Linux Foundation CKA : Certified Kubernetes Administrator (CKA) Program Exam

Correct Answer:

Correct Answer:

kubectl run nginx --image=nginx --restart=Never --port=80

Correct Answer:

Correct Answer:

Task Summary
You need to:
* SSH into cka000046
* Create a StorageClass named local-path using the provisioner rancher.io/local-path
* Set the volume binding mode to WaitForFirstConsumer
* Make this StorageClass the default
Step-by-Step Solution
1## SSH into the correct host
ssh cka000046
## Required. Skipping this = zero score
2## Create a StorageClass YAML file
Create a file named local-path-sc.yaml:
cat <<EOF > local-path-sc.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-path
annotations:
storageclass.kubernetes.io/is-default-class: "true"
provisioner: rancher.io/local-path
volumeBindingMode: WaitForFirstConsumer
EOF
# This:
* Sets WaitForFirstConsumer (as required)
* Marks the class as default using the correct annotation
3## Apply the StorageClass
kubectl apply -f local-path-sc.yaml
4## Verify it's the default StorageClass
kubectl get storageclass
You should see local-path with a (default) marker:
NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION
AGE
local-path rancher.io/local-path Delete WaitForFirstConsumer false 10s
Final Command Summary
ssh cka000046
cat <<EOF > local-path-sc.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-path
annotations:
storageclass.kubernetes.io/is-default-class: "true"
provisioner: rancher.io/local-path
volumeBindingMode: WaitForFirstConsumer
EOF
kubectl apply -f local-path-sc.yaml
kubectl get storageclass

Correct Answer:

Task Summary
* SSH into the correct node: cka000037
* Modify existing deployment synergy-leverager
* Add a sidecar container:
* Name: sidecar
* Image: busybox:stable
* Command:
/bin/sh -c "tail -n+1 -f /var/log/synergy-leverager.log"
* Use a shared volume mounted at /var/log
* Don't touch existing container config except adding volume mount
Step-by-Step Solution
1## SSH into the correct node
ssh cka000037
## Skipping this will result in a zero score.
2## Edit the deployment
kubectl edit deployment synergy-leverager
This opens the deployment YAML in your default editor (vi or similar).
3## Modify the spec as follows
# Inside the spec.template.spec, do these 3 things:
# A. Define a shared volume
Add under volumes: (at the same level as containers):
volumes:
- name: log-volume
emptyDir: {}
# B. Add volume mount to the existing container
Locate the existing container under containers: and add this:
volumeMounts:
- name: log-volume
mountPath: /var/log
# Do not change any other configuration for this container.
# C. Add the sidecar container
Still inside containers:, add the new container definition after the first one:
- name: sidecar
image: busybox:stable
command:
- /bin/sh
- -c
- "tail -n+1 -f /var/log/synergy-leverager.log"
volumeMounts:
- name: log-volume
mountPath: /var/log
spec:
containers:
- name: main-container
image: your-existing-image
volumeMounts:
- name: log-volume
mountPath: /var/log
- name: sidecar
image: busybox:stable
command:
- /bin/sh
- -c
- "tail -n+1 -f /var/log/synergy-leverager.log"
volumeMounts:
- name: log-volume
mountPath: /var/log
volumes:
- name: log-volume
emptyDir: {}
Save and exit
If using vi or vim, type:
bash
CopyEdit
wq
5## Verify
Check the updated pods:
kubectl get pods -l app=synergy-leverager
Pick a pod name and describe it:
kubectl describe pod <pod-name>
Confirm:
* 2 containers running (main-container + sidecar)
* Volume mounted at /var/log
ssh cka000037
kubectl edit deployment synergy-leverager
# Modify as explained above
kubectl get pods -l app=synergy-leverager
kubectl describe pod <pod-name>