add blog for feature LoadBalancerIPMode #43904

RyanAoh · 2023-11-13T11:52:54Z

Blog for new feature LoadBalancerIPMode.

PR link: kubernetes/kubernetes#119937
KEP issue: kubernetes/enhancements#1860

netlify · 2023-11-13T11:52:59Z

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dipesh-rawat · 2023-11-13T13:15:58Z

/sig network

sftim · 2023-11-13T15:58:16Z

Hi.

I'm afraid this PR should target main, not dev-1.29. Even if the announcement is related to Kubernetes v1.29

/hold

krol3 · 2023-11-22T14:53:38Z

Hi @RyanAoh , here Communication Team 1.29, the deadline to the feature blog be ready to review was this Friday, Nov 17th, the proposal publish date will be Dec 18th. cc: @a-mccarthy @kcmartin @James-Quigley

@kubernetes/sig-docs-blog-owners: Blog scheduled: Dec 18th, Publication Order Nro:6

sftim · 2023-11-22T15:41:00Z

content/en/blog/_posts/2023-11-13-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

OK to unhold once the date (check the path and the front matter) matches the assigned date, 2023-12-18.

The date both in the file path and front matter have been updated to 2023-12-18.

content/en/blog/_posts/2023-11-13-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

sftim

Some feedback.

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

sftim · 2023-11-23T15:33:52Z

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

+transmitting packets to the node. In the ipvs mode of kube-proxy, 
+there is a problem that health checks from the load balancer never return as the IP is bound to an interface.


Suggested change

transmitting packets to the node. In the ipvs mode of kube-proxy,

there is a problem that health checks from the load balancer never return as the IP is bound to an interface.

transmitting packets to the node. In the ipvs mode of kube-proxy,

there is a problem that health checks from the load balancer never return (the health checks fail

as the associated listening socket is bound to an interface that the load balancer cannot reach).

The load balancer can reach the listening socket but the reply packets can not out the node. I chane the description here. PTAL.

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

sftim · 2023-11-23T15:36:10Z

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

+This blog introduces `LoadBalancerIPMode`, a new alpha feature in Kubernetes 1.29. 
+It provides a configurable approach to define how service implementations, 
+exemplified in this blog by kube-proxy, 
+handle traffic from pods to the `service.status.loadbalancer.ingress.ip` within the cluster.


Suggested change

This blog introduces `LoadBalancerIPMode`, a new alpha feature in Kubernetes 1.29.

It provides a configurable approach to define how service implementations,

exemplified in this blog by kube-proxy,

handle traffic from pods to the `service.status.loadbalancer.ingress.ip` within the cluster.

This blog introduces a new alpha feature in Kubernetes 1.29.

It provides a configurable approach to define how Service implementations,

exemplified in this blog by kube-proxy,

handle traffic from pods to the Service, within the cluster.

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

sftim · 2023-11-23T15:42:23Z

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

+Given that `EnsureLoadBalancer` returns a `LoadBalancerStatus`, 
+the `ipMode` field can be set by the cloud-controller-manager before returning the status. 
+It is more appropriate to delegate this decision to cloud providers through the cloud-controller-manager 
+rather than relying on end users, who may not be familiar with these technical details.


I'd skip this:

Suggested change

Given that `EnsureLoadBalancer` returns a `LoadBalancerStatus`,

the `ipMode` field can be set by the cloud-controller-manager before returning the status.

It is more appropriate to delegate this decision to cloud providers through the cloud-controller-manager

rather than relying on end users, who may not be familiar with these technical details.

sftim

Thanks for proposing this article.

This PR has missed the deadline for PRs to be ready for review; you should promptly address the pending feedback. This article is at risk of being omitted from post-release comms.

RyanAoh · 2023-12-05T02:16:36Z

@sftim Sorry for not responding promptly. I have made a new commit incorporating your feedback. PTAL, thanks.

sftim

Thanks. Here's some feedback.

The big change to make is to write this article as if Kubernetes v1.29 has been released; we won't publish the article until the release has happened.

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

sftim · 2023-12-05T17:32:16Z

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

+The default value is "VIP", meaning that traffic delivered to the node 
+with the destination set to the load balancer's IP and port will be redirected to the backend service by kube-proxy.
+This preserves the existing behavior of kube-proxy. 
+The "Proxy" value is intended to prevent kube-proxy from binding the Load Balancer IP to the node in both ipvs and iptables modes. 


Suggested change

The "Proxy" value is intended to prevent kube-proxy from binding the Load Balancer IP to the node in both ipvs and iptables modes.

The "Proxy" value is intended to prevent kube-proxy from binding the load balancer's IP address to the node

any mode (iptables, ipvs, nftables).

?

What about Windows behavior? There's another operating mode for kube-proxy and the article as written makes it sound like there isn't.

Oops, the mode for Windows was completely overlooked. Upon checking the code, I found that it hasn't been implemented for Windows at all. This is a mistake. As the code for v1.29.0 has already been frozen. I will patch this after its release.

Windows doesn't have nftables, but there is a kube-proxy mode for Windows: kernelspace

Is there a k/k issue tracked?

I created a new one(kubernetes/kubernetes#122202).

content/en/blog/_posts/2023-12-18-kubernetes-1-29-feature-loadbalancer-ip-mode-alpha.md

Superseded

sftim · 2023-12-06T12:51:58Z

/lgtm
/approve

We can publish this article as it stands.

k8s-ci-robot · 2023-12-06T12:52:07Z

[APPROVALNOTIFIER] This PR is APPROVED

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k8s-ci-robot · 2023-12-06T12:52:08Z

LGTM label has been added.

Git tree hash: afa66e8f70367f93702e35f607382128bc43c36a

sftim · 2023-12-13T18:51:48Z

/hold cancel

k8s-ci-robot added this to the 1.29 milestone Nov 13, 2023

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add blog for feature LoadBalancerIPMode

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pacoxu mentioned this pull request Oct 12, 2024

Make Kubernetes aware of the LoadBalancer behaviour kubernetes/enhancements#1860

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add blog for feature LoadBalancerIPMode #43904

add blog for feature LoadBalancerIPMode #43904

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sftim commented Dec 13, 2023

		transmitting packets to the node. In the ipvs mode of kube-proxy,
		there is a problem that health checks from the load balancer never return as the IP is bound to an interface.

	The "Proxy" value is intended to prevent kube-proxy from binding the Load Balancer IP to the node in both ipvs and iptables modes.
	The "Proxy" value is intended to prevent kube-proxy from binding the load balancer's IP address to the node
	any mode (iptables, ipvs, nftables).

add blog for feature LoadBalancerIPMode #43904

add blog for feature LoadBalancerIPMode #43904

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