CKAD Application Deployment Practice Test 11 — 15 Questions

Question 1

Which command is used to rollback a Deployment to the previous revision?

Accepted Answer

kubectl rollout undo deployment my-deployment. 'kubectl rollout undo deployment my-deployment'. Option B rolls forward? Option C is not valid. Option D is for history.

Answer

kubectl rollout redo deployment my-deployment

Answer

kubectl rollout revert deployment my-deployment

Answer

kubectl rollout history deployment my-deployment

Question 2

During a rolling update of a Deployment with 10 replicas, you set maxSurge to 3 and maxUnavailable to 2. What is the maximum number of pods that can be unavailable during the update?

Accepted Answer

2. maxUnavailable: 2 means at most 2 pods can be unavailable. Option C is correct.

Answer

5

Answer

3

Answer

10

Question 3

Your Deployment is stuck during rollout, and you want to investigate. Which command pauses the rollout and allows you to check the current state?

Accepted Answer

kubectl rollout pause deployment my-deployment. The correct command to pause a deployment rollout is `kubectl rollout pause deployment my-deployment`. While paused, you can inspect the current state with `kubectl rollout status` or other diagnostic commands. Option A (`kubectl rollout resume`) resumes a paused rollout, not pauses it. Option B (`kubectl rollout status`) shows the rollout state but does not pause it. Option D (`kubectl rollout stop`) is not a valid kubectl command; the correct command to stop a rollout is `kubectl rollout undo`. Therefore, only option C pauses the rollout as required.

Answer

kubectl rollout resume deployment my-deployment

Answer

kubectl rollout status deployment my-deployment

Answer

kubectl rollout stop deployment my-deployment

Question 4

You want to add an annotation to a pod without modifying the pod template. Which approach should you use?

Accepted Answer

kubectl annotate pod my-pod key=value. 'kubectl annotate pod my-pod key=value' adds an annotation directly to the existing pod without modifying the pod template. Option A uses 'kubectl annotate deployment', which adds an annotation to the Deployment object itself, not to the pod. Option B uses 'kubectl label', which adds labels, not annotations. Option C uses 'kubectl edit', which is not a direct annotation command and may be less efficient.

Answer

kubectl annotate deployment my-deployment key=value

Answer

kubectl label pod my-pod key=value

Answer

kubectl edit pod my-pod and add annotation manually

Question 5

Which of the following are valid methods to perform a blue-green deployment? (Choose TWO)

Accepted Answer

Create two Deployments for blue and green, and update the Service selector to point to the new version. Blue-green deployment in Kubernetes typically involves running two environments (blue and green) side-by-side and switching traffic from one to the other. Option A directly implements this by maintaining two separate Deployments (blue and green) and updating the Service selector to point to the new version. Option D uses an Ingress resource that can route traffic to different Services, each pointing to a different version of the application; by updating the Ingress rules, traffic can be switched from blue to green. Option B describes a rolling update, not blue-green. Option C is a rolling update using a single Deployment and changing the container image. Option E is a delete/recreate strategy, not blue-green.

Answer

Create a single Deployment and update the pod labels to match the Service selector

Answer

Use a single Deployment and change the container image, then perform a rolling update

Answer

Delete the old Deployment and create a new one

Question 6

A Deployment named 'api' has 6 replicas. You want to perform a rolling update with the following constraints: at most 2 pods can be unavailable during the update, and at most 1 extra pod can be created above the desired 6. Which strategy configurations achieve this? (Choose TWO)

Accepted Answer

strategy:
  rollingUpdate:
    maxSurge: 1
    maxUnavailable: 2. Uses absolute numbers: maxSurge=1 and maxUnavailable=2, directly matching the constraints. Option B uses percentages: 16% of 6 = 0.96 rounded up to 1, and 33% of 6 = 1.98 rounded up to 2, so it also yields maxSurge=1 and maxUnavailable=2. Option C has maxSurge=2, exceeding the surge limit. Option D has maxUnavailable=3, exceeding the unavailable limit. Option E has maxUnavailable=1, which is more restrictive than the allowed maximum of 2; while it technically satisfies the constraint, it is not the intended configuration. Therefore, the correct answers are A and B.

