Synchronize DNS reconciliation when updating a headless Service

[github-amine-kherbouche]

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What would you like to be added:

A watch mechanism for Headless services' Endpoint updates, ensuring automatic reconciliation of DNS records when scaling operations occur. This enhancement intends to maintain synchronization between the service's DNS entries and the underlying endpoints when scaling the Headless service.

Why is this needed:

Currently, External-DNS generates DNS records upon the creation of a headless Service. However, when scaling deployment/statefulset, updates to the Endpoint resource containing new list of IP addresses don't trigger External-DNS updates. This omission occurs due to the lack of Endpoint event monitoring.

The existing workarounds involve either:

Manually triggering the Service resource update with an annotation. Utilizing a small --interval in External-DNS to enforce recurrent updates. However, this approach has drawbacks:

• Asynchronous updates
• Quick rate limiting by the DNS provider API (such as Route53) due to the number of External-DNS instances.

Consequently, implementing Endpoint event monitoring would streamline the synchronization between scaling operations and DNS updates for Headless services, mitigating the need for manual interventions and/or lowering the update interval

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle rotten
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten

[IliaGe]

We got the same issue, External-DNS is very very slow in terms of updating a headless Service object

[or-he-MA]

Also experiencing the same issue. Currently external-dns takes about ~5 min to update records.

[bakavets-ma]

Hey! We have this issue as well.

[mikeh096]

this would be a great feature, lowering update interval really isn't good enough

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
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Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[github-amine-kherbouche]

/reopen

[k8s-ci-robot]

@github-amine-kherbouche: Reopened this issue.

In response to this:

/reopen

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[github-amine-kherbouche]

any update for this issue? I forget to mention but any updates to the Endpoint resource don't trigger External-DNS updates

[Sagi-MA]

Hey! we are also experiencing the same issue

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[github-brice-messeca]

/reopen

[k8s-ci-robot]

@github-brice-messeca: You can't reopen an issue/PR unless you authored it or you are a collaborator.

In response to this:

/reopen

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[github-amine-kherbouche]

/reopen

[k8s-ci-robot]

@github-amine-kherbouche: Reopened this issue.

In response to this:

/reopen

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.