[install-kubeadm]: Update instructions to disable or tolerate swap

[iholder101]

Description

Addresses kubernetes/kubeadm#2563 (comment).

Updates the instructions regarding swap configuration:

• Outlines the different options more clearly: either disable swap or tolerate it.
• Improves description of how to tolerate swap.

Issue

Closes: kubernetes/kubeadm#2563
Addresses kubernetes/kubeadm#2563 (comment).

Changes overview

[iholder101]

/cc @pacoxu @neolit123

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[neolit123]

is this change specific to v1.32?
if so the change should be for the dev-1.32 branch. not main.

[iholder101]

is this change specific to v1.32?
if so the change should be for the dev-1.32 branch. not main.

Nope, this is relevant from 1.30 and onwards 👍

[sftim]

/sig node

[sftim]

/sig cluster-lifecycle

[sftim]

Overall, I don't think that turning swap off is a prerequisite any more; rather than list that as a prerequisite, let's have a new heading about Linux nodes and swap where we explain how to either check things are right, or advise on what to change.

(I'd reiterate Linux here even though Linux is a prerequisite, because Windows nodes have supported running with swap active for many years).

[pacoxu]

Just find that kernel requirement of kubernetes/kubernetes@2a174d0 is not mentioned in doc.

• I added some in https://kubernetes.io/docs/reference/node/kernel-version-requirements/#requirements-other: For [node system swap](https://kubernetes.io/docs/concepts/architecture/nodes/#swap-memory), tmpfs set to noswap is not supported until kernel 6.3. Could you help to review this and should this be added somewhere else?

[pacoxu]

LGTM

[iholder101]

Just find that kernel requirement of kubernetes/kubernetes@2a174d0 is not mentioned in doc.

• I added some in kubernetes.io/docs/reference/node/kernel-version-requirements#requirements-other: For [node system swap](https://kubernetes.io/docs/concepts/architecture/nodes/#swap-memory), tmpfs set to noswap is not supported until kernel 6.3. Could you help to review this and should this be added somewhere else?

Thanks @pacoxu!

Yeah I've looked at this document, great job!
I'm not sure though if there's anything that needs to be added there. Perhaps I can better describe the implications of not being able to use noswap?

In any case, this is a bit out of scope for this PR :) do you mind discussing this offline or elsewhere?

[pacoxu]

In any case, this is a bit out of scope for this PR :) do you mind discussing this offline or elsewhere?

Agree.

The scope and change of this PR LGTM.

[neolit123]

/lgtm
thanks

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 722a7459fed78e674361dedfc90c3c3fe5b21217

[reylejano]

Swap is not required to be turned off any more. This change makes sense
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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