yaml
Look under metadata.labels or spec.template.metadata.labels. Note the app or similar label (e.g., app:
frontend).
Step 3: Inspect the backend Deployment
kubectl get deployment -n backend -o yaml
Again, find the labels assigned to the pods (e.g., app: backend).
Step 4: List and review the provided NetworkPolicies
List the available files:
ls ~/netpol
Check the contents of each policy file:
cat ~/netpol/<file-name>.yaml
Look for a policy that:
* Has kind: NetworkPolicy
* Applies to the backend namespace
* Uses a podSelector that matches the backend pods
* Includes an ingress.from rule that references the frontend namespace using a namespaceSelector (and optionally a podSelector)
* Does not allow traffic from all namespaces or all pods
Here's what to look for in a good match:
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: allow-frontend-to-backend
namespace: backend
spec:
podSelector:
matchLabels:
app: backend
ingress:
- from:
- namespaceSelector:
matchLabels:
name: frontend
Even better if the policy includes:
- namespaceSelector:
matchLabels:
name: frontend
podSelector:
matchLabels:
app: frontend
This limits access to pods in the frontend namespace with a specific label.
Step 5: Apply the correct NetworkPolicy
Once you've identified the best match, apply it:
kubectl apply -f ~/netpol/<chosen-file>.yaml
Apply only one file. Do not alter or delete any existing sample.
ssh cka000056
kubectl get deployment -n frontend -o yaml
kubectl get deployment -n backend -o yaml
ls ~/netpol
cat ~/netpol/*.yaml # Review carefully
kubectl apply -f ~/netpol/<chosen-file>.yaml
Command Summary
ssh cka000056
kubectl get deployment -n frontend -o yaml
kubectl get deployment -n backend -o yaml
ls ~/netpol
cat ~/netpol/*.yaml # Review carefully
kubectl apply -f ~/netpol/<chosen-file>.yaml

NEW QUESTION # 71
You are running a stateful application using a StatefulSet. How do you ensure that the application data is preserved during a rolling update?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Use Persistent Volumes:
- Use Persistent Volumes (PVs) and Persistent Volume Claims (PVCs) to provide persistent storage for the stateful application data.
- Ensure that the PVCs are mounted to the pods in the StatefulSet.

2. Configure Rolling Updates: - Configure the StatefulSet's updateStrategy' to use a rolling update strategy. - Ensure that the 'updateStrategy.type' is set to 'RollingUpdate'. 3. Validate Data Preservation: - Perform a rolling update by updating the StatefulSet. - Validate that the application data is preserved during the update process. - Check the logs and application state to confirm that the data is intact.

NEW QUESTION # 72
Create a Pod with three busy box containers with commands "ls; sleep 3600;", "echo Hello World; sleep 3600;" and "echo this is the third container; sleep 3600" respectively and check the status

A. // first create single container pod with dry run flag
kubectl run busybox --image=busybox --restart=Always --dry-run
-o yaml -- bin/sh -c "sleep 3600; ls" > multi-container.yaml
// edit the pod to following yaml and create it
apiVersion: v1
kind: Pod
metadata:
labels:
run: busybox
name: busybox
spec:
containers:
- args:
- bin/sh
- -c
- ls; sleep 3600
- echo Hello world; sleep 3600
image: busybox
name: busybox-container-2
- args:
- bin/sh
- -c
- echo this is third container; sleep 3600
image: busybox
name: busybox-container-3
restartPolicy: Always
// Verify
Kubectl get pods
B. // first create single container pod with dry run flag
kubectl run busybox --image=busybox --restart=Always --dry-run
-o yaml -- bin/sh -c "sleep 3600; ls" > multi-container.yaml
// edit the pod to following yaml and create it
apiVersion: v1
kind: Pod
metadata:
labels:
run: busybox
name: busybox
spec:
containers:
- args:
- bin/sh
- -c
- ls; sleep 3600
image: busybox
name: busybox-container-1
- args:
- bin/sh
- -c
- echo Hello world; sleep 3600
image: busybox
name: busybox-container-2
- args:
- bin/sh
- -c
- echo this is third container; sleep 3600
image: busybox
name: busybox-container-3
restartPolicy: Always
// Verify
Kubectl get pods

Answer: B

NEW QUESTION # 73
......

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Free PDF Quiz Linux Foundation - CKA - Test Certified Kubernetes Administrator (CKA) Program Exam Simulator Online

Valid Test CKA Simulator Online for Passing CKA Exam Preparation

Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q68-Q73):

Efficient Test CKA Simulator Online | Easy To Study and Pass Exam at first attempt & Professional CKA: Certified Kubernetes Administrator (CKA) Program Exam

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