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Linux Foundation CKA (Certified Kubernetes Administrator) Program Certification Exam is a highly recognized certification exam for professionals seeking to demonstrate their expertise in managing and deploying Kubernetes clusters. Kubernetes is an open-source platform for automating deployment, scaling, and management of containerized applications. As Kubernetes becomes increasingly popular, the demand for certified Kubernetes administrators continues to grow. The CKA Certification is designed to validate the skills and knowledge required to manage Kubernetes clusters effectively.

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q30-Q35):

NEW QUESTION # 30
Change the label for one of the pod to env=uat and list all the pods to verify

Answer:

Explanation:
kubectl label pod/nginx-dev3 env=uat --overwrite kubectl get pods --show-labels


NEW QUESTION # 31
You have a Deployment named 'my-app' with 5 replicas running an application container. You need to implement a rolling update strategy that allows for a maximum of 2 pods to be unavailable at any given time during the update process. Additionally, you want to ensure that the update process is triggered automatically whenever a new image is pushed to the Docker Hub repository 'my.org/my-app:latest'.

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 5.
- Define 'maxUnavailable: 2' 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.
- Add a 'spec.template.spec.imagePullPolicy: Always' to ensure that the new image is pulled even if it exists in the pod's local cache.

2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f my-app.yamP 3. Verify the Deployment: - Check the status of the deployment using 'kubectl get deployments my-app' to confirm the rollout and updated replica count. 4. Trigger the Automatic Update: - Push a new image to the 'my.org/my-app:latest' Docker Hub repository. 5. Monitor the Deployment: - Use 'kubectl get pods -l app=my-app' to monitor the pod updates during the rolling update process. You will observe that up to 2 pods are terminated at a time, while new pods with the updated image are created. 6. Check for Successful Update: - Once the deployment is complete, use 'kubectl describe deployment my-app' to see that the 'updatedReplicas' field matches the 'replicas' field, indicating a successful update.


NEW QUESTION # 32
You must connect to the correct host.
Failure to do so may result in a zero score.
[candidate@base] $ ssh Cka000051
Context
You manage a WordPress application. Some Pods are not starting because resource requests are too high.
Your task Is to prepare a Linux system for Kubernetes . Docker is already installed, but you need to configure it for kubeadm .
Task
Complete these tasks to prepare the system for Kubernetes :
Set up cri-dockerd :
. Install the Debian package
~/cri-dockerd_0.3.9.3-0.ubuntu-jammy_am
d64.deb
Debian packages are installed using
dpkg .
. Enable and start the cri-docker service
Configure these system parameters:
. Set net.bridge.bridge-nf-call-iptables to 1

Answer:

Explanation:
Task Summary
You are given a host to prepare for Kubernetes:
* Use dpkg to install cri-dockerd
* Enable and start the cri-docker service
* Set net.bridge.bridge-nf-call-iptables to 1 via sysctl
Step-by-Step Instructions
1## SSH into the correct node
bash
CopyEdit
ssh cka000051
## Required - failure to connect to the correct host = zero score.
2## Install cri-dockerd
You are told the .deb file is already located at:
bash
CopyEdit
~/cri-dockerd_0.3.9.3-0.ubuntu-jammy_amd64.deb
Install it with dpkg:
bash
CopyEdit
sudo dpkg -i ~/cri-dockerd_0.3.9.3-0.ubuntu-jammy_amd64.deb
# If any dependencies are missing (e.g., golang or containerd), you might need:
bash
CopyEdit
sudo apt-get install -f -y
But usually, the exam system provides a pre-validated .deb environment.
3## Enable and start cri-docker service
Start and enable both services:
bash
CopyEdit
sudo systemctl enable cri-docker.service
sudo systemctl enable --now cri-docker.socket
sudo systemctl start cri-docker.service
Check status (optional but smart):
bash
CopyEdit
sudo systemctl status cri-docker.service
You should see it active (running).
4## Configure the sysctl parameter
Set net.bridge.bridge-nf-call-iptables=1 immediately and persistently.
Step A: Apply immediately:
sudo sysctl net.bridge.bridge-nf-call-iptables=1
Step B: Persist it in /etc/sysctl.d:
Create or modify a file:
echo "net.bridge.bridge-nf-call-iptables = 1" | sudo tee /etc/sysctl.d/k8s.conf Reload sysctl:
sudo sysctl --system
Verify:
sysctl net.bridge.bridge-nf-call-iptables
Should return:
net.bridge.bridge-nf-call-iptables = 1
# Now the system is ready for kubeadm with Docker (via cri-dockerd)!
ssh cka000051
sudo dpkg -i ~/cri-dockerd_0.3.9.3-0.ubuntu-jammy_amd64.deb
sudo systemctl enable cri-docker.service
sudo systemctl enable --now cri-docker.socket
sudo systemctl start cri-docker.service
sudo sysctl net.bridge.bridge-nf-call-iptables=1
echo "net.bridge.bridge-nf-call-iptables = 1" | sudo tee /etc/sysctl.d/k8s.conf sudo sysctl --system


NEW QUESTION # 33
A Kubernetes worker node, named .Investigate why this is the case,
andperform any appropriate steps tobring the node to a state,ensuring that any changes are madepermanent.
You cansshto the failednode using:
[student@node-1] $ | sshWk8s-node-0
You can assume elevatedprivileges on the node with thefollowing command:
[student@w8ks-node-0] $ |sudo -i

Answer:

Explanation:
See the solution below.
Explanation
solution



NEW QUESTION # 34
You have a Kubernetes cluster with a 'default' namespace. You want to prevent any users from creating pods in this namespace.
Create a ClusterRole and ClusterRoleBinding to achieve this restriction.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
Step 1: Create a ClusterRole to deny pod creation in the 'default' namespace.

Step 2: Create a ClusterRoleBinding to apply the ClusterRole to all users.

We create a ClusterRole that specifically targets the 'default' namespace and denies 'create' permissions for pods. This ClusterRole uses 'resourceNames' and 'namespaceSelector& to precisely target the 'default' namespace. We create a ClusterRoleBinding that applies the ClusterRole to all users in the cluster. Applying the configurations: Use 'kubectl apply -f [filename].yaml' to apply the ClusterRole and ClusterRoleBinding YAML files. This will prevent anyone from creating pods in the 'default' namespace. This configuration is a powerful way to implement security policies and prevent unintended resource creation in sensitive namespaces. ,


NEW QUESTION # 35
......

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