Linux Foundation CKA - Certified Kubernetes Administrator (CKA) Program

solution

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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

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

Solution:

kubectl top -l name=cpu-user -A

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

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Task Summary

You need to:

SSH into the correct node: cka000055

Use kubectl to list all cert-manager CRDs, and save that list to ~/resources.yaml

Do not use any output format flags like -o yaml

Extract the documentation for the spec.subject field of the Certificate custom resource and save it to ~/subject.yaml

Step-by-Step Instructions

Step 1: SSH into the node

ssh cka000055

Step 2: List cert-manager CRDs and save to a file

First, identify all cert-manager CRDs:

kubectl get crds | grep cert-manager

Then extract them without specifying an output format:

kubectl get crds | grep cert-manager | awk '{print $1}' | xargs kubectl get crd > ~/resources.yaml

This saves the default kubectl get output to the required file without formatting flags.

Step 3: Get documentation for spec.subject in the Certificate CRD

Run the following command:

kubectl explain certificate.spec.subject > ~/subject.yaml

This extracts the field documentation and saves it to the specified file.

If you're not sure of the resource, verify it exists:

kubectl get crd certificates.cert-manager.io

Final Command Summary

ssh cka000055

kubectl get crds | grep cert-manager | awk '{print $1}' | xargs kubectl get crd > ~/resources.yaml

kubectl explain certificate.spec.subject > ~/subject.yaml

Solution:

Task should be complete on node k8s -1 master, 2 worker for this connect use command

[student@node-1] > ssh k8s

kubectl create clusterrole deployment-clusterrole --verb=create --resource=deployments,statefulsets,daemonsets

kubectl create serviceaccount cicd-token --namespace=app-team1

kubectl create rolebinding deployment-clusterrole --clusterrole=deployment-clusterrole --serviceaccount=default:cicd-token --namespace=app-team1

kubect1 get pods -o=jsonpath='{range

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

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

solution

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