blog: introducing kube-scheduler-simulator #47104

sanposhiho · 2024-07-06T07:00:18Z

This PR adds a blog post to introduce sigs/kube-scheduler-simulator.

netlify · 2024-07-06T07:07:43Z

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content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

dipesh-rawat · 2024-07-10T00:11:53Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+title: "Introducing Kube-scheduler-simulator"
+date: 2024-07-xx
+slug: introducing-kube-scheduler-simulator
+canonicalUrl: https://kubernetes.dev/blog/2024/07/xx/introducing-kube-scheduler-simulator/


What's the reason for including the canonicalURL here? Is this blog mirrored from the k8s.dev site? If so, review comments should be added to the original content there.

Sorry, actually I just copied those tags from another blog post.

I saw Kwok's blog post, which I actually copied tags from, have an article in each website.

https://www.kubernetes.dev/blog/2023/03/01/introducing-kwok/

https://kubernetes.io/blog/2023/03/01/introducing-kwok/

Would you recommend creating a blog post in kubernetes.dev too? What's the general difference between those two blog websites?

https://www.kubernetes.dev/blog/ is aimed only at people contributing to Kubernetes
https://www.kubernetes.io/blog/ is aimed at people using to Kubernetes

Who is this article aimed at? I think people might be using this even though they are not Kubernetes contributors - right?

Who is this article aimed at? I think people might be using this even though they are not Kubernetes contributors - right?

Yes, correct. So, here's the place for kubernetes.io blog, right?
Did you suggest making the same post on .dev too? Or, is having it only here fine?

This article is in the right repo. No need to change it.

We never mirror from the general website to the contributor website, so there's also no need to open a PR against the contributor site for this article.

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

k8s-ci-robot · 2024-07-10T14:46:32Z

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sanposhiho · 2024-07-10T14:46:41Z

updated to use figure

Okabe-Junya · 2024-07-13T19:54:29Z

FYI: related issue - #39776

nate-double-u

a copy-edit pass and some nits:

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

sanposhiho · 2024-07-21T06:39:22Z

Addressed the points from @nate-double-u.

Ritikaa96

nit(optional)

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

Ritikaa96 · 2024-07-25T05:31:37Z

The overall content LGTM. Thanks for the contribution @sanposhiho

sanposhiho · 2024-07-26T05:10:22Z

Fixed.

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

sftim

Thanks.

Would you be willing to propose this for https://k8s.dev/blog instead? See https://github.com/kubernetes/contributor-site

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

sanposhiho · 2024-08-02T06:44:36Z

Addressed the suggestions from @sftim @network-charles.

@sftim I actually had a question on that topic -

Would you recommend creating a blog post in kubernetes.dev too? What's the general difference between those two blog websites?
#47104 (comment)

Do you mean, we should move it to kubernetes.dev (and do nothing with .io)? Or we should have it on both websites?
(I actually saw Kwok's post is on both websites.)

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

sftim · 2024-09-09T15:25:17Z

See #47104 (comment)

sftim

Thanks for the PR, and please accept our apologies about the long wait for a review.

I hope this feedback comes over as helpful.

sftim · 2024-11-07T18:35:44Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+The Kubernetes Scheduler is a crucial control plane component that determines which Node a Pod will run on. 
+Thus, anyone utilizing Kubernetes relies on the scheduler.
+
+[Kube-scheduler-simulator](https://sigs.k8s.io/kube-scheduler-simulator) is a simulator for the Kubernetes scheduler, initially developed by Kensei Nakada as part of [Google Summer of Code 2021](https://summerofcode.withgoogle.com/).


Try this:

Suggested change

[Kube-scheduler-simulator](https://sigs.k8s.io/kube-scheduler-simulator) is a simulator for the Kubernetes scheduler, initially developed by Kensei Nakada as part of [Google Summer of Code 2021](https://summerofcode.withgoogle.com/).

The [kube-scheduler-simulator](https://sigs.k8s.io/kube-scheduler-simulator) is a simulator for the Kubernetes scheduler, initially developed by me (Kensei Nakada) as part of [Google Summer of Code 2021](https://summerofcode.withgoogle.com/).

