Linux Foundation CKA Quiz:16 Topic:9 Questions:76-80

Free Practice Mock Questions Set 76-80 (Quiz # 16) for Linux Foundation CKA Exam, according to official Linux Foundation Certified Kubernetes Administrator exam syllabus topic # 9

Question: 1

Create a pod with init container which create a file ''test.txt''

in ''workdir'' directory. Main container should check a file

''test.txt'' exists and execute sleep 9999 if the file exists.

A// create an initial yaml file with this
kubectl run init-cont-pod --image=alpine --restart=Never --dry-run -o
yaml > init-cont-pod.yaml
// edit the yml as below and create it
vim init-cont-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: init-cont-pod
labels:
app: myapp
spec:
volumes:
- name: test-volume
emptyDir: {}
containers:
- name: main-container
image: busybox:1.28
command: ['sh', '-c', 'if [ -f /workdir/test.txt ]; then sleep
9999; fi']
volumeMounts:
- name: test-volume
mountPath: /workdir
initContainers:
- name: init-myservice
image: busybox:1.28
command: ['sh', '-c', 'mkdir /workdir; echo >
/workdir/test.txt']
volumeMounts:
- name: test-volume
mountPath: /workdir
// Create the pod
kubectl apply -f init-cont-pod.yaml
kubectl get pods
// Check Events by doing
kubectl describe po init-cont-pod
Init Containers:
init-myservice:
Container ID:
docker://ebdbf5fad1c95111d9b0e0e2e743c2e347c81b8d4eb5abcccdfe1dd74524
0d4f
Image: busybox:1.28
Image ID: dockerpullable://busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df
416dea4f41046e0f37d47
Port: <none>
Host Port: <none>
Command:
sh
-c
mkdir /workdir; echo > /workdir/test.txt
State: Terminated
Reason: Completed

B// create an initial yaml file with this
kubectl run init-cont-pod --image=alpine --restart=Never --dry-run -o
yaml > init-cont-pod.yaml
// edit the yml as below and create it
vim init-cont-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: init-cont-pod
labels:
app: myapp
spec:
volumes:
- name: test-volume
emptyDir: {}
containers:
- name: main-container
image: busybox:1.28
command: ['sh', '-c', 'if [ -f /workdir/test.txt ]; then sleep
9999; fi']
volumeMounts:
image: busybox:1.28
command: ['sh', '-c', 'mkdir /workdir; echo >
/workdir/test.txt']
volumeMounts:
- name: test-volume
mountPath: /workdir
// Create the pod
kubectl apply -f init-cont-pod.yaml
kubectl get pods
// Check Events by doing
kubectl describe po init-cont-pod
Init Containers:
init-myservice:
Container ID:
docker://ebdbf5fad1c95111d9b0e0e2e743c2e347c81b8d4eb5abcccdfe1dd74524
0d4f
Image: busybox:1.28
Image ID: dockerpullable://busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df
416dea4f41046e0f37d47
Port: <none>
Host Port: <none>
Command:
sh
-c
mkdir /workdir; echo > /workdir/test.txt
State: Terminated
Reason: Completed

Answer : A

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Question: 2

Create a pod with init container which waits for a service called ''myservice'' to be created. Once init container completes, the myapp-container should start and print a message ''The app is running'' and sleep for 3600 seconds.

Avim multi-container-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
containers:
- name: myapp-container
image: busybox:1.28
command: ['sh', '-c', 'echo The app is running! && sleep
3600']
initContainers:
- name: init-myservice
done']
// Check whether service called ''myservice'' exists
kubectl get svc
Note: Pod will not start if service called ''myservice'' doesn't
exist.
// Now, Create the pod
kubectl apply -f multi-container-pod.yaml

Bvim multi-container-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
containers:
- name: myapp-container
image: busybox:1.28
command: ['sh', '-c', 'echo The app is running! && sleep
3600']
initContainers:
- name: init-myservice
image: busybox:1.28
command: ['sh', '-c', 'until nslookup myservice.$(cat
/var/run/secrets/kubernetes.io/serviceaccount/namespace).s
vc.cluster.local; do echo waiting for myservice; sleep 2;
done']
// Check whether service called ''myservice'' exists
kubectl get svc
Note: Pod will not start if service called ''myservice'' doesn't
exist.
// Now, Create the pod
kubectl apply -f multi-container-pod.yaml

Answer : B

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Question: 3

Create 5 nginx pods in which two of them is labeled env=prod and

three of them is labeled env=dev

Akubectl run nginx-dev1 --image=nginx --restart=Never --
labels=env=dev
kubectl run nginx-dev2 --image=nginx --restart=Never --
labels=env=dev
kubectl run nginx-dev3 --image=nginx --restart=Never --
labels=env=dev
kubectl run nginx-prod1 --image=nginx --restart=Never --
labels=env=prod
kubectl run nginx-prod2 --image=nginx --restart=Never --
labels=env=prod

Bkubectl run nginx-dev1 --image=nginx --restart=Never --
labels=env=dev
kubectl run nginx-dev2 --image=nginx --restart=Never --
labels=env=dev
kubectl run nginx-prod1 --image=nginx --restart=Never --
labels=env=prod
kubectl run nginx-prod2 --image=nginx --restart=Never --
labels=env=prod

Answer : A

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Question: 4

Create a nginx pod that will be deployed to node with the label

"gpu=true"

Akubectl 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

Bkubectl 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

Answer : A

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Question: 5

Annotate the pod with name=webapp

Akubectl annotate pod nginx-dev-pod name=webapp
kubectl annotate pod nginx-prod-pod name=webapp
// Verify
kubectl describe po nginx-dev-pod | grep -i annotations

Bkubectl annotate pod nginx-dev-pod name=webapp
kubectl annotate pod nginx-prod-pod name=webapp
// Verify
kubectl describe po nginx-dev-pod | grep -i annotations
kubectl describe po nginx-prod-pod | grep -i annotations

Answer : B

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Quiz 12

Quiz 13

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Quiz 15

Quiz 16

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Quiz 20