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[KEP-2400] Node memory swap support (replacement for inactive issue #2400) #4128

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iholder101 opened this issue Jul 19, 2023 · 13 comments
Closed
27 of 35 tasks

[KEP-2400] Node memory swap support (replacement for inactive issue #2400) #4128

iholder101 opened this issue Jul 19, 2023 · 13 comments
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sig/node Categorizes an issue or PR as relevant to SIG Node.

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@iholder101
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iholder101 commented Jul 19, 2023 •
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This is a replacement issue for the outdated, inactive previous issue: #2400.

Enhancement Description

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

/sig node
@k8s-ci-robot k8s-ci-robot added the sig/node Categorizes an issue or PR as relevant to SIG Node. label Jul 19, 2023
@iholder101 iholder101 mentioned this issue Jul 19, 2023
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@iholder101 iholder101 changed the title Node memory swap support per KEP2400 (replacement for inactive issue #2400) [KEP-2400] Node memory swap support (replacement for inactive issue #2400) Jul 19, 2023
@iholder101 iholder101 mentioned this issue Jul 19, 2023
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@iholder101
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/cc @harche @haircommander @rphillips @SergeyKanzhelev @mrunalp

@ffromani
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/cc

@iholder101 iholder101 mentioned this issue Jul 21, 2023
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@sftim
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sftim commented Jul 24, 2023

I've given kubernetes/website#42009 a first pass review. I strongly recommend a security review of the documentation we're providing for this newly beta feature. Lots of clusters run with beta features enabled, and users may need to understand the risks.

@pacoxu
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pacoxu commented Jul 24, 2023 •
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I've given kubernetes/website#42009 a first pass review. I strongly recommend a security review of the documentation we're providing for this newly beta feature. Lots of clusters run with beta features enabled, and users may need to understand the risks.

This beta feature is a little special in that the default FG is off.

NodeSwap: {Default: false, PreRelease: featuregate.Beta},  // 1.28

@sftim
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sftim commented Jul 24, 2023 •
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As soon as it's beta, we can't assume that security-minded folk would disable it out of habit. Instead we really must review the advice to end users. Someone might take the graduation to beta as a signal that it's now safe to enable as documented.

@pacoxu pacoxu mentioned this issue Jul 24, 2023
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@iholder101
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iholder101 commented Jul 26, 2023 •
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As soon as it's beta, we can't assume that security-minded folk would disable it out of habit. Instead we really must review the advice to end users. Someone might take the graduation to beta as a signal that it's now safe to enable as documented.

@sftim Bear in mind that Swap is disabled by default in Beta1, and that we address the security both in the KEP and in the documentation.

However, I agree we need to make sure we warn and guide the users correctly.

Thanks!

@iholder101 iholder101 mentioned this issue Aug 2, 2023
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@SergeyKanzhelev
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can we get back to working on #2400? Duplicating KEP issues is not working very well, lot's of confusion

@iholder101
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can we get back to working on #2400? Duplicating KEP issues is not working very well, lot's of confusion

The problem with #2400 is that I'm not the owner, so can't edit it which leads to outdated confusing information.

IMO we should either close the previous issue and clearly link to this issue as the updated one, or somehow grant me edit access to the previous issue if possible. WDYT?

@pacoxu
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pacoxu commented Sep 18, 2023 •
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The problem with #2400 is that I'm not the owner, so can't edit it which leads to outdated confusing information.

I can do that for you. I think I have already updated recent updates on the Swap feature to the issue description of #2400.

@iholder101
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The problem with #2400 is that I'm not the owner, so can't edit it which leads to outdated confusing information.

I can do that for you. I think I have already updated recent updates on the Swap feature to the issue description of #2400.

Thank you!
Do you mean that you can update the issue? Or also grant me edit rights (which is preferred)?

I see that the previous issue still contains outdated information. If you can't grant me edit rights, can you please copy-paste the description from this issue to the original one? Here's the description with all of the markdown tags:

This is a replacement issue for the outdated, inactive previous issue: https://github.com/kubernetes/enhancements/issues/2400.

