kubectl delete for removal in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the command kubectl delete pod my-pod do?

It removes the pod named my-pod from the Kubernetes cluster, stopping and deleting it.

beginner

How do you delete a deployment named web-app using kubectl?

Use the command kubectl delete deployment web-app to remove the deployment and all its pods.

beginner

What happens if you run kubectl delete service my-service?

The service named my-service is removed, so it no longer routes traffic to pods.

intermediate

How can you delete multiple resources at once with kubectl?

You can list multiple resources in one command, like kubectl delete pod pod1 pod2, to remove both pods at once.

advanced

What does the flag --force do when used with kubectl delete?

It forces immediate deletion of a resource, even if it might cause issues, bypassing graceful shutdown.

What is the correct command to delete a pod named 'test-pod'?

A kubectl erase pod test-pod

B kubectl remove pod test-pod

C kubectl stop pod test-pod

D kubectl delete pod test-pod

The correct command to delete a pod is 'kubectl delete pod '.

Which kubectl command deletes a deployment named 'frontend'?

A kubectl stop deployment frontend

B kubectl remove deployment frontend

C kubectl delete deployment frontend

D kubectl erase deployment frontend

Use 'kubectl delete deployment ' to delete a deployment.

What does the --force flag do with kubectl delete?

A Forces immediate deletion without waiting for graceful shutdown

B Prevents deletion of the resource

C Deletes only if resource is not in use

D Schedules deletion for later

The '--force' flag forces immediate deletion, skipping graceful shutdown.

How can you delete multiple pods named pod1 and pod2 in one command?

A kubectl delete pod pod1 pod2

B kubectl delete pods pod1,pod2

C kubectl remove pod pod1 pod2

D kubectl delete pod pod1; pod2

Listing multiple pod names separated by space after 'kubectl delete pod' deletes them all.

What happens if you delete a service in Kubernetes?

A Pods are deleted automatically

B The service stops routing traffic to pods

C The cluster shuts down

D Nothing happens

Deleting a service removes its routing, but pods remain running.

Explain how to delete a Kubernetes pod and what happens after deletion.

Think about the command and the pod's state after deletion.

Describe the use and effect of the --force flag with kubectl delete.

Consider why you might want to force delete a resource.

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