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Linux Foundation CKA Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Workloads & Scheduling	15%	- Understand DaemonSets - Understand resource limits and requests - Use label selectors to schedule Pods - Understand how to run multiple schedulers and configure scheduler policies - Understand how scheduler works - Understand Static Pods - Understand Deployments and rolling update/rollback - Use ConfigMaps and Secrets to configure applications
Topic 2: Storage	10%	- Understand volume mode, access modes and reclaim policies - Understand Storage Classes and Persistent Volumes - Understand how to configure applications with persistent storage - Understand persistent volume claims primitive
Topic 3: Troubleshooting	30%	- Troubleshoot application failure - Understand how to monitor applications - Evaluate cluster and node logging - Troubleshoot cluster component failure - Troubleshoot networking - Manage container stdout & stderr logs
Topic 4: Services & Networking	20%	- Know how to use Ingress controllers and Ingress resources - Use ClusterIP, NodePort, LoadBalancer service types and endpoints - Understand connectivity between Pods - Define and enforce Network Policies - Understand and use CoreDNS - Use the Gateway API to manage Ingress traffic
Topic 5: Cluster Architecture, Installation & Configuration	25%	- Manage role based access control (RBAC) - Prepare underlying infrastructure for installing a Kubernetes cluster - Use Helm and Kustomize to install cluster components - Manage the lifecycle of Kubernetes clusters - Implement and configure a highly-available control plane - Understand CRDs, install and configure operators - Understand extension interfaces (CNI, CSI, CRI, etc.) - Create and manage Kubernetes clusters using kubeadm

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q68-Q73):

NEW QUESTION # 68
Create a pod with init container which create a file "test.txt"
in "workdir" directory. Main container should check a file
"test.txt" exists and execute sleep 9999 if the file exists.

A. // create an initial yaml file with this
kubectl run init-cont-pod --image=alpine --restart=Never --dry-run -o
yaml > init-cont-pod.yaml
// edit the yml as below and create it
vim init-cont-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: init-cont-pod
labels:
app: myapp
spec:
volumes:
- name: test-volume
emptyDir: {}
containers:
- name: main-container
image: busybox:1.28
command: ['sh', '-c', 'if [ -f /workdir/test.txt ]; then sleep
9999; fi']
volumeMounts:
- name: test-volume
mountPath: /workdir
initContainers:
- name: init-myservice
image: busybox:1.28
command: ['sh', '-c', "mkdir /workdir; echo >
/workdir/test.txt"]
volumeMounts:
- name: test-volume
mountPath: /workdir
// Create the pod
kubectl apply -f init-cont-pod.yaml
kubectl get pods
// Check Events by doing
kubectl describe po init-cont-pod
Init Containers:
init-myservice:
Container ID:
docker://ebdbf5fad1c95111d9b0e0e2e743c2e347c81b8d4eb5abcccdfe1dd74524
0d4f
Image: busybox:1.28
Image ID: dockerpullable://busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df
416dea4f41046e0f37d47
Port: <none>
Host Port: <none>
Command:
sh
-c
mkdir /workdir; echo > /workdir/test.txt
State: Terminated Reason: Completed
B. // create an initial yaml file with this
kubectl run init-cont-pod --image=alpine --restart=Never --dry-run -o
yaml > init-cont-pod.yaml
// edit the yml as below and create it
vim init-cont-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: init-cont-pod
labels:
app: myapp
spec:
volumes:
- name: test-volume
emptyDir: {}
containers:
- name: main-container
image: busybox:1.28
command: ['sh', '-c', 'if [ -f /workdir/test.txt ]; then sleep
9999; fi']
volumeMounts:
image: busybox:1.28
command: ['sh', '-c', "mkdir /workdir; echo >
/workdir/test.txt"]
volumeMounts:
- name: test-volume
mountPath: /workdir
// Create the pod
kubectl apply -f init-cont-pod.yaml
kubectl get pods
// Check Events by doing
kubectl describe po init-cont-pod
Init Containers:
init-myservice:
Container ID:
docker://ebdbf5fad1c95111d9b0e0e2e743c2e347c81b8d4eb5abcccdfe1dd74524
0d4f
Image: busybox:1.28
Image ID: dockerpullable://busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df
416dea4f41046e0f37d47
Port: <none>
Host Port: <none>
Command:
sh
-c
mkdir /workdir; echo > /workdir/test.txt
State: Terminated Reason: Completed

Answer: A

NEW QUESTION # 69
Get list of all pods in all namespaces and write it to file "/opt/pods-list.yaml"

Answer:

Explanation:
kubectl get po -all-namespaces > /opt/pods-list.yaml

NEW QUESTION # 70
Score: 5%

Task
Monitor the logs of pod bar and:
* Extract log lines corresponding to error
* Write them to /opt/KUTR00101/bar

Answer:

Explanation:
See the solution below.
Explanation
Solution:
kubectl logs bar | grep 'unable-to-access-website' > /opt/KUTR00101/bar cat /opt/KUTR00101/bar

NEW QUESTION # 71
Score: 5%

Task
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/KUTR00401/KUTR00401.txt (which already exists).

Answer:

Explanation:
Solution:
kubectl top -l name=cpu-user -A
echo 'pod name' >> /opt/KUT00401/KUT00401.txt

NEW QUESTION # 72
You have a pod that uses a PersistentVolumeClaim for its storage. The pod is deleted, but the data on the volume is still present. Explain why the data is not deleted and how you can change this behavior.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
When a pod is deleted, the data on the volume is not automatically deleted by default. This is because the persistentVolumeReclaimPolicy' for the PersistentVolume is set to 'Retain' by default. This policy ensures that the volume is not deleted when the pod is deleted, preserving the data.
To delete the data when the pod is deleted, you need to modify the persistentVolumeReclaimPolicy' to 'Delete'. Here's how:
1. Update the PersistentVolume:
- Update the 'persistentVolumeReclaimPolicy' to 'Delete' in the PersistentVolume definition.

2. Apply the Changes: - Apply the updated PersistentVolume definition using 'kubectl apply -f my-pv.yaml'. Now, when the pod using this PersistentVolume is deleted, the volume and the data will also be deleted automatically.

NEW QUESTION # 73
......

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