As this is a blog article, you can write in the first person, and you are implicitly writing as you.

sftim · 2024-11-07T18:35:57Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+[Kube-scheduler-simulator](https://sigs.k8s.io/kube-scheduler-simulator) is a simulator for the Kubernetes scheduler, initially developed by Kensei Nakada as part of [Google Summer of Code 2021](https://summerofcode.withgoogle.com/).
+This tool allows users to closely examine the scheduler’s behavior and decisions. 
+
+It is useful for casual users who employ scheduling constraints (e.g., PodAffinity) 


Suggested change

It is useful for casual users who employ scheduling constraints (e.g., PodAffinity)

It is useful for casual users who employ scheduling constraints (e.g., inter-Pod affinity)

sftim · 2024-11-07T18:37:22Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+kind: Pod
+apiVersion: v1
+metadata:
+  annotations:
+    scheduler-simulator/bind-result: '{"DefaultBinder":"success"}'
+    scheduler-simulator/filter-result: >-
+      {"node-jjfg5":{"NodeName":"passed","NodeResourcesFit":"passed","NodeUnschedulable":"passed","TaintToleration":"passed"},"node-mtb5x":{"NodeName":"passed","NodeResourcesFit":"passed","NodeUnschedulable":"passed","TaintToleration":"passed"}}
+    scheduler-simulator/finalscore-result: >-
+      {"node-jjfg5":{"ImageLocality":"0","NodeAffinity":"0","NodeResourcesBalancedAllocation":"52","NodeResourcesFit":"47","TaintToleration":"300","VolumeBinding":"0"},"node-mtb5x":{"ImageLocality":"0","NodeAffinity":"0","NodeResourcesBalancedAllocation":"76","NodeResourcesFit":"73","TaintToleration":"300","VolumeBinding":"0"}}
+    scheduler-simulator/permit-result: '{}'
+    scheduler-simulator/permit-result-timeout: '{}'
+    scheduler-simulator/postfilter-result: '{}'
+    scheduler-simulator/prebind-result: '{"VolumeBinding":"success"}'
+    scheduler-simulator/prefilter-result: '{}'
+    scheduler-simulator/prefilter-result-status: >-
+      {"AzureDiskLimits":"","EBSLimits":"","GCEPDLimits":"","InterPodAffinity":"","NodeAffinity":"","NodePorts":"","NodeResourcesFit":"success","NodeVolumeLimits":"","PodTopologySpread":"","VolumeBinding":"","VolumeRestrictions":"","VolumeZone":""}
+    scheduler-simulator/prescore-result: >-
+      {"InterPodAffinity":"","NodeAffinity":"success","NodeResourcesBalancedAllocation":"success","NodeResourcesFit":"success","PodTopologySpread":"","TaintToleration":"success"}
+    scheduler-simulator/reserve-result: '{"VolumeBinding":"success"}'
+    scheduler-simulator/result-history: >-
+      [{"scheduler-simulator/bind-result":"{\"DefaultBinder\":\"success\"}","scheduler-simulator/filter-result":"{\"node-jjfg5\":{\"NodeName\":\"passed\",\"NodeResourcesFit\":\"passed\",\"NodeUnschedulable\":\"passed\",\"TaintToleration\":\"passed\"},\"node-mtb5x\":{\"NodeName\":\"passed\",\"NodeResourcesFit\":\"passed\",\"NodeUnschedulable\":\"passed\",\"TaintToleration\":\"passed\"}}","scheduler-simulator/finalscore-result":"{\"node-jjfg5\":{\"ImageLocality\":\"0\",\"NodeAffinity\":\"0\",\"NodeResourcesBalancedAllocation\":\"52\",\"NodeResourcesFit\":\"47\",\"TaintToleration\":\"300\",\"VolumeBinding\":\"0\"},\"node-mtb5x\":{\"ImageLocality\":\"0\",\"NodeAffinity\":\"0\",\"NodeResourcesBalancedAllocation\":\"76\",\"NodeResourcesFit\":\"73\",\"TaintToleration\":\"300\",\"VolumeBinding\":\"0\"}}","scheduler-simulator/permit-result":"{}","scheduler-simulator/permit-result-timeout":"{}","scheduler-simulator/postfilter-result":"{}","scheduler-simulator/prebind-result":"{\"VolumeBinding\":\"success\"}","scheduler-simulator/prefilter-result":"{}","scheduler-simulator/prefilter-result-status":"{\"AzureDiskLimits\":\"\",\"EBSLimits\":\"\",\"GCEPDLimits\":\"\",\"InterPodAffinity\":\"\",\"NodeAffinity\":\"\",\"NodePorts\":\"\",\"NodeResourcesFit\":\"success\",\"NodeVolumeLimits\":\"\",\"PodTopologySpread\":\"\",\"VolumeBinding\":\"\",\"VolumeRestrictions\":\"\",\"VolumeZone\":\"\"}","scheduler-simulator/prescore-result":"{\"InterPodAffinity\":\"\",\"NodeAffinity\":\"success\",\"NodeResourcesBalancedAllocation\":\"success\",\"NodeResourcesFit\":\"success\",\"PodTopologySpread\":\"\",\"TaintToleration\":\"success\"}","scheduler-simulator/reserve-result":"{\"VolumeBinding\":\"success\"}","scheduler-simulator/score-result":"{\"node-jjfg5\":{\"ImageLocality\":\"0\",\"NodeAffinity\":\"0\",\"NodeResourcesBalancedAllocation\":\"52\",\"NodeResourcesFit\":\"47\",\"TaintToleration\":\"0\",\"VolumeBinding\":\"0\"},\"node-mtb5x\":{\"ImageLocality\":\"0\",\"NodeAffinity\":\"0\",\"NodeResourcesBalancedAllocation\":\"76\",\"NodeResourcesFit\":\"73\",\"TaintToleration\":\"0\",\"VolumeBinding\":\"0\"}}","scheduler-simulator/selected-node":"node-mtb5x"}]
+    scheduler-simulator/score-result: >-
+      {"node-jjfg5":{"ImageLocality":"0","NodeAffinity":"0","NodeResourcesBalancedAllocation":"52","NodeResourcesFit":"47","TaintToleration":"0","VolumeBinding":"0"},"node-mtb5x":{"ImageLocality":"0","NodeAffinity":"0","NodeResourcesBalancedAllocation":"76","NodeResourcesFit":"73","TaintToleration":"0","VolumeBinding":"0"}}
+    scheduler-simulator/selected-node: node-mtb5x


