Deleting Pods in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to delete a pod named 'my-pod'.

Kubernetes

kubectl delete pod [1]

Drag options to blanks, or click blank then click option'

Amy-pod

Bpods

Cdelete

Dpod-name

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pods' instead of the pod name.

Using 'delete' as the pod name.

Using a generic term like 'pod-name' instead of the actual pod name.

The command kubectl delete pod my-pod deletes the pod named 'my-pod'.

2fill in blank

medium

Complete the command to delete all pods with the label 'app=nginx'.

Kubernetes

kubectl delete pods -l [1]

Drag options to blanks, or click blank then click option'

Aname=nginx

Bapp=nginx

Capp:nginx

Dlabel=nginx

Attempts:

3 left

💡 Hint

Common Mistakes

Using ':' instead of '=' in the label selector.

Using incorrect label keys like 'name' or 'label'.

The label selector app=nginx targets pods with the label 'app' set to 'nginx'.

3fill in blank

hard

Fix the error in the command to force delete a pod named 'temp-pod'.

Kubernetes

kubectl delete pod [1] --force --grace-period=0

Drag options to blanks, or click blank then click option'

Atemp_pod

B--force

Ctemp-pod --force

Dtemp-pod

Attempts:

3 left

💡 Hint

Common Mistakes

Including flags as part of the pod name.

Using underscores instead of hyphens in the pod name.

The pod name should be 'temp-pod' without extra flags or underscores.

4fill in blank

hard

Fill both blanks to delete pods in the 'default' namespace with label 'tier=backend'.

Kubernetes

kubectl delete pods -n [1] -l [2]

Drag options to blanks, or click blank then click option'

Adefault

Bkube-system

Ctier=backend

Dapp=frontend

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong namespace like 'kube-system'.

Using incorrect label selectors.

The namespace is 'default' and the label selector is 'tier=backend' to target the correct pods.

5fill in blank

hard

Fill all three blanks to delete pods with label 'env=prod' in namespace 'staging' and wait for completion.

Kubernetes

kubectl delete pods -n [1] -l [2] --wait=[3]

Drag options to blanks, or click blank then click option'

Astaging

Benv=prod

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong namespace or label selector.

Setting '--wait' to 'false' when waiting is needed.

Namespace is 'staging', label selector is 'env=prod', and '--wait=true' makes the command wait until deletion finishes.

Practice

1. What is the basic command to delete a pod named my-pod in Kubernetes?

easy

A. kubectl delete pod my-pod

B. kubectl remove pod my-pod

C. kubectl kill pod my-pod

D. kubectl stop pod my-pod

Solution

1. Step 1: Understand the kubectl delete command

   The command kubectl delete is used to remove Kubernetes resources like pods.

2. Step 2: Apply the command to a pod named my-pod

   Using kubectl delete pod my-pod deletes the pod named my-pod.

3. Final Answer:

   kubectl delete pod my-pod -> Option A

4. Quick Check:

   Delete pod command = kubectl delete pod POD_NAME [OK]

Hint: Use 'kubectl delete pod POD_NAME' to remove pods fast [OK]

Common Mistakes:

• Using 'remove' instead of 'delete'
• Trying 'kill' or 'stop' which are invalid kubectl commands
• Omitting the resource type 'pod'

2. Which of the following is the correct syntax to delete all pods with the label app=frontend?

easy

A. kubectl delete pods --label app=frontend

B. kubectl delete pod --label app=frontend

C. kubectl delete pod -l app=frontend

D. kubectl remove pod -l app=frontend

Solution

1. Step 1: Use the correct resource type and label flag

   The resource type for pods is pod (singular) and the label selector flag is -l.

2. Step 2: Form the correct command

   The correct command is kubectl delete pod -l app=frontend to delete pods matching the label.

3. Final Answer:

   kubectl delete pod -l app=frontend -> Option C

4. Quick Check:

   Delete pods by label = kubectl delete pod -l LABEL [OK]

Hint: Use '-l' flag with 'kubectl delete pod' to delete by label [OK]

Common Mistakes:

• Using plural 'pods' instead of 'pod'
• Using '--label' instead of '-l'
• Using 'remove' instead of 'delete'

3. What will be the output after running the command kubectl delete pod my-pod if the pod my-pod exists?

medium

A. Error: pod my-pod not found

B. pod/my-pod deleted

C. pod my-pod stopped

D. pod my-pod removed

Solution

1. Step 1: Understand kubectl delete output

   When a pod is successfully deleted, kubectl outputs pod/POD_NAME deleted.

2. Step 2: Apply to pod named my-pod

   Since the pod exists, the output will be pod/my-pod deleted.

3. Final Answer:

   pod/my-pod deleted -> Option B

4. Quick Check:

   Successful delete output = pod/POD_NAME deleted [OK]

Hint: Successful delete shows 'pod/POD_NAME deleted' message [OK]

Common Mistakes:

• Expecting 'stopped' or 'removed' instead of 'deleted'
• Confusing error message with success output
• Missing the resource type prefix 'pod/'

4. You run kubectl delete pod my-pod but get an error: error: resource(s) not found. What is the most likely cause?

medium

A. The pod name is misspelled or does not exist

B. You need to use 'kubectl stop pod' instead

C. The pod is already deleted but command still runs

D. You forgot to add the namespace flag

Solution

1. Step 1: Interpret the error message

   The error resource(s) not found means Kubernetes cannot find the pod with that name.

2. Step 2: Identify common causes

   This usually happens if the pod name is wrong or the pod does not exist in the current namespace.

3. Final Answer:

   The pod name is misspelled or does not exist -> Option A

4. Quick Check:

   Resource not found = wrong pod name or missing pod [OK]

Hint: Check pod name spelling if 'resource not found' error appears [OK]

Common Mistakes:

• Using 'stop' instead of 'delete' command
• Assuming pod is deleted but error still shows
• Ignoring namespace context when pod is in another namespace

5. You want to delete all pods in the namespace dev with label tier=backend. Which command correctly does this?

hard

A. kubectl delete pod -n dev --label tier=backend

B. kubectl delete pods --namespace=dev --label tier=backend

C. kubectl delete pod --namespace dev --selector tier backend

D. kubectl delete pod -n dev --selector tier=backend

Solution

1. Step 1: Use correct flags for namespace and label selector

   The short flag for namespace is -n and for label selector is --selector or -l.

2. Step 2: Form the correct command

   The correct command is kubectl delete pod -n dev --selector tier=backend.

3. Step 3: Check other options for errors

   A uses invalid --label flag. B uses plural pods and invalid --label. C has invalid selector syntax --selector tier backend missing =.

4. Final Answer:

   kubectl delete pod -n dev --selector tier=backend -> Option D

5. Quick Check:

   Namespace and label selector flags combined correctly = kubectl delete pod -n dev --selector tier=backend [OK]

Hint: Use '-n' for namespace and '--selector' for labels to delete pods [OK]

Common Mistakes:

• Using plural 'pods' instead of 'pod'
• Wrong flag syntax like '--label' or missing '='
• Mixing long and short flags incorrectly