Linux Foundation Exam CKS Topic 4 Question 77 Discussion

Actual exam question for Linux Foundation's CKS exam

Question #: 77
Topic #: 4

[All CKS Questions]

Create a new ServiceAccount named backend-sa in the existing namespace default, which has the capability to list the pods inside the namespace default.

Create a new Pod named backend-pod in the namespace default, mount the newly created sa backend-sa to the pod, and Verify that the pod is able to list pods.

Ensure that the Pod is running.

AExplanation:
A service account provides an identity for processes that run in a Pod.
When you (a human) access the cluster (for example, usingkubectl), you are authenticated by the apiserver as a particular User Account (currently this is usuallyadmin, unless your cluster administrator has customized your cluster). Processes in containers inside pods can also contact the apiserver. When they do, they are authenticated as a particular Service Account (for example,default).
When you create a pod, if you do not specify a service account, it is automatically assigned thedefaultservice account in the same namespace. If you get the raw json or yaml for a pod you have created (for example,kubectl get pods/ -o yaml), you can see thespec.serviceAccountNamefield has beenautomatically set.
You can access the API from inside a pod using automatically mounted service account credentials, as described inAccessing the Cluster. The API permissions of the service account depend on theauthorization plugin and policyin use.
In version 1.6+, you can opt out of automounting API credentials for a service account by settingautomountServiceAccountToken: falseon the service account:
apiVersion: v1
kind: ServiceAccount
metadata:
name: build-robot
automountServiceAccountToken: false
...
In version 1.6+, you can also opt out of automounting API credentials for a particular pod:
apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
serviceAccountName: build-robot
automountServiceAccountToken: false
...
The pod spec takes precedence over the service account if both specify aautomountServiceAccountTokenvalue.

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Suggested Answer: A

by Mabelle at Apr 03, 2025, 11:40 AM

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Glenna

2 months ago

This is a pretty straightforward question, but I can imagine it might trip up some people if they're not familiar with how ServiceAccounts work. Good thing we've got this explanation to guide us!

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Leoma

2 months ago

Wait, do we need to create any specific permissions or Role for the backend-sa ServiceAccount? I don't want to forget that step and end up with a non-working solution.

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Billy

20 days ago

As long as you create the ServiceAccount and mount it to the Pod, you should be good to go without any extra steps.

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Sena

24 days ago

The ServiceAccount will inherit the permissions of the default service account in the same namespace.

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Vilma

1 months ago

Just create the ServiceAccount and mount it to the Pod, it should work fine without any additional permissions.

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Kyoko

1 months ago

No, you don't need to create any specific permissions or Role for the backend-sa ServiceAccount. It will automatically have the default permissions.

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Alethea

2 months ago

Haha, I bet the exam question is going to be something like, 'Which command do you use to list the Pods in the default namespace?' I'm already prepared for that one!

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Leota

1 months ago

Kayleigh: You use the kubectl command to list the Pods in the default namespace.

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Kayleigh

1 months ago

User 2: What is it?

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Jina

2 months ago

User 1: I think I know the answer to that question.

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Val

3 months ago

We should make sure that the Pod is able to list pods by mounting the backend-sa to the pod.

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Leontine

3 months ago

Sounds good to me. As long as we follow the instructions carefully, we should be able to get this done without any issues.

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Samira

1 months ago

User 4: Finally, verify that the pod is able to list pods and ensure that it is running.

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Kattie

1 months ago

User 3: Next, we need to create a new Pod named backend-pod and mount the backend-sa to it.

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Joanna

1 months ago

User 2: Make sure to grant it the capability to list pods in the default namespace.

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Sharika

2 months ago

User 1: Let's create a new ServiceAccount named backend-sa in the default namespace.

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Eva

3 months ago

Yes, and we also need to create a new Pod named backend-pod in the default namespace.

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Val

3 months ago

I think we need to create a new ServiceAccount named backend-sa in the default namespace.

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Norah

3 months ago

Okay, let's see if I understand this correctly. We need to create a new ServiceAccount named backend-sa in the default namespace, and then mount that ServiceAccount to a new Pod named backend-pod. The goal is to verify that the Pod can list the Pods in the default namespace.

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