If using this manifest unchanged, please call out that using the (unregistered) top level domain scheduler-simulator is not a recommended practice for Kubernetes object annotations. It's code from part of the Kubernetes project but it's not following Kubernetes good practice.

If possible, change the actual code to use a more appropriate domain name (eg scheduler-simulator.sigs.k8s.io - which would need registering) before publication. If not feasible to do that, please explain that the domain name in the key is a known bug.

I don't want to tacitly endorse poor practice with an official-looking article.

BTW, you can register annotations with a PR against k/website. We aim for this to be easy; all you need say is that the annotation is used by https://sigs.k8s.io/kube-scheduler-simulator

Thanks, created kubernetes-sigs/kube-scheduler-simulator#386.
We're about to ship a new release, and we can include the fix for it. The fix should be very easy.

Annotations now registered BTW

sftim · 2024-11-07T18:37:40Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+As mentioned earlier, with a limited set of tests, it is impossible to predict every possible scenario in a real-world cluster.
+Typically, you will test the scheduler in a small, development cluster before deploying it to production, hoping that no issues arise.
+
+[The simulator’s importing feature](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/simulator/docs/import-cluster-resources.md)


Suggested change

[The simulator’s importing feature](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/simulator/docs/import-cluster-resources.md)

The simulator's [importing](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/simulator/v0.3.0/simulator/docs/import-cluster-resources.md)

feature

sftim · 2024-11-07T18:37:54Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+
+## What are the use cases?
+
+1. **Cluster users**: Examine if your scheduling constraints (e.g., PodAffinity, PodTopologySpread) work as intended.


Suggested change

1. **Cluster users**: Examine if your scheduling constraints (e.g., PodAffinity, PodTopologySpread) work as intended.

1. **Cluster users**: Examine if your scheduling constraints (e.g., Pod affinity, Pop topology spread) work as intended.

sftim · 2024-11-07T18:38:31Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+2. **Cluster admins**: Assess how your cluster would behave with changes to the scheduler configuration.
+3. **Scheduler plugin developers**: Test your custom scheduler plugins or extenders, use the debuggable scheduler in integration tests or development clusters, and use [the syncing feature](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/simulator/docs/import-cluster-resources.md) for testing within a production-like environment. 


Suggested change

2. **Cluster admins**: Assess how your cluster would behave with changes to the scheduler configuration.

3. **Scheduler plugin developers**: Test your custom scheduler plugins or extenders, use the debuggable scheduler in integration tests or development clusters, and use [the syncing feature](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/simulator/docs/import-cluster-resources.md) for testing within a production-like environment.

1. **Cluster admins**: Assess how your cluster would behave with changes to the scheduler configuration.

