Linux Foundation Kubernetes Administrator CKA Questions & Answers

• Question 31:

  Create a pod that echo "hello world" and then exists. Have the pod deleted automatically when it's completed

  Correct Answer: Check the answer in explanation.

  kubectl run busybox --image=busybox -it --rm --restart=Never -- /bin/sh -c 'echo hello world' kubectl get po # You shouldn't see pod with the name "busybox"

• Question 32:

  Create a pod with environment variables as var1=value1.Check the environment variable in pod

  Correct Answer: Check the answer in explanation.

  Solution

  kubectl run nginx --image=nginx --restart=Never --env=var1=value1 # then kubectl exec -it nginx -- env # or kubectl exec -it nginx -- sh -c 'echo $var1' # or kubectl describe po nginx | grep value1

• Question 33:

  Get list of all the pods showing name and namespace with a jsonpath expression.

  Correct Answer: Check the answer in explanation.

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

• Question 34:

  Check the image version in pod without the describe command

  Correct Answer: Check the answer in explanation.

  kubectl get po nginx -o jsonpath='{.spec.containers[].image}{"\n"}'

• Question 35:

  List the nginx pod with custom columns POD_NAME and POD_STATUS

  Correct Answer: Check the answer in explanation.

  Solution

  kubectl get po -o=custom-columns="POD_NAME:.metadata.name, POD_STATUS:.status.containerStatuses[].state"

• Question 36:

  List all the pods sorted by name

  Correct Answer: Check the answer in explanation.

  kubect1 get pods --sort-by=.metadata.name

• Question 37:

  Create a pod that having 3 containers in it? (Multi-Container)

  Correct Answer: Check the answer in explanation.

  image=nginx, image=redis, image=consul Name nginx container as "nginx-container" Name redis container as "redis-container" Name consul container as "consul-container" Create a pod manifest file for a container and append container section for rest of the images kubectl run multi-container --generator=run-pod/v1 --image=nginx -- dry-run -o yaml > multi-container.yaml # then vim multi-container.yaml apiVersion: v1 kind: Pod metadata: labels: run: multi-container name: multi-container spec: containers:

  -

  image: nginx name: nginx-container

  -

  image: redis name: redis-container

  -

  image: consul name: consul-container restartPolicy: Always

• Question 38:

  Create 2 nginx image pods in which one of them is labelled with env=prod and another one labelled with env=dev and verify the same.

  Correct Answer: Check the answer in explanation.

  Solution

  kubectl run --generator=run-pod/v1 --image=nginx -- labels=env=prod nginx-prod --dry-run -o yaml > nginx-prodpod.yaml Now, edit nginx-prod-pod.yaml file and remove entries like "creationTimestamp:

  null" "dnsPolicy: ClusterFirst"

  vim nginx-prod-pod.yaml

  apiVersion: v1

  kind: Pod

  metadata:

  labels:

  env: prod

  name: nginx-prod

  spec:

  containers:

  -

  image: nginx name: nginx-prod restartPolicy: Always # kubectl create -f nginx-prod-pod.yaml kubectl run --generator=run-pod/v1 --image=nginx -labels=env=dev nginx-dev --dry-run -o yaml > nginx-dev-pod.yaml apiVersion: v1 kind: Pod metadata: labels: env: dev name: nginx-dev spec: containers:

  -

  image: nginx name: nginx-dev restartPolicy: Always # kubectl create -f nginx-prod-dev.yaml Verify : kubectl get po --show-labels kubectl get po -l env=prod kubectl get po -l env=dev

• Question 39:

  Get IP address of the pod - "nginx-dev"

  Correct Answer: Check the answer in explanation.

  Kubect1 get po -o wide Using JsonPath kubect1 get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'

• Question 40:

  Print pod name and start time to "/opt/pod-status" file

  Correct Answer: Check the answer in explanation.

  Solution

  kubect1 get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'