Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses #1005

alfredkrohmer · 2019-04-28T08:45:24Z

Currently, the endpoints of headless services are retrieved
by querying pods using the pod selector of the service.
Instead, we now query for an Endpoints resource with the
same name as the Service object to get the endpoints for the
service. This is needed in order to support the
spec.publishNotReadyPods attribute of a service.

needs documentation and manifest/helm chart update to include permissions to retrieve endpoints resources

alfredkrohmer · 2019-04-28T08:46:06Z

/assign @Raffo

alfredkrohmer · 2019-04-28T12:05:04Z

Note: this will change the default behaviour. Before, the IPs of all Running pods of a headless services were published; now this is only the case when the .spec.publishNotReadyAddresses is set to true.

alfredkrohmer · 2019-06-08T21:05:36Z

@Raffo @njuettner any chance to get this reviewed?

Raffo

@devkid I added one minor comment and I have two requests:

Add a comment to the function extractHeadlessEndpoints to specify what it does. I know there was no comment before but this was IMO bad and we now have a chance to fix it, especially with the changed behaviour.
Write a little sentence that we can add to future release notes on how the behaviour has changed.

Additionally, I'm thinking wether we should add a flag to enable/disable the changed behaviour. I think we could add it and keep it around for a few releases before getting rid of it. WDYT? /cc @linki @njuettner

source/service.go

alfredkrohmer · 2019-08-23T11:15:14Z

@Raffo added an option to restore the old behavior via CLI flag and added a comment for extractHeadlessEndpoints.

alfredkrohmer · 2019-09-17T08:57:22Z

Failing test is fixed now.

Description for release:

Breaking change: Endpoints (pod IPs) for the service source are now retrieved using the Endpoints kubernetes resource instead of using the selector of the service to query for pods and their IPs. The implication is that unready pods will not be picked up anymore by external-dns by default. In order to restore the old behavior and also register IPs of unready pods with DNS:

for a single service, set .spec.publishNotReadyAddresses to true

to restore the old behavior globally, start external-dns with --always-publish-not-ready-addresses

judofyr · 2019-10-30T11:58:30Z

Any update on this?

alfredkrohmer · 2019-11-24T08:18:39Z

Conflict resolved, documentation with inline RBAC permissions updated. I will create a pull request in https://github.com/helm/charts to up the version and add the endpoints resources permissions when there is a new release.

vivekgarg20 · 2019-12-09T12:40:26Z

When is this targeted?

ashley · 2020-01-17T16:23:54Z

Any update on this?

njuettner

added some comments, PTAL.

source/service.go

source/service_test.go

docs/tutorials/alibabacloud.md

… spec.publishNotReadyAddresses Currently, the endpoints of headless services are retrieved by querying pods using the pod selector of the service. Instead, we now query for an Endpoints resource with the same name as the Service object to get the endpoints for the service. This is needed in order to support the spec.publishNotReadyPods attribute of a service.

…ices

njuettner

/lgtm
/cc @Raffo @linki

njuettner · 2020-03-04T13:35:43Z

/approve

k8s-ci-robot · 2020-03-04T13:35:55Z

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as described in kubernetes-sigs/external-dns#1005 now external-dns uses endpoints resource so it needs permissions to do it

as described in kubernetes-sigs/external-dns#1005 now external-dns uses endpoints resource so it needs permissions to do it Signed-off-by: Julián Martínez <julian.martinez@piksel.com>

as described in kubernetes-sigs/external-dns#1005 now external-dns uses endpoints resource so it needs permissions to do it Version bumped to 2.20.4 Signed-off-by: Julián Martínez <julian.martinez@piksel.com>

k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Apr 28, 2019

k8s-ci-robot requested review from njuettner and Raffo April 28, 2019 08:45

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alfredkrohmer mentioned this pull request Apr 28, 2019

Add ready-pods-only annotation #901

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Raffo reviewed Jul 22, 2019

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question: feedback on health check implementation for multi cluster traffic with AWS provider #1203

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nikhita unassigned Raffo Oct 30, 2019

alfredkrohmer force-pushed the feature/headless-services-publishnotreadyaddresses branch from 1535588 to 36f7984 Compare November 24, 2019 08:17

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alfredkrohmer changed the title ~~[RFC] Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses~~ Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses Dec 23, 2019

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alfredkrohmer and others added 4 commits February 18, 2020 19:41

Add CLI option to always publish not ready addresses of headless serv…

6cab35b

…ices

Fix typo

9343fb2

Update documentation to include RBAC permissions for endpoints resources

c91eae9

alfredkrohmer force-pushed the feature/headless-services-publishnotreadyaddresses branch from 0860c23 to 85bf10a Compare February 18, 2020 18:59

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Address review comments

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k8s-ci-robot merged commit a563022 into kubernetes-sigs:master Mar 4, 2020

julian3xl added a commit to julian3xl/charts that referenced this pull request Mar 11, 2020

adding endpoints resource permissions

ae8c183

as described in kubernetes-sigs/external-dns#1005 now external-dns uses endpoints resource so it needs permissions to do it

julian3xl mentioned this pull request Mar 11, 2020

adding endpoints resource permissions helm/charts#21419

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4 tasks

julian3xl mentioned this pull request Mar 11, 2020

[bitnami/external-dns] adding endpoints resource permissions bitnami/charts#2035

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Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses #1005

Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses #1005

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Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses #1005

Headless service: retrieve endpoints via Endpoints resource; evaluate spec.publishNotReadyAddresses #1005

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