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Linux-Foundation CKA Exam Questions

Linux-Foundation CKA Exam Questions Answers

Certified Kubernetes Administrator (CKA) Program

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Linux-Foundation CKA Practice Test Questions ( Updated) – Real Exam Questions & Dumps PDF

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Linux-Foundation CKA Sample Questions – Free Practice Test & Real Exam Prep

Question #1

You must connect to the correct host.Failure to do so may result in a zero score.[candidate@base] $ ssh Cka000037ContextA legacy app needs to be integrated into the Kubernetes built-in logging architecture (i.e.kubectl logs). Adding a streaming co-located container is a good and common way toaccomplish this requirement.Question No : 60 SIMULATIONLinux Foundation CKA : Practice TestTaskUpdate the existing Deployment synergy-leverager, adding a co-located container namedsidecar using the busybox:stable image to the existing Pod . The new co-located containerhas to run the following command:/bin/sh -c "tail -n+1 -f /var/log/synergy-leverager.log"Use a Volume mounted at /var/log to make the log file synergy-leverager.log available tothe colocated container .Do not modify the specification of the existing container other than adding the requiredvolume mount .Failure to do so may result in a reduced score. 

Answer: See the solution below.
Explanation:

Task Summary
SSH into the correct node: cka000037
Modify existing deployment synergy-leverager
Add a sidecar container:
/bin/sh -c "tail -n+1 -f /var/log/synergy-leverager.log"
Use a shared volume mounted at /var/log
Don't touch existing container config except adding volume mount
Step-by-Step Solution
1 SSH into the correct node
ssh cka000037
 Skipping this will result in a zero score.
2 Edit the deployment
Linux Foundation CKA : Practice Test

kubectl edit deployment synergy-leverager
This opens the deployment YAML in your default editor (vi or similar).
3 Modify the spec as follows
 Inside the spec.template.spec, do these 3 things:
 A. Define a shared volume
Add under volumes: (at the same level as containers):
volumes:
- name: log-volume
emptyDir: {}
 B. Add volume mount to the existing container
Locate the existing container under containers: and add this:
volumeMounts:
- name: log-volume
mountPath: /var/log
 Do not change any other configuration for this container.
 C. Add the sidecar container
Still inside containers:, add the new container definition after the first one:
- name: sidecar
image: busybox:stable
command:
- /bin/sh
- -c
- "tail -n+1 -f /var/log/synergy-leverager.log"
volumeMounts:
- name: log-volume
mountPath: /var/log
spec:
containers:
- name: main-container
image: your-existing-image
volumeMounts:
- name: log-volume
mountPath: /var/log
- name: sidecar
image: busybox:stable
command:
- /bin/sh
- -c
- "tail -n+1 -f /var/log/synergy-leverager.log"
volumeMounts:

Linux Foundation CKA : Practice Test
- name: log-volume
mountPath: /var/log
volumes:
- name: log-volume
emptyDir: {}
Save and exit
If using vi or vim, type:
bash
CopyEdit
wq
5 Verify
Check the updated pods:
kubectl get pods -l app=synergy-leverager
Pick a pod name and describe it:
kubectl describe pod <pod-name>
Confirm:
2 containers running (main-container + sidecar)
Volume mounted at /var/log
ssh cka000037
kubectl edit deployment synergy-leverager
# Modify as explained above
kubectl get pods -l app=synergy-leverager
kubectl describe pod <pod-name> 
Question #2

Create a nginx pod with label env=test in engineering namespace 

Answer: See the solution below.
Explanation:

Question No : 56 SIMULATION
Question No : 57 SIMULATION
Question No : 58 SIMULATION
Linux Foundation CKA : Practice Test

kubectl run nginx --image=nginx --restart=Never --labels=env=test --
namespace=engineering --dry-run -o yaml > nginx-pod.yaml
kubectl run nginx --image=nginx --restart=Never --labels=env=test --
namespace=engineering --dry-run -o yaml | kubectl create -n engineering -f –
YAML File:
apiVersion: v1
kind: Pod
metadata:
name: nginx
namespace: engineering
labels:
env: test
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
restartPolicy: Never
kubectl create -f nginx-pod.yaml  
Question #3

List all the pods sorted by name

Answer: See the solution below.
Explanation:

kubect1 get pods --sort-by=.metadata.name 
Question #4

List pod logs named “frontend” and search for the pattern “started” and write it to a file“/opt/error-logs” 

Answer: See the solution below.
Explanation:

