kubectl delete for removal 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 [1] my-pod

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

Apod

Bget

Capply

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' instead of 'delete' to remove resources.

Forgetting to specify the resource type like 'pod'.

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

2fill in blank

medium

Complete the command to delete a deployment named 'web-app'.

Kubernetes

kubectl delete [1] web-app

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

Aservice

Bconfigmap

Cdeployment

Dnode

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'service' or 'node' instead of 'deployment' for deleting deployments.

Misspelling the resource name.

Use kubectl delete deployment web-app to remove the deployment named 'web-app'.

3fill in blank

hard

Fix the error in the command to delete a service named 'backend'.

Kubernetes

kubectl [1] service backend

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

Acreate

Bget

Cdescribe

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' or 'get' instead of 'delete' to remove resources.

Omitting the resource type 'service'.

The correct command to remove a service is kubectl delete service backend.

4fill in blank

hard

Fill both blanks to delete a configmap named 'app-config' in the 'dev' namespace.

Kubernetes

kubectl delete [1] app-config -n [2]

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

Aconfigmap

Bpod

Cdev

Dprod

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong resource type like 'pod' instead of 'configmap'.

Using the wrong namespace name.

Use kubectl delete configmap app-config -n dev to delete the configmap in the 'dev' namespace.

5fill in blank

hard

Fill all three blanks to delete a pod named 'cache-pod' with a grace period of 0 seconds.

Kubernetes

kubectl delete [1] cache-pod --grace-period=[2] --force=[3]

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

Apod

B0

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-zero grace period when immediate deletion is needed.

Setting force to false or omitting it.

The command kubectl delete pod cache-pod --grace-period=0 --force=true force deletes the pod immediately.

Practice

1. What does the command kubectl delete pod my-pod do in Kubernetes?

easy

A. It removes the pod named 'my-pod' from the cluster.

B. It creates a new pod named 'my-pod'.

C. It lists all pods including 'my-pod'.

D. It updates the pod named 'my-pod'.

Solution

1. Step 1: Understand the command action

   The command kubectl delete is used to remove resources from the cluster.

2. Step 2: Identify the resource and name

   Here, the resource is a pod and the name is 'my-pod', so it deletes that specific pod.

3. Final Answer:

   It removes the pod named 'my-pod' from the cluster. -> Option A

4. Quick Check:

   kubectl delete pod my-pod = Remove pod [OK]

Hint: kubectl delete + resource + name removes that resource [OK]

Common Mistakes:

• Confusing delete with create or update commands
• Deleting without specifying resource name
• Using delete to list resources

2. Which of the following is the correct syntax to delete a deployment named web-app?

easy

A. kubectl destroy deployment web-app

B. kubectl remove deployment web-app

C. kubectl delete web-app deployment

D. kubectl delete deployment web-app

Solution

1. Step 1: Recall kubectl delete syntax

   The correct syntax is kubectl delete <resource> <name>.

2. Step 2: Match the resource and name order

   kubectl delete deployment web-app follows this order correctly: deployment web-app.

3. Final Answer:

   kubectl delete deployment web-app -> Option D

4. Quick Check:

   kubectl delete + resource + name = correct syntax [OK]

Hint: Always use 'kubectl delete resource name' syntax [OK]

Common Mistakes:

• Using wrong verbs like remove or destroy
• Swapping resource and name order
• Omitting resource type

3. What will be the output of the command kubectl delete service my-service if the service my-service exists?

medium

A. Error: service "my-service" not found

B. service "my-service" deleted

C. service "my-service" created

D. No resources found

Solution

1. Step 1: Understand delete command output

   When a resource is successfully deleted, kubectl confirms with a message like resource "name" deleted.

2. Step 2: Match output to existing resource

   Since my-service exists, the output confirms deletion.

3. Final Answer:

   service "my-service" deleted -> Option B

4. Quick Check:

   Deleting existing resource shows 'deleted' message [OK]

Hint: Successful delete shows 'resource "name" deleted' message [OK]

Common Mistakes:

• Expecting creation message on delete
• Confusing 'not found' error when resource exists
• Ignoring confirmation output

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

medium

A. The pod 'my-pod' does not exist in the current namespace.

B. The pod 'my-pod' is already deleted but still shows in the list.

C. You used the wrong command; delete cannot remove pods.

D. The cluster is down and cannot process commands.

Solution

1. Step 1: Analyze the error message

   The error says resource not found, meaning the pod name is not found in the current namespace.

2. Step 2: Check common causes

   Most often, this happens because the pod does not exist or you are in the wrong namespace.

3. Final Answer:

   The pod 'my-pod' does not exist in the current namespace. -> Option A

4. Quick Check:

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

Hint: Check namespace and pod name if resource not found error [OK]

Common Mistakes:

• Assuming delete cannot remove pods
• Ignoring namespace context
• Thinking cluster downtime causes this error

5. You want to delete all pods with the label app=frontend. Which command correctly deletes only those pods?

hard

A. kubectl delete -l app=frontend

B. kubectl delete pods --all

C. kubectl delete pods --selector app=frontend

D. kubectl delete pods app=frontend

Solution

1. Step 1: Understand label selector syntax

   To delete pods by label, use the --selector or -l flag with the label key=value.

2. Step 2: Identify correct command

   kubectl delete pods --selector app=frontend uses --selector app=frontend, which is the correct full flag. kubectl delete -l app=frontend uses -l but misses the resource type pods.

3. Step 3: Confirm other options

   kubectl delete pods --all deletes all pods, not filtered. kubectl delete pods app=frontend is invalid syntax.

4. Final Answer:

   kubectl delete pods --selector app=frontend -> Option C

5. Quick Check:

   Use --selector or -l to filter pods by label [OK]

Hint: Use --selector or -l flag to delete by label [OK]

Common Mistakes:

• Using --all deletes everything, not filtered
• Incorrect syntax without --selector or -l
• Confusing label with resource name