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Do not GC exited containers in running pods #53167

Merged
merged 1 commit into from
Sep 29, 2017
Merged

Do not GC exited containers in running pods #53167

merged 1 commit into from
Sep 29, 2017

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dashpole
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@dashpole dashpole commented Sep 27, 2017 •
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This fixes a regression introduced by #45896, and was identified by #52462.
This bug causes the kubelet to garbage collect exited containers in a running pod.
This manifests in strange and confusing state when viewing the cluster. For example, it can show running pods as having no init container (see #52462), if that container has exited and been removed.

This PR solves this problem by only removing containers and sandboxes from terminated pods.
The important line change is:
if cgc.podDeletionProvider.IsPodDeleted(podUID) || evictNonDeletedPods { --->
if cgc.podStateProvider.IsPodDeleted(podUID) || (cgc.podStateProvider.IsPodTerminated(podUID) && evictTerminatedPods) {

cc @MrHohn @yujuhong @kubernetes/sig-node-bugs

BugFix: Exited containers are not Garbage Collected by the kubelet while the pod is running

@k8s-ci-robot k8s-ci-robot added sig/node Categorizes an issue or PR as relevant to SIG Node. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. kind/bug Categorizes issue or PR as related to a bug. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Sep 27, 2017
@k8s-github-robot k8s-github-robot added do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. release-note Denotes a PR that will be considered when it comes time to generate release notes. and removed do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. labels Sep 27, 2017
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/release-note

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/test pull-kubernetes-unit

yujuhong
yujuhong reviewed Sep 28, 2017
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Looks good with minor nits.

pkg/kubelet/kubelet_pods.go
@@ -820,6 +820,15 @@ func (kl *Kubelet) podIsTerminated(pod *v1.Pod) bool {
return status.Phase == v1.PodFailed || status.Phase == v1.PodSucceeded || (pod.DeletionTimestamp != nil && notRunning(status.ContainerStatuses))
}

// IsPodTerminated returns trus if the pod with the provided UID is in a terminated state ("Failed" or "Succeeded")
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nit: add or if the pod has been deleted.

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done

pkg/kubelet/kuberuntime/kuberuntime_manager.go Outdated
@@ -65,9 +65,10 @@ var (
ErrVersionNotSupported = errors.New("Runtime api version is not supported")
)

// podDeletionProvider can determine if a pod is deleted
type podDeletionProvider interface {
// podStateProvider can determine if a pod is deleted
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s/is deleted/is deleted or terminated

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done

@yujuhong yujuhong added this to the v1.8 milestone Sep 28, 2017
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We should cherry-pick this to 1.8 and 1.7.

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/test pull-kubernetes-e2e-gce-bazel

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/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Sep 28, 2017
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Let's wait for 1.8.1.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dashpole, yujuhong

Associated issue: 45896

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these OWNERS Files:

You can indicate your approval by writing /approve in a comment
You can cancel your approval by writing /approve cancel in a comment

@k8s-github-robot k8s-github-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Sep 28, 2017
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/test pull-kubernetes-e2e-gce-etcd3

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MrHohn commented Sep 29, 2017

/retest

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Automatic merge from submit-queue (batch tested with PRs 44596, 52708, 53163, 53167, 52692). If you want to cherry-pick this change to another branch, please follow the instructions here.

@k8s-github-robot k8s-github-robot merged commit dcaf8e8 into kubernetes:master Sep 29, 2017
@yujuhong yujuhong modified the milestones: v1.8, v1.7 Oct 2, 2017
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yujuhong commented Oct 2, 2017

@dashpole could you patch 1.7 as well? Thanks.

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dashpole commented Oct 2, 2017

@yujuhong can you add the cherrypick-candidate label to this? Thanks

@dashpole dashpole deleted the fix_init_container branch October 2, 2017 16:30
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@dashpole @yujuhong - I'm fine with cherrypicking it to 1.7. However, automated cherrypick is generating a bunch of conflict. So please the cherrypick yourself and I will approve it.

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@dashpole, ping!

This was referenced Oct 11, 2017
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@wojtek-t wojtek-t added the cherry-pick-approved Indicates a cherry-pick PR into a release branch has been approved by the release branch manager. label Oct 12, 2017
k8s-github-robot pushed a commit that referenced this pull request Oct 13, 2017
Merge pull request #53748 from dashpole/automated-cherry-pick-of-#531…
3e734c4 
…67-upstream-release-1.7

Automatic merge from submit-queue.

Automated cherry pick of #53167 upstream release 1.7

Cherrypick of #53167 to the 1.7 branch

/assign @wojtek-t 


```release-note
BugFix: Exited containers are not Garbage Collected by the kubelet while the pod is running
```
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Commit found in the "release-1.7" branch appears to be this PR. Removing the "cherrypick-candidate" label. If this is an error find help to get your PR picked.

@sjenning sjenning mentioned this pull request Oct 16, 2017
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openshift-merge-robot added a commit to openshift/origin that referenced this pull request Oct 20, 2017
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Merge pull request #16896 from sjenning/pick-53167
dbb1013 
Automatic merge from submit-queue (batch tested with PRs 16896, 16908, 16935, 16898, 16090).

UPSTREAM: 53167: Do not GC exited containers in running pods

kubernetes/kubernetes#53167

xref https://bugzilla.redhat.com/show_bug.cgi?id=1486356

I think this might fix the build issues we are having with init container status corruption

Thanks to @aveshagarwal for spotting this getting picked to kube 1.7 👍

@frobware @derekwaynecarr @smarterclayton @vikaslaad
k8s-github-robot pushed a commit that referenced this pull request Oct 31, 2017
Merge pull request #53746 from dashpole/automated-cherry-pick-of-#531…
10846d2 
…67-upstream-release-1.8

Automatic merge from submit-queue.

Automated cherry pick of #53167 upstream release 1.8

cherrypick of #53167

```release-note
BugFix: Exited containers are not Garbage Collected by the kubelet while the pod is running
```
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