Linux Foundation CKA Exam - Topic 3 Question 73 Discussion

Actual exam question for Linux Foundation's CKA exam

Question #: 73
Topic #: 3

[All CKA Questions]

Score: 7%

Task

Given an existing Kubernetes cluster running version 1.20.0, upgrade all of the Kubernetes control plane and node components on the master node only to version 1.20.1.

Be sure to drain the master node before upgrading it and uncordon it after the upgrade.

You are also expected to upgrade kubelet and kubectl on the master node.

AExplanation:
SOLUTION:
[student@node-1] > ssh ek8s
kubectl cordon k8s-master
kubectl drain k8s-master --delete-local-data --ignore-daemonsets --force
apt-get install kubeadm=1.20.1-00 kubelet=1.20.1-00 kubectl=1.20.1-00 --disableexcludes=kubernetes
kubeadm upgrade apply 1.20.1 --etcd-upgrade=false
systemctl daemon-reload
systemctl restart kubelet
kubectl uncordon k8s-master

Show Suggested Answer

Suggested Answer: A

by Fatima at Sep 13, 2024, 07:39 PM

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Stefania

3 months ago

Is it really safe to skip the etcd upgrade?

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Eleonora

3 months ago

This is straightforward, nice step-by-step!

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Loise

4 months ago

Wait, why are we upgrading just the master node?

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Kaitlyn

4 months ago

Totally agree, but don't forget to back up first!

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Ruthann

4 months ago

Just a minor version upgrade, easy peasy!

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Carlee

4 months ago

I recall that we should use `kubectl cordon` before draining, but I’m not clear if we need to include the `--force` flag when draining.

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Olive

4 months ago

I’m a bit confused about the order of commands. Do we really need to restart kubelet after the upgrade, or can we just uncordon it right away?

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Lore

5 months ago

This question feels similar to the practice one where we had to upgrade the control plane. I think we also had to specify the version for kubelet and kubectl, right?

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Claudio

5 months ago

I think I remember that we need to drain the master node first, but I'm not entirely sure about the exact command syntax for draining.

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Mireya

5 months ago

I want to make sure I understand this correctly before I start. Do I need to do anything special with the etcd data during the upgrade? And should I be concerned about any downtime or service disruptions while I'm upgrading the master node?

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Ruthann

5 months ago

This is a common task for Kubernetes upgrades. The key is to focus on the master node first, as that's where the control plane components are running. Draining the node, upgrading kubeadm, kubelet, and kubectl, and then uncordoning the node should do the trick.

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Felicidad

5 months ago

Hmm, I'm a bit confused about the steps here. Do I need to upgrade the worker nodes as well, or just the master? And what's the difference between kubeadm upgrade and the package upgrades?

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Carol

5 months ago

Looks straightforward, I'll start by cordoning the master node, then drain it to ensure no pods are running. Next, I'll upgrade the control plane components using kubeadm, and finally, upgrade the kubelet and kubectl packages.

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Ty

5 months ago

This seems straightforward. I think the \copy command with the DELIMITER option is the way to go.

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Alaine

10 months ago

Upgrading the kubelet and kubectl on the master node is an important step that I'm glad they included. Can't have a mismatch between the control plane and the client tools!

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Sylvie

10 months ago

The instructions cover all the bases, from upgrading the control plane to the node components. I'm confident this will get the job done without any issues.

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Nan

10 months ago

Haha, 'apt-get install' on a Kubernetes cluster? That's a bold move, Cotton! Let's see if it pays off.

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Blondell

9 months ago

User 3: Well, hopefully it works out for them in the end.

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Daniel

9 months ago

User 2: Daniel, I think they are following a specific solution guide for the upgrade process.

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Adelle

9 months ago

User 1: I know, right? 'apt-get install' on a Kubernetes cluster sounds risky.

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Julianna

11 months ago

Looks good, but I'm a bit concerned about the `--force` flag in the `drain` command. Is that really necessary? Wouldn't it be better to gracefully stop the pods on the master node?

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Nancey

10 months ago

You're right, but it's always good to consider graceful termination of pods if possible.

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Dallas

10 months ago

I think using the --force flag ensures that all pods are evicted from the node quickly.

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Casandra

11 months ago

Draining the master node before upgrading is a crucial step to ensure the cluster's availability during the update process. The instructions are clear and comprehensive.

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