Answer

strategy:
  rollingUpdate:
    maxSurge: 2
    maxUnavailable: 2

Answer

strategy:
  rollingUpdate:
    maxSurge: 1
    maxUnavailable: 3

Answer

strategy:
  rollingUpdate:
    maxSurge: 1
    maxUnavailable: 1

Question 7

You are using Helm to manage a chart. Which commands are valid to list installed releases? (Choose TWO)

Accepted Answer

helm ls. `helm ls` and `helm list` are both valid commands to list installed releases in Helm. `helm ls` is an alias for `helm list`, and both display all deployed releases in the current namespace by default. These commands are essential for managing Helm-based deployments.

Answer

helm upgrade

Answer

helm status

Answer

helm history

Question 8

Which kubectl command is used to view the rollout status of a Deployment?

Accepted Answer

kubectl rollout status deployment mydeployment. The 'kubectl rollout status' command is specifically designed to show the status of a rollout for a Deployment, DaemonSet, or StatefulSet.

Answer

kubectl status deployment mydeployment

Answer

kubectl get rollout deployment mydeployment

Answer

kubectl describe rollout mydeployment

Question 9

A Deployment named 'app' has the following strategy: type: RollingUpdate with maxSurge=1 and maxUnavailable=0. You have 5 replicas. During a rolling update, how many pods will be running at any given time?

Accepted Answer

Between 5 and 6. With maxUnavailable=0, no pods can be unavailable during the update. With maxSurge=1, one extra pod can be created above the desired 5, so total running pods can be 6. The new pod is created first, then the old pod is terminated, ensuring 5 pods are always available.

Answer

Between 4 and 5

Answer

Between 5 and 10

Answer

Exactly 5

Question 10

You run 'kubectl rollout undo deployment/app'. What happens?

Accepted Answer

It rolls back the Deployment to the previous revision. The 'kubectl rollout undo' command rolls back a Deployment to the previous revision. By default, it reverts to the immediate prior revision (revision 1 less than current).

Answer

It pauses the rollout

Answer

It shows the rollout history

Answer

It deletes the Deployment

Question 11

Which command is used to scale a Deployment named 'web' to 5 replicas?

Accepted Answer

kubectl scale deployment web --replicas=5. `kubectl scale deployment web --replicas=5` directly updates the `spec.replicas` field of the Deployment to 5, instructing the ReplicaSet controller to adjust the number of Pods to match the desired count. This is the standard imperative command for scaling workloads in Kubernetes.

Answer

kubectl autoscale deployment web --min=5 --max=5

Answer

kubectl set replicas deployment/web 5

Answer

kubectl edit deployment web --replicas=5

Question 12

A Deployment is configured with strategy type 'Recreate'. What happens during an update to the pod template?

Accepted Answer

Old pods are terminated and then new pods are created. The Recreate strategy first terminates all existing pods, then creates new pods. This ensures that only one version is running at a time, but causes downtime.

Answer

New pods are created before old ones are terminated

Answer

Pods are updated in place

Answer

The update is paused until manual approval

Question 13

You have a Deployment with 3 replicas. You run 'kubectl rollout pause deployment/app'. Which command would you use to resume the rollout?

Accepted Answer

kubectl rollout resume deployment/app. `kubectl rollout resume deployment/app` is the specific command to resume a paused rollout, allowing the Deployment controller to continue processing updates to the Pod template. When a rollout is paused with `kubectl rollout pause`, the controller stops applying changes to the ReplicaSet; `resume` re-enables that reconciliation loop.

Answer

kubectl rollout continue deployment/app

Answer

kubectl rollout undo deployment/app

Answer

kubectl rollout restart deployment/app

Question 14

You are using Helm to manage an application. After running 'helm install myapp ./mychart', you notice that the application is running but you need to change a configuration value. Which command should you use to update the release?

Accepted Answer

helm upgrade myapp ./mychart --set key=value. In Helm, to upgrade an existing release with new values, you use 'helm upgrade' with the release name and chart. You can pass new values via --set or --values.

Answer

helm update myapp ./mychart

Answer

helm install myapp ./mychart --replace

Answer

kubectl edit deployment myapp

Question 15

What is the difference between 'kubectl apply' and 'kubectl create'?

Accepted Answer

'kubectl apply' can be used to create and update resources; 'kubectl create' only creates new resources. 'kubectl apply' is declarative: it creates or updates a resource to match the provided configuration. 'kubectl create' is imperative: it creates a new resource and will fail if the resource already exists.

Answer

'kubectl apply' only works with Deployments, while 'kubectl create' works with all resources

Answer

'kubectl apply' is for creating resources, 'kubectl create' is for updating

Answer

There is no difference