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Linux Foundation CKA Exam Syllabus Topics:

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

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q61-Q66):

NEW QUESTION # 61
A Kubernetes worker node, named wk8s-node-0 is in state NotReady. Investigate why this is the case, and perform any appropriate steps to bring the node to a Ready state, ensuring that any changes are made permanent.
You can ssh to the failed node using:
[student@node-1] $ | ssh Wk8s-node-0
You can assume elevated privileges on the node with the following command:
[student@w8ks-node-0] $ | sudo -i

Answer:

Explanation:

NEW QUESTION # 62
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
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
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
- 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

Answer: A

NEW QUESTION # 63
List all the pods sorted by name

Answer:

Explanation:
See the solution below.
Explanation
kubect1 get pods --sort-by=.metadata.name

NEW QUESTION # 64
You are managing a Kubernetes cluster with a team of developers. You need to ensure that each developer only has access to the resources they need. For example, Developer A can only access the 'frontend' namespace and deploy applications there.
Developer B can access the 'backend' namespace and manage deployments and services.
Developer C can access the 'monitoring' namespace and access only read-only access to pods and services.
Define the RBAC rules and create the necessary Role, RoleBinding, and ServiceAccount resources to achieve this access control policy.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1 . Create ServiceAccounts for each Developer:
kubectl create serviceaccount dev-a -n frontend
kubectl create serviceaccount dev-b -n backend
kubectl create serviceaccount dev-c -n monitoring
2. Create Roles for each Developer:
For Developer A:

For Developer B:

For Developer C:

3. Create RoleBindings: For Developer A:

For Developer B:

For Developer C:

NEW QUESTION # 65
Create a redis pod named "test-redis" and exec into that pod and create a file named "test-file.txt" with the text 'This is called the test file' in the path /data/redis and open another tab and exec again with the same pod and verifies file exist in the same path.

A. vim test-redis.yaml
apiVersion: v1
kind: Pod
metadata:
name: test-redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6379
volumeMounts:
- mountPath: /data/redis
name: redis-storage
volumes:
- name: redis-storage
emptyDir: {}
kubectl apply -f redis-pod-vol.yaml
// first terminal
kubectl exec -it test-redis /bin/sh
cd /data/redis
echo 'This is called the test file' > file.txt
//open another tab
kubectl exec -it test-redis /bin/sh
cat /data/redis/file.txt
B. vim test-redis.yaml
apiVersion: v1
kind: Pod
metadata:
name: test-redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6379
volumeMounts:
- mountPath: /data/redis
name: redis-storage
volumes:
kubectl exec -it test-redis /bin/sh
cd /data/redis
echo 'This is called the test file' > file.txt
//open another tab
kubectl exec -it test-redis /bin/sh
cat /data/redis/file.txt

Answer: A

NEW QUESTION # 66
......

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