CKA 시험 - CNCF실제시험문제와 답 - 122문항

Question No : 1

Create an nginx pod and set an env value as 'var1=val1'. Check the env value existence within the pod

A.Solution: kubectl run nginx --image=nginx --restart=Never --env=var1=val1 # then kubectl exec -it nginx -- env # or kubectl exec -it nginx -- sh -c 'echo $var1' # or kubectl describe po nginx | grep val1 # or kubectl run nginx --restart=Never --image=nginx --env=var1=val1 -it --rm - env

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Question No : 2

Exec into both containers and verify that main.txt exist and

A.Solution: NEED TO WRITE ANSWER FOR THIS

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Question No : 3

Create a Pod with main container busybox and which executes this "while true; do echo `Hi I am from Main container' >> /var/log/index.html; sleep 5; done" and with sidecar container with nginx image which exposes on port 80. Use emptyDir Volume and mount this volume on path /var/log for busybox and on path /usr/share/nginx/html for nginx container. Verify both containers are running.

A.Solution: // create an initial yaml file with this kubectl run multi-cont-pod --image=busbox --restart=Never -- dry-run -o yaml > multi-container.yaml // edit the yml as below and create it kubectl create -f multi-container.yaml vim multi-container.yaml apiVersion: v1 kind: Pod metadata: labels: run: multi-cont-pod name: multi-cont-pod spec: volumes: - name: var-logs emptyDir: {} containers: - image: busybox command: ["/bin/sh"] args: ["-c", "while true; do echo 'Hi I am from Main container' >> /var/log/index.html; sleep 5;done"] name: main-container volumeMounts: - name: var-logs mountPath: /var/log - image: nginx name: sidecar-container ports: - containerPort: 80 volumeMounts: - name: var-logs mountPath: /usr/share/nginx/html restartPolicy: Never // Create Pod kubectl apply -f multi-container.yaml //Verify kubectl get pods

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Question No : 4

Check logs of each container that "busyboxpod-{1,2,3}"

A.Solution: kubectl logs busybox -c busybox-container-1 kubectl logs busybox -c busybox-container-2 kubectl logs busybox -c busybox-container-3

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Question No : 5

Create a Pod with three busy box containers with commands "ls; sleep 3600;", "echo Hello World; sleep 3600;" and "echo this is the third container; sleep 3600" respectively and check the status

A.Solution: // first create single container pod with dry run flag kubectl run busybox --image=busybox --restart=Always --dry-run -o yaml -- bin/sh -c "sleep 3600; ls" > multi-container.yaml // edit the pod to following yaml and create it apiVersion: v1 kind: Pod metadata: labels: run: busybox name: busybox spec: containers: - args: - bin/sh - -c - ls; sleep 3600 image: busybox name: busybox-container-1 - args: - bin/sh - -c - echo Hello world; sleep 3600 image: busybox name: busybox-container-2 - args: - bin/sh - -c - echo this is third container; sleep 3600 image: busybox name: busybox-container-3 restartPolicy: Always // Verify Kubectl get pods

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Question No : 6

Create a redis pod, and have it use a non-persistent storage Note: In exam, you will have access to kubernetes.io site, Refer : https://kubernetes.io/docs/tasks/configure-pod-container/configurevolume-storage/

A.Solution: apiVersion: v1 kind: Pod metadata: name: redis spec: containers: - name: redis image: redis volumeMounts: - name: redis-storage mountPath: /data/redis ports: - containerPort: 6379 volumes: - name: redis-storage emptyDir: {}

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Question No : 7

Change the Image version back to 1.17.1 for the pod you just updated and observe the changes

A.Solution: kubectl set image pod/nginx nginx=nginx:1.17.1 kubectl describe po nginx kubectl get po nginx -w # watch it

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Question No : 8

Change the Image version to 1.15-alpine for the pod you just created and verify the image version is updated.

A.Solution: Kubect1 set image pod/nginx nginx=nginx:1.15-alpine kubect1 describe po nginx // another way it will open vi editor and change the version kubeclt edit po nginx kubect1 describe po nginx

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Question No : 9

Create the nginx pod with version 1.17.4 and expose it on port 80

A.Solution: kubectl run nginx --image=nginx:1.17.4 --restart=Never -- port=80

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Question No : 10

Create a redis pod and expose it on port 6379

A.Solution: kubectl run redis --image=redis --restart=Never --port=6379 YAML File : apiVersion: v1 kind: Pod metadata: labels: run: redis name: redis spec: containers: - image: redis name: redis ports: - containerPort: 6379 Rt restartPolicy: Always

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Question No : 11

Delete the pod without any delay (force delete)

A.Solution: Kubect1 delete po "POD-NAME" --grace-period=0 -force

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Question No : 12

List "nginx-dev" and "nginx-prod" pod and delete those pods

A.Solution: kubect1 get pods -o wide kubectl delete po "nginx-dev" kubectl delete po "nginx-prod"

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Question No : 13

List all the pods showing name and namespace with a json path expression

A.Solution: kubectl get pods -o=jsonpath="{.items[*]['metadata.name', 'metadata.namespace']}"

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Question No : 14

List all the pods sorted by created timestamp

A.Solution: kubect1 get pods--sort-by=.metadata.creationTimestamp

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Question No : 15

List all the pods sorted by name

A.Solution: kubectl get pods --sort-by=.metadata.name

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CNCF CKA 시험