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Linux Foundation CKA Exam Syllabus Topics:

Section	Weight	Objectives
Storage	10%	- StatefulSet storage configuration - StorageClasses and dynamic provisioning - Volume types and access modes - Persistent Volumes (PV) and Persistent Volume Claims (PVC)
Cluster Architecture, Installation & Configuration	25%	- Work with CRDs and Operators - Understand CNI, CSI, CRI interfaces - Manage cluster lifecycle and upgrades - Install components via Helm / Kustomize - Prepare infrastructure for cluster installation - Manage RBAC - Implement high availability control plane - Create and manage clusters with kubeadm
Services & Networking	20%	- CNI configuration and troubleshooting - CoreDNS and service discovery - Ingress resources and controllers - Network policies - Service types: ClusterIP, NodePort, LoadBalancer, ExternalName
Workloads & Scheduling	15%	- Pod scheduling: node selector, affinity, taints/tolerations - Configure applications with ConfigMaps and Secrets - Resource requests, limits and autoscaling - Pod lifecycle, init containers, probes - Deployments, rolling updates and rollbacks
Troubleshooting	30%	- Network connectivity and DNS resolution problems - Pod and application failures - Worker node issues and recovery - Log collection and analysis - Cluster component health checks - Control plane component failures

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q43-Q48):

NEW QUESTION # 43
You have a Kubernetes cluster with a NodePort service exposing a web application on port 30080. You need to restrict access to this service from specific IP addresses (192.168.1.10 and 10.0.0.1) using NetworkPolicy.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Create the necessary NetworkPolicy to enforce this restriction.
Solution (Step by Step) :
Step 1: Create a NetworkPolicy to restrict access to the web application service.

Step 2: Apply the NetworkPolicy to the cluster. kubectl apply -f web-app-access-restriction.yaml This NetworkPolicy will restrict ingress traffic to the web application service to only the specified IP addresses. The 'podSelector: {F ensures that this policy applies to all pods in the 'default' namespace. The 'egress' section allows all outbound traffic from the pods. Now, only the specified IP addresses can access the web application service exposed through NodePort.,

NEW QUESTION # 44
Create a daemonset named "Prometheus-monitoring" using image=prom/Prometheus which runs in all the nodes in the cluster. Verify the pod running in all the nodes

A. vim promo-ds.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: prometheus-monitoring
spec:
selector:
matchLabels:
name: prometheus
template:
metadata:
labels:
name: prometheus
spec:
tolerations:
# remove it if your masters can't run pods
- key: node-role.kubernetes.io/master
effect: NoSchedule
containers:
- name: prometheus-container
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
volumes:
- name: varlog
emptyDir: {}
- name: varlibdockercontainers
emptyDir: {}
kubectl apply -f promo-ds.yaml
NOTE: Deamonset will get scheduled to "default" namespace, to
schedule deamonset in specific namespace, then add
"namespace" field in metadata
//Verify
kubectl get ds
NAME DESIRED CURRENT READY UP-TO-DATE
AVAILABLE NODE SELECTOR AGE
prometheus-monitoring 8 8 0 6
0 <none> 7s
kubectl get no # To get list of nodes in the cluster
// There are 6 nodes in the cluster, so a pod gets scheduled to
each node in the cluster
B. vim promo-ds.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: prometheus-monitoring
spec:
selector:
matchLabels:
name: prometheus
template:
metadata:
labels:
name: prometheus
spec:
tolerations:
# remove it if your masters can't run pods
- key: node-role.kubernetes.io/master
effect: NoSchedule
containers:
- name: prometheus-container
image: prom/prometheus
volumeMounts:
- name: varlog
mountPath: /var/log
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
volumes:
- name: varlog
emptyDir: {}
- name: varlibdockercontainers
emptyDir: {}
kubectl apply -f promo-ds.yaml
NOTE: Deamonset will get scheduled to "default" namespace, to
schedule deamonset in specific namespace, then add
"namespace" field in metadata
//Verify
kubectl get ds
NAME DESIRED CURRENT READY UP-TO-DATE
AVAILABLE NODE SELECTOR AGE
prometheus-monitoring 6 6 0 6
0 <none> 7s
kubectl get no # To get list of nodes in the cluster
// There are 6 nodes in the cluster, so a pod gets scheduled to
each node in the cluster

Answer: B

NEW QUESTION # 45
Create a nginx pod that will be deployed to node with the label
"gpu=true"

A. kubectl run nginx --image=nginx --restart=Always --dry-run -o
yaml > nodeselector-pod.yaml
// add the nodeSelector like below and create the pod
kubectl apply -f nodeselector-pod.yaml
vim nodeselector-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
nodeSelector:
gpu: true
yaml
//Verify
kubectl get no -show-labels
kubectl get po
kubectl describe po nginx | grep Node-Selectors
B. kubectl run nginx --image=nginx --restart=Always --dry-run -o
yaml > nodeselector-pod.yaml
// add the nodeSelector like below and create the pod
kubectl apply -f nodeselector-pod.yaml
vim nodeselector-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
nodeSelector:
gpu: true
containers:
- image: nginx
name: nginx
restartPolicy: Always
kubectl apply -f nodeselector-pod.yaml
//Verify
kubectl get no -show-labels
kubectl get po
kubectl describe po nginx | grep Node-Selectors

Answer: B

NEW QUESTION # 46
Scale the deployment to 5 replicas

Answer:

Explanation:
kubectl scale deployment webapp -replicas=5 //Verify kubectl get deploy kubectl get po,rs

NEW QUESTION # 47
Describe the difference between 'ReadWriteOnce' and access modes for PersistentVolumeClaims. In what scenarios would you choose each?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
ReadWriteOnce:
- Description: This mode allows only one pod to mount the volume at a time.
- Scenarios: Ideal for applications requiring exclusive access to the storage, such as databases where data integrity is crucial. Examples include:
- Single-instance databases (e.g., MySQL, PostgreSQL)
- Applications that modify files concurrently and need to ensure consistency.
ReadWriteMany:
- Description: This mode allows multiple pods to mount the volume simultaneously.
- Scenarios: Suitable for applications that need shared access to data, such as shared storage for applications, I configuration files, or log files. Examples include:
- Shared file systems (e.g., NFS, GlusterFS)
- Applications where multiple pods need to access the same data simultaneously.

NEW QUESTION # 48
......

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