Kubectl logs frontend | grep -i “started” > /opt/error-logs
Question #5

Check the Image version of nginx-dev pod using jsonpath 

Answer: See the solution below.
Explanation:

kubect1 get po nginx-dev -o
jsonpath='{.spec.containers[].image}{"\n"}
Question #6

Create a pod that echo “hello world” and then exists. Have the pod deleted automaticallywhen it’s completed

Answer: See the solution below.
Explanation:

kubectl run busybox --image=busybox -it --rm --restart=Never --
/bin/sh -c 'echo hello world'
kubectl get po # You shouldn't see pod with the name "busybox" 
Question #7

You must connect to the correct host.Failure to do so may result in a zero score.[candidate@base] $ ssh Cka000047TaskA MariaDB Deployment in the mariadb namespace has been deleted by mistake. Your taskis to restore the Deployment ensuring data persistence. Follow these steps:Create a PersistentVolumeClaim (PVC ) named mariadb in the mariadb namespace withthefollowing specifications:Access mode ReadWriteOnceStorage 250MiYou must use the existing retained PersistentVolume (PV ).Failure to do so will result in a reduced score.There is only one existing PersistentVolume .Edit the MariaDB Deployment file located at ~/mariadb-deployment.yaml to use PVC youcreated in the previous step.Apply the updated Deployment file to the cluster.Ensure the MariaDB Deployment is running and stable.

Answer: See the solution below.
Explanation:

Task Overview
You're restoring a MariaDB deployment in the mariadb namespace with persistent data.
 Tasks:
SSH into cka000047
Create a PVC named mariadb:
Edit ~/mariadb-deployment.yaml to use the PVC
Apply the deployment
Verify MariaDB is running and stable
Step-by-Step Solution
Linux Foundation CKA : Practice Test

1 SSH into the correct host
ssh cka000047
 Required — skipping = zero score
2 Inspect the existing PersistentVolume
kubectl get pv
 Identify the only existing PV, e.g.:
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM
STORAGECLASS
mariadb-pv 250Mi RWO Retain Available <none> manual
Ensure the status is Available, and it is not already bound to a claim.
3 Create the PVC to bind the retained PV
Create a file mariadb-pvc.yaml:
cat <<EOF > mariadb-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mariadb
namespace: mariadb
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 250Mi
volumeName: mariadb-pv # Match the PV name exactly
EOF
Apply the PVC:
kubectl apply -f mariadb-pvc.yaml
 This binds the PVC to the retained PV.
4 Edit the MariaDB Deployment YAML
Open the file:
nano ~/mariadb-deployment.yaml
Look under the spec.template.spec.containers.volumeMounts and
spec.template.spec.volumes sections and update them like so:
Add this under the container:
yaml
CopyEdit
volumeMounts:
- name: mariadb-storage
mountPath: /var/lib/mysql
And under the pod spec:
Linux Foundation CKA : Practice Test
volumes:

- name: mariadb-storage
persistentVolumeClaim:
claimName: mariadb
 These lines mount the PVC at the MariaDB data directory.
5 Apply the updated Deployment
kubectl apply -f ~/mariadb-deployment.yaml
6 Verify the Deployment is running and stable
kubectl get pods -n mariadb
kubectl describe pod -n mariadb <mariadb-pod-name>
 Ensure the pod is in Running state and volume is mounted.
 Final Command Summary
ssh cka000047
kubectl get pv # Find the retained PV
# Create PVC
cat <<EOF > mariadb-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mariadb
namespace: mariadb
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 250Mi
volumeName: mariadb-pv
EOF
kubectl apply -f mariadb-pvc.yaml
# Edit Deployment
nano ~/mariadb-deployment.yaml
# Add volumeMount and volume to use the PVC as described
kubectl apply -f ~/mariadb-deployment.yaml
Linux Foundation CKA : Practice Test

kubectl get pods -n mariadb 
Question #8

Create a namespace called 'development' and a pod with image nginx called nginx on thisnamespace.

Answer: See the solution below.
Explanation:

kubectl create namespace development
kubectl run nginx --image=nginx --restart=Never -n development
Question #9

Get list of all pods in all namespaces and write it to file “/opt/pods-list.yaml”

Answer: See the solution below.
Explanation:

kubectl get po –all-namespaces > /opt/pods-list.yaml 
Question #10

List “nginx-dev” and “nginx-prod” pod and delete those pods 

Answer: See the solution below.
Explanation:

kubect1 get pods -o wide
kubectl delete po “nginx-dev”
kubectl delete po “nginx-prod” 
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