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Linux Foundation Certified CKA  Dumps Questions Valid CKA Materials

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QUESTION 21
Create an nginx pod and list the pod with different levels of verbosity

See the solution below.
Explanation
// create a pod
kubectl run nginx –image=nginx –restart=Never –port=80
// List the pod with different verbosity
kubectl get po nginx –v=7
kubectl get po nginx –v=8
kubectl get po nginx –v=9

QUESTION 22
Perform the following tasks:
* Add an init container tohungry-bear(which has beendefined in spec file
/opt/KUCC00108/pod-spec-KUCC00108.yaml)
* The init container should createan empty file named/workdir/calm.txt
* If/workdir/calm.txtis notdetected, the pod should exit
* Once the spec file has beenupdatedwith the init containerdefinition, the pod should becreated

See the solution below.
Explanation
solution

QUESTION 23
Create a pod that having 3 containers in it? (Multi-Container)

 image=nginx, image=redis, image=consul
Name nginx container as “nginx-container”
Name redis container as “redis-container”
Name consul container as “consul-container”
Create a pod manifest file for a container and append container
section for rest of the images
kubectl run multi-container –generator=run-pod/v1 –image=nginx —
dry-run -o yaml > multi-container.yaml
# then
vim multi-container.yaml
apiVersion: v1
kind: Pod
metadata:
labels:
run: multi-container
name: multi-container
spec:
containers:
– image: nginx
name: nginx-container
– image: redis
name: redis-container
– image: consul
name: consul-container
restartPolicy: Always

 image=nginx, image=redis, image=consul
Name nginx container as “nginx-container”
Name redis container as “redis-container”
Name consul container as “consul-container”
Create a pod manifest file for a container and append container
section for rest of the images
kubectl run multi-container –generator=run-pod/v1 –image=nginx —
dry-run -o yaml > multi-container.yaml
# then
vim multi-container.yaml
labels:
run: multi-container
name: multi-container
spec:
containers:
– image: nginx
name: nginx-container
– image: redis
name: consul-container
restartPolicy: Always

QUESTION 24
List all service account and create a service account called “admin”

 kubectl get sa
kubectl get sa –all-namespaces
kubectl create sa admin
//Verify
kubectl get sa admin -o yaml

 kubectl get sa
kubectl get sa –all-namespaces
//Verify
kubectl get sa admin -o yaml

QUESTION 25
You have a deployment that uses a PersistentVolumeClaim for its storage. The deployment is scaled to 5 replicas. You notice that each pod is using the same volume, leading to data corruption. Explain why this is happening and how you can fix the problem.

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
This problem arises because the access mode of the PersistentVolumeClaim is set to ‘ReadWriteMany’, and the PVC is shared between all pods. When multiple pods access the same data simultaneously, data corruption can occur due to inconsistent updates. To fix the issue, you need to change the PVC access mode to ‘ReadWriteOnce’ and create individual PVCs for each pod. Here’s how:
1. Update the PVC Access Mode:
– Modify the access mode in the PersistentVolumeClaim YAML file to ‘ReadWriteOnce’.

2. Update the Deployment to use Multiple PVCs: – Update the Deployment YAML to use a unique PVC for each pod by specifying the ‘persistentVolumeClaim’ field in the ‘spec.template.spec.containers.volumeMounts’ section.

3. Apply the Changes: – Apply the updated PVC and Deployment YAML files using ‘kubectl apply -f my-pvc.yaml’ and “kubectl apply -f my-deployment.yaml’ , respectively. – By setting the PVC access mode to ‘ReadWriteOnce’, each pod can access the volume exclusively. – The updated Deployment definition ensures that each pod has a unique PersistentVolumeClaim. The ‘claimName’ field in the volumes’ section uses the ‘pod.metadata.name’ to create a unique name for each PVC. This ensures that each pod has its own dedicated storage, preventing data corruption and ensuring data consistency.]

QUESTION 26
Create a pod as follows:
* Name:non-persistent-redis
* container Image:redis
* Volume with name:cache-control
* Mount path:/data/redis
The pod should launch in thestagingnamespace and the volumemust notbe persistent.

See the solution below.
Explanation
solution

QUESTION 27
You are setting up RBAC for a Kubernetes cluster with three namespaces: “development”, “staging”, and “production”. You need to create a role binding that allows developers in the “development” namespace to create deployments, pods, and services, but only within their own namespace.