1. **Scheduler plugin developers**: Test your custom scheduler plugins or extenders, use the debuggable scheduler in integration tests or development clusters, or use the [syncing](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/simulator/v0.3.0/simulator/docs/import-cluster-resources.md) feature for testing within a production-like environment.

The site renderer does the numbering for you

We avoid linking to trunk-like branches (main, master etc) as the link is unlikely to be long term stable.

sftim · 2024-11-07T18:38:54Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+
+## Getting involved 
+
+The Kube-scheduler-simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!


(nit)

Suggested change

The Kube-scheduler-simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!

The scheduler simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!

sftim · 2024-11-07T18:39:10Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+
+The Kube-scheduler-simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!
+
+Open issues or PRs at [Kube-scheduler-simulator repository](sigs.k8s.io/kube-scheduler-simulator)


(nit)

Suggested change

Open issues or PRs at [Kube-scheduler-simulator repository](sigs.k8s.io/kube-scheduler-simulator)

Open issues or PRs at the [kube-scheduler-simulator repository](https://sigs.k8s.io/kube-scheduler-simulator).

sftim · 2024-11-07T18:39:35Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+
+A big shout out to all [the awesome contributors](https://github.com/kubernetes-sigs/kube-scheduler-simulator/graphs/contributors)!
+
+![contributors](./contributors.png)


This actually doesn't need a figure shortcode, but should have a more descriptive alt attribute.

sftim · 2024-11-07T18:39:46Z

content/en/blog/_posts/2024-07-xx-kube-scheduler-simulator/index.md

+make docker_up
+```
+
+You can then access the simulator's web UI at http://localhost:3000.


(nit)

Suggested change

You can then access the simulator's web UI at http://localhost:3000.

You can then access the simulator's web UI at `http://localhost:3000`.

blog: introducing kube-scheduler-simulator

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k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Jul 6, 2024

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SsomsakTH mentioned this pull request Jul 7, 2024

Scheduling, Preemption and Eviction #47107

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use figure

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Move the top level of our annotations to scheduler-simulator.sigs.k8s.io kubernetes-sigs/kube-scheduler-simulator#386

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	[Kube-scheduler-simulator](https://sigs.k8s.io/kube-scheduler-simulator) is a simulator for the Kubernetes scheduler, initially developed by Kensei Nakada as part of [Google Summer of Code 2021](https://summerofcode.withgoogle.com/).
	The [kube-scheduler-simulator](https://sigs.k8s.io/kube-scheduler-simulator) is a simulator for the Kubernetes scheduler, initially developed by me (Kensei Nakada) as part of [Google Summer of Code 2021](https://summerofcode.withgoogle.com/).

	It is useful for casual users who employ scheduling constraints (e.g., PodAffinity)
	It is useful for casual users who employ scheduling constraints (e.g., inter-Pod affinity)

	[The simulator’s importing feature](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/simulator/docs/import-cluster-resources.md)
	The simulator's [importing](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/simulator/v0.3.0/simulator/docs/import-cluster-resources.md)
	feature


		## What are the use cases?

		1. Cluster users: Examine if your scheduling constraints (e.g., PodAffinity, PodTopologySpread) work as intended.

		2. Cluster admins: Assess how your cluster would behave with changes to the scheduler configuration.
		3. Scheduler plugin developers: Test your custom scheduler plugins or extenders, use the debuggable scheduler in integration tests or development clusters, and use [the syncing feature](https://github.com/kubernetes-sigs/kube-scheduler-simulator/blob/master/simulator/docs/import-cluster-resources.md) for testing within a production-like environment.


		## Getting involved

		The Kube-scheduler-simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!

	The Kube-scheduler-simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!
	The scheduler simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!


		The Kube-scheduler-simulator is developed by Kubernetes SIG Scheduling. Your feedback and contributions are welcome!

		Open issues or PRs at [Kube-scheduler-simulator repository](sigs.k8s.io/kube-scheduler-simulator)

	Open issues or PRs at [Kube-scheduler-simulator repository](sigs.k8s.io/kube-scheduler-simulator)
	Open issues or PRs at the [kube-scheduler-simulator repository](https://sigs.k8s.io/kube-scheduler-simulator).


		A big shout out to all [the awesome contributors](https://github.com/kubernetes-sigs/kube-scheduler-simulator/graphs/contributors)!

		![contributors](./contributors.png)

	You can then access the simulator's web UI at http://localhost:3000.
	You can then access the simulator's web UI at `http://localhost:3000`.

blog: introducing kube-scheduler-simulator #47104

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