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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q32-Q37):
NEW QUESTION # 32
You have a Deployment running an application that requires a specific network policy. How can you define a network policy that allows only traffic from Pods belonging to the same namespace as the application and denies all other traffic?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Network Policy Definition:

2. Explanation: - 'apiVersion: networking.k8s.io/v1 ' : Specifies the API version for NetworkPolicy resources. - 'kind: NetworkPolicy': Specifies that this is a NetworkPolicy resource. - 'metadata.name: allow-same-namespace': Sets the name of the NetworkPolicy. - 'metadata.namespace: Specifies the namespace where the NetworkPolicy is applied. Replace " with the actual namespace where your deployment is running. - 'spec.podSelector: {F: This empty podSelector means the NetworkPolicy applies to all Pods in the namespace. - 'spec.ingress': This section defines the rules for incoming traffic. - 'spec.ingress.from.podSelector: {F: This allows traffic from any Pods within the same namespace. 3. How it works: - This NetworkPolicy allows incoming traffic only from Pods within the same namespace where the Deployment is running. It explicitly denies all other traffic, effectively isolating the application to communication only within its namespace. 4. Implementation: - Apply the YAML using 'kubectl apply -f allow-same-namespace.yaml' 5. Verification: After applying the NetworkPolicy, test the communication between Pods within the same namespace and Pods in other namespaces. You should observe that the NetworkPolicy successfully enforces the defined restrictions.



NEW QUESTION # 33

Task
Create a new Ingress resource as follows:
. Name: echo
. Namespace : sound-repeater
. Exposing Service echoserver-service on
[example.org]
using Service port 8080
The availability of Service
echoserver-service can be checked
i
using the following command, which should return 200 :
[candidate@#$%&cka000024] $ curl -o /de v/null -s -w "%{http_code}\n"
[example.org]

Answer:

Explanation:
Task Summary
Create an Ingress named echo in the sound-repeater namespace that:
* Routes requests to /echo on host example.org
* Forwards traffic to service echoserver-service
* Uses service port 8080
* Verification should return HTTP 200 using curl
# Step-by-Step Answer
1## SSH into the correct node
As shown in the image:
bash
CopyEdit
ssh cka000024
## Skipping this will result in a ZERO score!
2## Verify the namespace and service
Ensure the sound-repeater namespace and echoserver-service exist:
kubectl get svc -n sound-repeater
Look for:
echoserver-service ClusterIP ... 8080/TCP
3## Create the Ingress manifest
Create a YAML file: echo-ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: echo
namespace: sound-repeater
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$1
spec:
rules:
- host: example.org
http:
paths:
- path: /echo
pathType: Prefix
backend:
service:
name: echoserver-service
port:
number: 8080
4## Apply the Ingress resource
kubectl apply -f echo-ingress.yaml
5## Test with curl as instructed
Use the exact verification command:
curl -o /dev/null -s -w "%{http_code}\n"
[example.org]
# You should see:
200
# Final Answer Summary
ssh cka000024
kubectl get svc -n sound-repeater
# Create the Ingress YAML
cat <<EOF > echo-ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: echo
namespace: sound-repeater
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$1
spec:
rules:
- host: example.org
http:
paths:
- path: /echo
pathType: Prefix
backend:
service:
name: echoserver-service
port:
number: 8080
EOF
kubectl apply -f echo-ingress.yaml
curl -o /dev/null -s -w "%{http_code}\n"
[example.org]



NEW QUESTION # 34
List all the events sorted by timestamp and put them into file.log and verify

A. kubectl get events --sort-by=.metadata.creationTimestamp
// putting them into file.log
kubectl get events --sort-by=.metadata.creationTimestamp >
test-file.log
cat test-file.log
B. kubectl get events --sort-by=.metadata.creationTimestamp
// putting them into file.log
kubectl get events --sort-by=.metadata.creationTimestamp >
cat test-file.log
C. kubectl get events --sort-by=.metadata.creationTimestamp
kubectl get events --sort-by=.metadata.creationTimestamp >
test-file.log
cat test-file.log
Answer: A



NEW QUESTION # 35
A Service named my-service' is exposed on port 80 of your Kubernetes cluster. You need to access the service from a specific node in the cluster using its internal IP address. How can you find the internal IP address of the node running a pod associated with 'my-service'?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify the Pod:
- Use 'kubectl get pods -l service=my-service' to list the pods associated with the 'my-service' service. Note the name of the pod.
2. Get the Pod's Node:
- Use 'kubectl describe pod (where is the name of the pod from step 1) to get the details of the pod.
- Look for the 'Node' field, which indicates the node where the pod is running.
3. Get the Node's Internal IP:
- Use 'kubectl get nodes (where is the name of the node from step 2) to get the node details.
- Look for the 'InternallP' field to find the internal IP address of the node.
4. Access the Service:
- Now you can access the 'my-service' service from the identified node using its internal IP address and the service's port (80):
- '[]; (replace with the internal IP obtained in step 3).
5. Important Note: Internal IP addresses are only accessible within the Kubernetes cluster. If you need to access the service from outside the cluster, you'll need to use a public IP or expose the service through a LoadBalancer or Ingress.



NEW QUESTION # 36
You are running a MySQL database on a Kubernetes cluster. You want to ensure that your database data is persistent even if a pod is deleted or restarted. You need to create a PersistentVolumeClaim (PVC) to request a specific storage class with a 1 OGB capacity, access mode of 'ReadWriteOnce', and storage class of 'fast-storage'. Explain the configuration and how to create the PVC and then use the PVC to create a StatefulSet for your MySQL deployment.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a PersistentVolumeClaim:
- Create a YAML file named 'mysql-pvc.yaml' with the following content:

- Apply the YAML file using 'kubectl apply -f mysql-pvc.yamP. 2. Create a StatefulSet for MySQL Deployment: - Create a YAML file named 'mysql-statefulset.yaml' with the following content:

- Apply the YAML file using 'kubectl apply -f mysql-statefulset.yaml'. 3. Verify Deployment: - Check the status of the StatefulSet using 'kubectl get statefulsets mysql'. - Ensure that the pod is running and the PVC is mounted correctly. You can use 'kubectl describe pod mysql-0' to see the details of the pod and the mounted PVC.



NEW QUESTION # 37
......

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