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Kubelet pod eviction proposal#18724

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derekwaynecarr:eviction_policy_spec
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Kubelet pod eviction proposal#18724
k8s-github-robot merged 1 commit intokubernetes:masterfrom
derekwaynecarr:eviction_policy_spec

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@derekwaynecarr derekwaynecarr commented Dec 15, 2015

The following is a proposal for how the kubelet may pro-actively fail a pod in response to local compute resources being starved. The proposal focuses on memory as a first candidate, and defines a greedy strategy for reclaiming starved resources on the node since it seemed easiest to describe for operators versus other options and probably satisfies a broad set of use case environments.

Putting this out now for community feedback, but anticipate some more refinement around how we report eviction configuration back to users in the Node API.

/cc @bgrant0607 @smarterclayton @vishh @dchen1107 @kubernetes/rh-cluster-infra @kubernetes/goog-node

@derekwaynecarr derekwaynecarr mentioned this pull request Dec 15, 2015
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pmorie
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@pmorie pmorie Dec 15, 2015

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...and preventing out of resource situations. ?

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That's taints.

@k8s-github-robot k8s-github-robot added kind/design Categorizes issue or PR as related to design. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Dec 15, 2015
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Can we clarify the higher level requirements or goals explicitly before proposing solutions?

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Sure, will add a section on goals.

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derekwaynecarr commented Dec 16, 2015

@vish - appreciate the initial review. I am out of office remainder of year, but will look to update by Jan 4 with any accumulated review comments. At first glance, I have no major issues with any of the suggestions so I suspect we can get closure first week of January.

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vishh commented Dec 16, 2015

SGTM. Have a great vacation!!

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its

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davidopp commented Dec 16, 2015

I haven't had time to read the proposal, but starvation detection and killing is something we've discussed for rescheduler (#12140). I don't think I have an objection to doing it in the kubelet, but we should give some thought about what should go in the rescheduler and what should go on the kubelet.

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derekwaynecarr commented Apr 26, 2016

Per discussion in sig-node slack:

  1. Add a MemoryPressure node condition when eviction thresholds are met
  2. Clarify that hard eviction thresholds always require grace period = 0
  3. Add ability to define a max soft eviction pod termination grace period, soft eviction thresholds when met will use the min(max soft eviction pod termination grace period, pod grace period)
  4. Runtime interface needs to allow for kill pod to take options to override grace period

@timstclair timstclair mentioned this pull request Apr 26, 2016
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@derekwaynecarr derekwaynecarr mentioned this pull request Apr 27, 2016
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@derekwaynecarr derekwaynecarr force-pushed the eviction_policy_spec branch 4 times, most recently from e887459 to ced5199 Compare April 27, 2016 19:43
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derekwaynecarr commented Apr 27, 2016

@vishh - updates made as requested, PTAL

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@vishh vishh Apr 27, 2016

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This is a longgggg flag name. Can we make it shorter and instead rely on the description to provide more meaning?

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I struggled with naming here.

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derekwaynecarr commented Apr 28, 2016

@vishh - I updated the flag name, and added some clarifications to the text around scheduler behavior, and kill pod error checking. I disagree with the expectation that Guaranteed pods should never be evicted since we do not yet have a foundation in place to support that claim, but I am open to being convinced because Guaranteed pods are not my top concern when thinking about users that will get value out of this feature.

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derekwaynecarr commented Apr 29, 2016

@k8s-bot test this issue #24538

@derekwaynecarr derekwaynecarr added e2e-not-required release-note-none Denotes a PR that doesn't merit a release note. and removed release-note-label-needed labels Apr 29, 2016
@derekwaynecarr derekwaynecarr modified the milestones: v1.3, next-candidate Apr 29, 2016
@vishh vishh added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label May 4, 2016
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k8s-bot commented May 4, 2016

GCE e2e build/test passed for commit 542668c.

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k8s-github-robot commented May 4, 2016

Automatic merge from submit-queue

@k8s-github-robot k8s-github-robot merged commit 9818901 into kubernetes:master May 4, 2016
k8s-github-robot pushed a commit that referenced this pull request May 17, 2016
Merge pull request #21274 from derekwaynecarr/kubelet_eviction
7b4851b 
Automatic merge from submit-queue

out of resource killing (memory)

Adds the core framework for low-resource killing in the kubelet.

Implements support for out of memory killing.

Related:
#18724

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k8s-github-robot pushed a commit that referenced this pull request Jul 10, 2016
Merge pull request #22217 from davidopp/rescheduling
710374b 
Automatic merge from submit-queue

[WIP/RFC] Rescheduling in Kubernetes design proposal

Proposal by @bgrant0607 and @davidopp (and inspired by years of discussion and experience from folks who worked on Borg and Omega).

This doc is a proposal for a set of inter-related concepts related to "rescheduling" -- that is, "moving" an already-running pod to a new node in order to improve where it is running. (Specific concepts discussed are priority, preemption, disruption budget, quota, `/evict` subresource, and rescheduler.)

Feedback on the proposal is very welcome. For now, please stick to comments about the design, not spelling, punctuation, grammar, broken links, etc., so we can keep the doc uncluttered enough to make it easy for folks to comment on the more important things. 

ref/ #22054 #18724 #19080 #12611 #20699 #17393 #12140 #22212

@HaiyangDING @mqliang @derekwaynecarr @kubernetes/sig-scheduling @kubernetes/huawei @timothysc @mml @dchen1107
xingzhou pushed a commit to xingzhou/kubernetes that referenced this pull request Dec 15, 2016
Merge pull request kubernetes#18724 from derekwaynecarr/eviction_poli…
ff894ce 
…cy_spec

Automatic merge from submit-queue

Kubelet pod eviction proposal

The following is a proposal for how the `kubelet` may pro-actively fail a pod in response to local compute resources being starved.  The proposal focuses on memory as a first candidate, and defines a `greedy` strategy for reclaiming starved resources on the node since it seemed easiest to describe for operators versus other options and probably satisfies a broad set of use case environments.

Putting this out now for community feedback, but anticipate some more refinement around how we report eviction configuration back to users in the `Node API`.

/cc @bgrant0607 @smarterclayton @vishh @dchen1107 @kubernetes/rh-cluster-infra @kubernetes/goog-node
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