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Assume instance exists within eventual-consistency grace period #1024

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Assume instance exists within eventual-consistency grace period #1024

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cartermckinnon
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@cartermckinnon cartermckinnon commented Sep 17, 2024 •
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What type of PR is this?

/kind bug

What this PR does / why we need it:

For a short period of time after an EC2 instance is launched, the ec2:DescribeInstances API may not return details for the instance. When this happens, the node lifecycle controller may delete the Node erroneously, believing the corresponding EC2 instance does not exist.

This PR adds a configurable "grace period" after Node creation, during which the EC2 instance is assumed to exist.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

This is possible in our InstancesV2 implementation, because the controller will pass us the Node: https://github.com/kubernetes/cloud-provider/blob/912e64449ce4cb3645436a768d4a8d5c834652ed/controllers/nodelifecycle/node_lifecycle_controller.go#L253

⚠️ it will not be possible to cherry-pick this back to older release branches that do not implement InstancesV2.

Does this PR introduce a user-facing change?:

NodeEventualConsistencyGracePeriod is a new configuration option to account for propogation delays in EC2 APIs. InstanceExists will now return an error for newly-created nodes until the grace period has elapsed.

@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. 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 17, 2024
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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This issue is currently awaiting triage.

If cloud-provider-aws contributors determine this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

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@k8s-ci-robot k8s-ci-robot added needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Sep 17, 2024
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/assign mmerkes

@cartermckinnon cartermckinnon mentioned this pull request Sep 17, 2024
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kmala
kmala reviewed Sep 19, 2024
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pkg/providers/v1/instances_v2.go Outdated
@@ -44,6 +49,11 @@ func (c *Cloud) getProviderID(ctx context.Context, node *v1.Node) (string, error
// InstanceExists returns true if the instance for the given node exists according to the cloud provider.
// Use the node.name or node.spec.providerID field to find the node in the cloud provider.
func (c *Cloud) InstanceExists(ctx context.Context, node *v1.Node) (bool, error) {
if time.Since(node.CreationTimestamp.Time) < instanceExistsGracePeriod {
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should we check only if the node is not getting deleted by checking if the deletion timestamp exists?

pkg/providers/v1/instances_v2.go Outdated

v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
cloudprovider "k8s.io/cloud-provider"
)

const (
instanceExistsGracePeriod = 2 * time.Minute
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how did we come with this time period?

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Closing this in favor of kubernetes/kubernetes#127424

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Rebooting this.

@cartermckinnon cartermckinnon reopened this Nov 1, 2024
@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Nov 1, 2024
@k8s-ci-robot k8s-ci-robot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Nov 1, 2024
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/retest

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@kmala kmala kmala left review comments

@kishorj kishorj Awaiting requested review from kishorj

@olemarkus olemarkus Awaiting requested review from olemarkus

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@mmerkes mmerkes

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@cartermckinnon @k8s-ci-robot @kmala @mmerkes