Pass the Linux Foundation Kubernetes Administrator CKA Questions and answers with ValidTests

Task Summary

Create an HPA named apache-server in the autoscale namespace.

Target an existing deployment also named apache-server.

CPU target: 50%

Pod range: min 1, max 4

Downscale stabilization window: 30 seconds

Step-by-Step Answer

???? Step 1: Connect to the correct host

This is critical, as shown in the warning image.

ssh cka000050

???? Skipping this may result in zero for this question!

???? Step 2: Verify the deployment exists

kubectl get deployment apache-server -n autoscale

Make sure it’s there before creating the HPA. If it’s missing, the HPA won't bind correctly.

⚙️ Step 3: Create the HPA

We will use the kubectl autoscale command for a quick setup, then patch it to add the stabilization window (since kubectl autoscale doesn't include it).

kubectl autoscale deployment apache-server \

--namespace autoscale \

--cpu-percent=50 \

--min=1 \

--max=4

???? Step 4: Add the downscale stabilization window

You’ll need to patch the HPA to include the stabilization window of 30s.

Create a patch file called hpa-patch.yaml:

spec:

behavior:

scaleDown:

stabilizationWindowSeconds: 30

Apply the patch:

bash

CopyEdit

kubectl patch hpa apache-server \

-n autoscale \

--patch "$(cat hpa-patch.yaml)"

✅ Step 5: Confirm your work

bash

CopyEdit

kubectl describe hpa apache-server -n autoscale

Look for:

Min/Max Pods: 1/4

Target CPU utilization: 50%

Stabilization window: should appear under Behavior > ScaleDown

ssh cka000050

kubectl get deployment apache-server -n autoscale

kubectl autoscale deployment apache-server \

--namespace autoscale \

--cpu-percent=50 \

--min=1 \

--max=4

# Patch to add stabilization window

cat < hpa-patch.yaml

spec:

behavior:

scaleDown:

stabilizationWindowSeconds: 30

EOF

kubectl patch hpa apache-server -n autoscale --patch "$(cat hpa-patch.yaml)"

Solution:

kubectl run kucc8 --image=nginx --dry-run -o yaml > kucc8.yaml

# vi kucc8.yaml

apiVersion: v1

kind: Pod

metadata:

creationTimestamp: null

name: kucc8

spec:

containers:

- image: nginx

name: nginx

- image: redis

name: redis

- image: memcached

name: memcached

- image: consul

name: consul

#

kubectl create -f kucc8.yaml

#12.07

Solution:

kubectl top -l name=cpu-user -A

echo 'pod name' >> /opt/KUT00401/KUT00401.txt

solution

F:\Work\Data Entry Work\Data Entry\20200827\CKA\2 C.JPG

kubect1 get pods -o=jsonpath='{range

items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'

solution

F:\Work\Data Entry Work\Data Entry\20200827\CKA\3 B.JPG

F:\Work\Data Entry Work\Data Entry\20200827\CKA\3 C.JPG

F:\Work\Data Entry Work\Data Entry\20200827\CKA\3 D.JPG

F:\Work\Data Entry Work\Data Entry\20200827\CKA\3 E.JPG

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

Solution:

#vi pv.yaml

apiVersion: v1

kind: PersistentVolume

metadata:

name: app-config

spec:

capacity:

storage: 1Gi

accessModes:

- ReadOnlyMany

hostPath:

path: /srv/app-config

#

kubectl create -f pv.yaml

kubectl run nginx --image=nginx --restart=Never --labels=env=test --namespace=engineering --dry-run -o yaml > nginx-pod.yaml

kubectl run nginx --image=nginx --restart=Never --labels=env=test --namespace=engineering --dry-run -o yaml | kubectl create -n engineering -f –

YAML File:

apiVersion: v1

kind: Pod

metadata:

name: nginx

namespace: engineering

labels:

env: test

spec:

containers:

- name: nginx

image: nginx

imagePullPolicy: IfNotPresent

restartPolicy: Never

kubectl create -f nginx-pod.yaml

kubectl get po -o=custom-columns="POD_NAME:.metadata.name,

POD_STATUS:.status.containerStatuses[].state"