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The CKAD exam is a hands-on, performance-based test that measures a candidate's ability to perform real-world tasks with Kubernetes. CKAD exam consists of a set of practical challenges that require the candidate to use their knowledge of Kubernetes to complete a series of tasks. CKAD Exam is conducted online and can be taken from anywhere in the world. Candidates are provided with a set of tools and resources to complete the exam, including a terminal and a set of Kubernetes objects.
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Linux Foundation Certified Kubernetes Application Developer (CKAD) Exam is a certification program designed to test the skills and knowledge of developers who are interested in working with Kubernetes. Kubernetes is an open-source container orchestration system that is used to automate the deployment, scaling, and management of containerized applications. The CKAD Exam is designed to test a developer's ability to design, build, configure, and expose Kubernetes applications.
NEW QUESTION # 224
Refer to Exhibit.
Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Task
You have rolled out a new pod to your infrastructure and now you need to allow it to communicate with the web and storage pods but nothing else. Given the running pod kdsn00201 -newpod edit it to use a network policy that will allow it to send and receive traffic only to and from the web and storage pods.
Answer:
Explanation:
To allow a pod to send and receive traffic only to and from specific pods, you can use network policies in Kubernetes.
First, you will need to create a network policy that defines the allowed traffic. You can create a network policy yaml file with the following rules:
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: newpod-network-policy
namespace: default
spec:
podSelector:
matchLabels:
app: kdsn00201-newpod
ingress:
- from:
- podSelector:
matchLabels:
app: web
- podSelector:
matchLabels:
app: storage
This policy will only allow incoming traffic to the pod with the label app=kdsn00201-newpod from pods with the label app=web or app=storage. If you have different labels on your web and storage pods please update the matchLabels accordingly.
Once you have created the network policy, you can apply it to the cluster by running the following command:
kubectl apply -f <network-policy-file>.yaml
This will apply the network policy to the cluster, and the newpod will only be able to send and receive traffic to and from the web and storage pods.
Please note that, NetworkPolicy resource is not available by default, you need to enable the NetworkPolicy feature on your Kubernetes cluster. This feature is enabled by default on some clusters and must be explicitly enabled on others. You can check if NetworkPolicy is available by running the command kubectl api-versions | grep networking Also, you need to ensure that the pods that you want to allow traffic to and from are running on the same namespace.
NEW QUESTION # 225 
Task:
Update the Deployment app-1 in the frontend namespace to use the existing ServiceAccount app.
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 226 
Context
As a Kubernetes application developer you will often find yourself needing to update a running application.
Task
Please complete the following:
* Update the app deployment in the kdpd00202 namespace with a maxSurge of 5% and a maxUnavailable of 2%
* Perform a rolling update of the web1 deployment, changing the Ifccncf/ngmx image version to 1.13
* Roll back the app deployment to the previous version
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 227
You are running a critical application in your Kubernetes cluster, and it requires access to sensitive information stored in a secret To ensure the application only accesses the specific data it needs and avoids potential misuse, you need to configure ServiceAccounts With proper permissions to access the secret. Describe the steps involved in creating a ServiceAccount with the least privilege principle to access the secret Additionally, mention the YAML configuration required for the ServiceAccount and Role.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Secret:
- Create a secret to store your sensitive data using 'kubectl create secret generic my-secret -from
- This command creates a secret named 'my-secret' with two key-value pairs: 'username' and 'password'
- Replace the values with your actual sensitive data.
2. Create a ServiceAccount
- Create a ServiceAccount using 'kubectl create serviceaccount my-service-account
- This command creates a ServiceAccount named 'my-service-account'
3. Create a Role:
- Create a Role to define the permissions for the ServiceAccount. This role will grant access to the secret.
- Create a Role named 'my-role' using the following YAML:
- Save this configuration in a file named 'my-role.yamr and apply it to your cluster using 'kubectl apply -f my-role-yamp - Replace 'default' With the namespace where your secret is created. 4. Bind the Role to the ServiceAccount: - Bind the created Role to the ServiceAccount using 'kubectl create rolebinding my-role-binding -role-my-role account'. - This command creates a RoleBinding named 'my-role-binding' which binds the 'my-role' to the 'my-service-account' in the 'default' namespace. - Replace 'default' With the namespace where your secret is created. 5. Verify Permissions: - You can verify the ServiceAccount's access to the secret using 'kubectl auth can-i get secrets -as-my-service-account --namespace=default' - This command should return 'yes' if the ServiceAccount has the necessary permissions. 6. Use the ServiceAccount in your Pod: - Use the ServiceAccount within your Pod's specification to grant the application access to the secret. - Add a 'serviceAccountNames field Within your Pod specification pointing to tne created ServiceAccount.
Now your application running in the Pod will have access to the secret 'my-secret using the environment variables defined in the 'envFror-n' section. The ServiceAccount 'my-service-account is configured with the least privilege principle, ensuring that it can only access the necessary data. ,
NEW QUESTION # 228
You have a Deployment running a web application built With a Node.js container. The application currently uses an older version of the Node.js runtime, and you need to upgrade to a newer versiom Describe the steps involved in modifying the container image to include the new Node.js runtime without rebuilding the entire application.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Dockerfile:
- Create a new 'Dockerfile' With the following content
- Replace With the name of the existing Docker image used by your Deployment. - This Dockefflle uses a multi-stage build approach. It starts with a new Node.js base image and copies the application code from the existing image. This allows you to update the runtime without rebuilding the entire application. 2. Build the New Image: - Build tne image using the Dockerflle: docker build -t updated-image:latest 3. Update the Deployment - Modify your Deployment YAML file to use the newly built image:
4. Apply the Changes: - Apply the updated Deployment using 'kubectl apply -f deployment.yamr. This will trigger a rolling update to the pods using the new image. 5. Verify the Update: - Check the logs of the pods using 'kubectl logs -f ' . You should see the application running with the updated Node.js version. 6. Test the Application: - Access your application and ensure it functions correctly with the new Node.js runtime.
NEW QUESTION # 229
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