(CKA) MOCK 1 풀이와 관련 공식 문서

문제 1

 

Deploy a pod named nginx-pod using the nginx:alpine image. Once done, click on the Next Question button in the top right corner of this panel. You may navigate back and forth freely between all questions. Once done with all questions, click on End Exam. Your work will be validated at the end and score shown. Good Luck!

Name: nginx-pod
Image: nginx:alpine

 

문제 1 답

vi nginx-pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  containers:
  - name: nginx
    image: nginx:alpine

 

kubectl apply -f nginx-pod.yaml

 

문제 1 관련 공식 문서

Pods

 

문제 2

Deploy a messaging pod using the redis:alpine image with the labels set totier=msg.

Pod Name: messaging
Image: redis:alpine
Labels: tier=msg

 

문제 2 답

vi messaging.yaml

apiVersion: v1
kind: Pod
metadata:
  name: messaging
  labels:
    tier: msg
spec:
  containers:
  - name: redis
    image: redis:alpine

kubectl apply -f messaging.yaml

 

문제 2 관련 공식문서

Pods

Labels and Selectors

 

문제 3

Create a namespace named apx-x9984574.
Namespace: apx-x9984574

 

문제 3 답

kubectl create namespace apx-x9984574

 

문제 3 관련 공식문서

Namespaces

 

문제 4

Get the list of nodes in JSON format and store it in a file at /opt/outputs/nodes-z3444kd9.json.
Task completed

 

문제 4 답

kubectl get nodes -o json > /opt/outputs/nodes-z3444kd9.json

 

 

문제 4 관련 공식문서

Command line tool (kubectl)

 

문제 5

Create a service messaging-service to expose the messaging application within the cluster on port 6379. Use imperative commands.

Service: messaging-service
Port: 6379
Type: ClusterIp Use the right labels

문제 5 답 1

kubectl create service clusterip messaging-service --tcp=6379:6379 --dry-run=client -o yaml | kubectl apply -f -

문제 5 답 2 

# 문제에 이미지가 없어 우선 nginx-alpine으로 대체한다.
kubectl create deployment messaging-deployment --image=nginx:alpine

kubectl expose deployment messaging-deployment --name=messaging-service --port=6379 --target-port=6379 --type=ClusterIP --labels=app=messaging

 

문제 5 관련 공식문서

Service

 

 

문제 6

 

Create a deployment named hr-web-app using the image kodekloud/webapp-color with 2 replicas.

Name: hr-web-app
Image: kodekloud/webapp-color
Replicas: 2

 

문제 6 답

kubectl create deployment hr-web-app --image=kodekloud/webapp-color --replicas=2

 

문제 6 관련 공식문서

Deployments

 

 

문제 7

Create a static pod named static-busybox on the controlplane node that uses the busybox image and the command sleep 1000.

Name: static-busybox
Image: busybox

 

문제 7 답

cd /etc/kubernetes/manifests/

cat <<EOF > /etc/kubernetes/manifests/static-busybox.yaml
apiVersion: v1
kind: Pod
metadata:
  name: static-busybox
spec:
  containers:
  - name: busybox
    image: busybox
    command: ["sleep", "1000"]
EOF

 

 

문제 7 관련 공식문서

Create static Pods

 

 

문제 8

Create a POD in the finance namespace named temp-bus with the image redis:alpine.

Name: temp-bus
Image Name: redis:alpine

 

문제 8 답

kubectl create namespace finance

kubectl run temp-bus --image=redis:alpine --namespace=finance

 

문제 8 관련 공식문서

kubectl run

 

 

문제 9

A new application orange is deployed. There is something wrong with it. Identify and fix the issue.

 

문제 9 답

kubectl describe pod orange

kubectl get pod orange -o yaml > orange.yaml

vi orange.yaml

kubectl delete pod orange

kubectl apply -f orange.yaml

 

문제 9 관련 공식문서

Debug Pods

 

 

문제 10

Expose the hr-web-app as service hr-web-app-service application on port 30082 on the nodes on the cluster. The web application listens on port 8080.

Name: hr-web-app-service
Type: NodePort
Endpoints: 2
Port: 8080
NodePort: 30082

 

문제 10 답

kubectl create service nodeport hr-web-app-service --tcp=8080:8080 --node-port=30082

 

문제 10 관련 공식문서

https://kubernetes.io/docs/concepts/services-networking/service/#nodeport

Service

 

문제 11

Use JSON PATH query to retrieve the osImages of all the nodes and store it in a file /opt/outputs/nodes_os_x43kj56.txt. The osImages are under the nodeInfo section under status of each node. Task Completed

 

문제 11 답

kubectl get nodes -o jsonpath='{range .items[*]}{.status.nodeInfo.osImage}{"\n"}{end}'

 

문제 11 관련 공식 문서

JSONPath Support

 

 

문제 12

Create a Persistent Volume with the given specification:

Volume name: pv-analytics
Storage: 100Mi
Access mode: ReadWriteMany
Host path: /pv/data-analytics

Is the volume name set?
Is the storage capacity set?
Is the accessMode set?
Is the hostPath set?

 

문제 12 답

vi pv-analytics.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-analytics
spec:
  capacity:
    storage: 100Mi
  accessModes:
  - ReadWriteMany
  hostPath:
    path: /pv/data-analytics

kubectl apply -f pv-analytics.yaml

 

 

문제 12 관련 공식 문서

Persistent Volumes