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 Create a Role for Developers:

2. Create a Role Binding for Developers:

3. Replace ‘developer-user’ with the actual username of a developer. 4. Repeat steps 1-3 for other namespaces (“staging” and “production”) with appropriate resource permissions and user names. 5. Verify the RBAC configuration: – Check that the roles and rolebindings are created successfully using ‘kubectl get roles’ and ‘kubectl get rolebindings’. – Test the permissions by creating a pod, deployment, or service as a developer user in their respective namespaces. 6. If you encounter issues, review the configuration carefully, making sure the namespaces, roles, role bindings, and user names are correct.

QUESTION 28
Your organization uses a private DNS server for internal services and requires all Kubernetes pods to resolve names against this DNS server. You need to configure CoreDNS to forward all DNS requests to this private server.

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Configure CoreDNS with Forwarding:
– In the CoreDNS ConfigMap, configure the ‘forward’ plugin to forward all DNS requests to your private DNS server.

2. Test DNS Resolution: – Use the ‘nslookup’ command from a pod in your cluster to test DNS resolution for internal services. – The requests should be forwarded to the private DNS server, and the corresponding records should be returned.

QUESTION 29
Create a deployment as follows:
* Name: nginx-random
* Exposed via a service nginx-random
* Ensure that the service & pod are accessible via their respective DNS records
* The container(s) within any pod(s) running as a part of this deployment should use the nginx Image Next, use the utility nslookup to look up the DNS records of the service & pod and write the output to
/opt/KUNW00601/service.dns and /opt/KUNW00601/pod.dns respectively.

See the solution below.
Explanation
Solution:

QUESTION 30
Create a Job with an image node which prints node version and
verifies there is a pod created for this job

 kubectl create job nodeversion –image=node — node -v
kubectl get job -w
kubectl get pod
YAML File:
apiVersion: batch/v1
kind: Job
metadata:
labels:
job-name: nodeversion
name: nodeversion
spec:
completions: 1
parallelism: 1
selector:
matchLabels:
job-name: nodeversion
template:
metadata:
labels:
job-name: nodeversion
spec:
containers:
– command:
– node
– -v
image: node
imagePullPolicy: Always
name: nodeversion
restartPolicy: Never

 kubectl create job nodeversion –image=node — node -v
kubectl get job -w
kubectl get pod
YAML File:
apiVersion: batch/v1
kind: Job
metadata:
labels:
job-name: nodeversion
name: nodeversion
spec:
completions: 1
parallelism: 1
labels:
job-name: nodeversion
spec:
containers:
– command:
– node
– -v
image: node
imagePullPolicy: Always
name: nodeversion
restartPolicy: Never

QUESTION 31
Get the list of pods of webapp deployment

 // Get the label of the deployment
kubectl get deploy –show-labels
kubectl get pods -l app=webapp

 // Get the label of the deployment
kubectl get deploy –show-labels
// Get the pods with that label
kubectl get pods -l app=webapp

QUESTION 32
You have a Deployment named ‘my-app’ running a web application with three replicas. The application is exposed using a ‘LoadBalancer’ service. You want to create a ‘ClusterlP’ service for internal communication within the Kubernetes cluster and route traffic from the ‘LoadBalancer’ service to the ‘ClusterlP’ service.

See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create the ClusterlP service:
– Define a ‘ClusterlP’ service that points to the my-app’ Deployment.

2. Create the LoadBalancer service: – Define a ‘LoadBalancer service that routes traffic to the my-app-internar service.

3. Apply the Service YAMLs: – Apply the YAML files for both services using ‘kubectl apply -f my-app-internal.yamP and ‘kubectl apply -f my- app-external.yamr. 4. Verify the Services: – Check the status of both services using ‘kubectl get services’. You should see the ‘my-app-internal’ service with a ‘ClusterlP’ and the my-app-external’ service with an external IP address. 5. Test the Routing: – Access the application through the external IP address of the ‘my-app-external’ service. The traffic should be routed to the ‘my-app-internal’ service and then to the my-app’ Deployment. Note: Replace with the actual namespace where your Deployment and Services are located.

QUESTION 33
From the pod label name=cpu-utilizer, find pods running high CPU workloads and write the name of the pod consuming most CPU to the file /opt/KUTR00102/KUTR00102.txt (which already exists).

solution

QUESTION 34
Ensure a single instance of pod nginx is running on each node of the Kubernetes cluster where nginx also represents the Image name which has to be used. Do not override any taints currently in place.
Use DaemonSet to complete this task and use ds-kusc00201 as DaemonSet name.

QUESTION 35
Create a pod named kucc8 with a single app container for each of the
following images running inside (there may be between 1 and 4 images specified):
nginx + redis + memcached.

 Loading …

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