# Enhancement Description
* One-line enhancement description (can be used as a release note): Kubernetes nodes support swap memory.
* Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2400-node-swap
* Discussion Link: https://docs.google.com/document/d/1CZtRtC8W8FwW_VWQLKP9DW_2H-hcLBcH9KBbukie67M/edit# [Kubelet/Kubernetes should work with Swap Enabled kubernetes#53533](https://github.com/kubernetes/kubernetes/issues/53533)
* Primary contact (assignee): @iholder101
* Responsible SIGs: Node
* Enhancement target (which target equals to which milestone):
  * Alpha release target (x.y): 1.22
  * Beta release target (x.y): 1.28
  * Stable release target (x.y):
* [x]  Alpha
  * [x]  KEP (`k/enhancements`) update PR(s): https://github.com/kubernetes/enhancements/pull/2602
  * [x]  Code (`k/k`) update PR(s):
    * [x]  CI/test infra changes: https://github.com/kubernetes/test-infra/pull/22602 https://github.com/kubernetes/test-infra/pull/22809
    * [x]  CRI and kubelet changes https://github.com/kubernetes/kubernetes/pull/102823
  * [x]  Docs (`k/website`) update PR(s): https://github.com/kubernetes/website/pull/28838
* [ ]  Beta1
  * [x]  KEP (`k/enhancements`) update PR(s):
    * [x]  https://github.com/kubernetes/enhancements/pull/2858
    * [x]  https://github.com/kubernetes/enhancements/pull/3957
  * [x]  Issues and Code (`k/k`) update PR(s):
    * Support cgroups v2 with auto-calculated LimitedSwap for Burstable QoS pods
      * [x]  https://github.com/kubernetes/kubernetes/issues/119427
      * [x]  https://github.com/kubernetes/kubernetes/issues/119428
      * [x]  https://github.com/kubernetes/kubernetes/pull/118764
    * [x] Add Swap stats to `/stats/summary` and `/metrics/resource`
      * [x]  https://github.com/kubernetes/kubernetes/issues/119425
      * [x]  https://github.com/kubernetes/kubernetes/pull/118865
    * [x] Determine a set of metrics for measuring node performance with swap enabled
      * [x]  https://github.com/kubernetes/kubernetes/issues/119424
      * [x]  https://github.com/kubernetes/kubernetes/pull/118865
      * [x]  https://github.com/google/cadvisor/pull/3339
    * [x] Improve test coverage and make sure tests are green
      * [x]  https://github.com/kubernetes/kubernetes/issues/119430
      * [x]  https://github.com/kubernetes/kubernetes/pull/118764
  * [ ]  Docs (`k/website`) update(s):
    * [ ] https://github.com/kubernetes/website/pull/42009
    * [X] https://github.com/kubernetes/website/pull/42167
  * [x] Misc
    * [x] https://github.com/google/cadvisor/pull/3293
    * [x] https://github.com/kubernetes/kubernetes/pull/119225
  * Archive / Outdated
* [ ]  Beta2
* [ ]  Future (related PRs, can be assigned to a specific track later)
  * Add the ability to set a system-reserved quantity of swap on a node
    * [ ]  https://github.com/kubernetes/kubernetes/issues/105019
    * [ ]  https://github.com/kubernetes/kubernetes/pull/105271
  * [ ] https://github.com/kubernetes/kubernetes/pull/119327

_Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently._

/sig node

@pacoxu
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pacoxu commented Sep 18, 2023 •
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Updated.

Sorry, I have no permission to grant you the permission. I will try to keep up with your steps and follow up on the feature. When there are any updates needed, you can ping me on GitHub or Slack.

@iholder101
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Too bad Github doesn't have an issue-ownership-transfer feature :D
Thank you @pacoxu!

/close

@k8s-ci-robot
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@iholder101: Closing this issue.

In response to this:

Too bad Github doesn't have an issue-ownership-transfer feature :D
Thank you @pacoxu!

/close

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