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Linux Foundation CKA Exam Syllabus Topics:

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

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q53-Q58):

NEW QUESTION # 53
You have a Deployment with 5 replicas. You want to increase the number of replicas to 10, but only after ensuring that the new pods are healthy and ready to serve traffic.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML:
- Update the 'replicas' field in the Deployment YAML to 10.

2. Apply the Changes: - Apply the updated YAML file using 'kubectl apply -f my-deployment.yaml' 3. Monitor Pod Status: - Use 'kubectl get pods -l app=my-app' to monitor the status of the pods. - Ensure that the new pods are in the "Running' state and have a 'Ready' status. 4. Check Liveness and Readiness Probes: - If applicable, ensure that liveness and readiness probes are configured to check the health of the pods. - This helps in identifying and restarting unhealthy pods. 5. Verify Service Availability: - Use 'kubectl get services my-service" to check the service status. - Ensure that the service is still available and serving traffic. 6. Increase Replicas: - Once the new pods are healthy and ready, the deployment will automatically scale up to 10 replicas.

NEW QUESTION # 54
You have a Deployment running a web application with three replicas. The application is exposed using a 'NodePort' service. You need to configure the service so that it allows traffic only from specific IP addresses (e.g., 192.168.1.10, 192.168.1.20).

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a NetworkPolicy:
- Define a NetworkPolicy resource that allows traffic from the specified IP addresses to the Deployment pods.

2. Apply the NetworkPolicy: - Apply the YAML file using 'kubectl apply -f networkpolicy.yaml'. 3. Verify the NetworkPolicy: - Check the status of the NetworkPolicy using 'kubectl get networkpolicies allow-specific-ips -n 4. Test the Access: - Attempt to access the web application from the allowed IP addresses. You should be able to access it. - Try to access the application from other IP addresses. You should not be able to access it. Note: Replace " with the actual namespace where your Deployment and NetworkPolicy are located.

NEW QUESTION # 55
Create a redis pod, and have it use a non-persistent storage
(volume that lasts for the lifetime of the Pod)

A. vim redis-pod-vol.yaml
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6379
volumeMounts:
- mountPath: /data
name: redis-storage
volumes:
- name: redis-storage
emptyDir: {}
kubectl apply -f redis-pod-vol.yaml
B. vim redis-pod-vol.yaml
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6679
volumeMounts:
- mountPath: /data
name: redis-storage
volumes:
- name: redis-storage
emptyDir: {}
kubectl apply -f redis-pod-vol.yaml

Answer: A

NEW QUESTION # 56
Schedule a pod as follows:
Name: nginx-kusc00101
Image: nginx
Node selector: disk=ssd

Answer:

Explanation:
See the solution below.
Explanation
solution
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F:\Work\Data Entry Work\Data Entry\20200827\CKA\6 C.JPG

F:\Work\Data Entry Work\Data Entry\20200827\CKA\6 D.JPG

NEW QUESTION # 57
You have a Deployment named 'database-deployment' with 2 replicas of a database container. You want to implement a rolling update strategy that allows for a maximum of one pod to be unavailable at any given time. However, you also want to ensure that the database container is restarted automatically when it encounters a failure or crashes. This restart policy should be applied only to the database containers within the deployment and not affect any other containers in the same pod.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML:
- Update the 'replicas' to 2.
- Define 'maxUnavailable: 1' and 'maxSurge: 0' in the strategy.rollingUpdate' section to control the rolling update process.
- Configure a 'strategy.type' to 'RollingUpdate' to trigger a rolling update when the deployment is updated.
- Set 'spec.template.spec.containers[0].restartPolicy: Always' to ensure the database container restarts automatically when it encounters a failure.

2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f database-deployment.yaml' 3. Verify the Deployment: - Check the status of the deployment using 'kubectl get deployments database-deployment' to confirm the rollout and updated replica count. 4. Test the Restart Policy: - Trigger a failure in the 'database' container within one of the pods. This can be done by sending a SIGKILL signal to the container or by simulating a crash within the container itself. - Observe that the 'database' container will be restarted automatically while other containers in the same pod will remain unaffected. 5. Trigger the Automatic Update: - Push a new image to the 'my-database-image:latest registry. 6. Monitor the Deployment: - Use "kubectl get pods -l app=database' to monitor the pod updates during the rolling update process. 7. Check for Successful Update: - Once the deployment is complete, use 'kubectl describe deployment database-deployment' to see that the 'updatedReplicas' field matches the 'replicas' field, indicating a successful update.

NEW QUESTION # 58
......

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