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Kubernetes CI Policy: merge-blocking jobs must run in dedicated cluster #18550

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spiffxp opened this issue Jul 30, 2020 · 13 comments · Fixed by #20416
Closed
21 of 22 tasks

Kubernetes CI Policy: merge-blocking jobs must run in dedicated cluster #18550

spiffxp opened this issue Jul 30, 2020 · 13 comments · Fixed by #20416
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area/jobs area/release-eng Issues or PRs related to the Release Engineering subproject sig/release Categorizes an issue or PR as relevant to SIG Release.

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@spiffxp
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spiffxp commented Jul 30, 2020 •
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Part of #18551

Why this is necessary:

  • we believe declaring Guaranteed Pod QOS jobs may not be defended against Best Effort or Burstable Pods hogging all resources on the same node
  • a cluster that only has Guaranteed pods is far more likely to respect resource requirements

Decisions to make:

  • For all of the jobs being migrated to k8s-infra-prow-build, we're going to use the same node pool as everything else. To pin to a dedicated node pool will require much more boilerplate (or possibly augmenting prow's preset feature). If after migrating everything we find we do need a dedicated nodepool, then we'll pay the added cost.
  • Jobs that can't be migrated quickly will remain in the default google.com-owned k8s-prow-builds cluster until such time as they can be migrated. They will continue to compete for resources until they have migrated, and we will be reliant on test-infra-oncall to provide any visibility into the behavior of such jobs.

Jobs to migrate:

TODO:
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@spiffxp spiffxp mentioned this issue Aug 1, 2020
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spiffxp commented Aug 1, 2020

sig testing
/sig release
/wg k8s-infra
/area release-eng
/area jobs

@k8s-ci-robot k8s-ci-robot added sig/release Categorizes an issue or PR as relevant to SIG Release. wg/k8s-infra area/release-eng Issues or PRs related to the Release Engineering subproject area/jobs labels Aug 1, 2020
@spiffxp spiffxp mentioned this issue Aug 4, 2020
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@spiffxp
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spiffxp commented Aug 13, 2020

I'm trialing migration of three different kinds of jobs to get a feel for whether the rest can be migrated over in a similar fashion, or whether more preparation is needed:

Based on how these go I'll break out other TODO's into help wanted issues

@helenfeng737
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/cc

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@spiffxp
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spiffxp commented Aug 14, 2020

OK, I've broken out everything I think can be done right now, tagged as help-wanted, and added to the CI Policy Improvements - Next Priority column

The remaining TODO's need some unblocking work

@spiffxp
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spiffxp commented Aug 21, 2020

We may need to roll some jobs back or adjust some limits. Started bumping into a quota we're having difficulty raising kubernetes/k8s.io#1132 (comment)

@spiffxp
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spiffxp commented Aug 25, 2020

IP quota has been bumped to a reasonable level. I'm now less concerned about trying to mitigate or undo migration of the jobs that have been migrated thus far.

@spiffxp
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spiffxp commented Aug 28, 2020

kubernetes/k8s.io#1187 trying to improve cluster's I/O capacity, I'm wary of moving over pull-kubernetes-bazel jobs until this is addressed

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spiffxp commented Sep 10, 2020

kubernetes/k8s.io#1231 we're starting to hit the max nodepool size of 90 so I'd like to increase to 150

@spiffxp spiffxp mentioned this issue Sep 10, 2020
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@lasomethingsomething
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Heya: +1 if we can get this updated with the checkbox marked for #18854

@spiffxp spiffxp mentioned this issue Oct 7, 2020
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@lasomethingsomething
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lasomethingsomething commented Oct 12, 2020 •
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In the write-up, under

TODO: determine gcp project / boskos requirements, provision

This item is now closed:
kubernetes/k8s.io#851 - scalability-project

Is that TODO now complete?

Also wondering if the other items in the TODO section:

TODO: migrate jobs that require special projects
TODO: declare we are finished (or done enough to move on)

need an update?

@ameukam ameukam mentioned this issue Oct 29, 2020
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spiffxp commented Nov 5, 2020

@LappleApple #19073 is the last remaining issue

ameukam added a commit to ameukam/test-infra that referenced this issue Nov 5, 2020
@ameukam
Migrate pull-kubernetes-bazel-build to k8s-infra-prow-build
8f96c29 
Part of kubernetes#19073
Ref: kubernetes#18550

Signed-off-by: Arnaud Meukam <ameukam@gmail.com>
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spiffxp commented Jan 8, 2021

Closed out the last remaining issue #19073 (comment)

All merge-blocking jobs run in k8s-infra-prow-build. Last thing to do is switch job config tests to fail instead of warn to prevent future violations of this policy.

@spiffxp spiffxp mentioned this issue Jan 8, 2021
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spiffxp commented Jan 8, 2021

Opened #20416 to switch job config tests

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jobs: kubernetes merge-blocking jobs must run in k8s-infra-prow-build spiffxp/test-infra
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@spiffxp @lasomethingsomething @helenfeng737 @k8s-ci-robot