Kind: DualStack UX

Created on 22 Jan 2020 · 13Comments · Source: kubernetes-sigs/kind

What would you like to be added:

The more we dig into dual-stack with kubernetes the more doubts it generates, instead of implementing blindly I'd like first to define a good UX from KIND perspective.
At least, we should define the API so it covers most of the use cases.

Why is this needed:

DualStack clusters can have several combinations based on the following parameters:

podSubnets
serviceSubnets
IPv6DualStack featureGate

The first subnet determines the default family of the cluster for dual-stack clusters.

Based on that the cluster can be:

ipv4 only
ipv6 only
ipv4 only with dual-stack enabled
ipv6 only with dual-stack enabled
dual stack and ipv4 default
dual stack and ipv6 default

How should we define the API?

networking:
  ipfamily: ipv4ipv6-dualstack # or whatever we want to call this

kindesign kinexternal kinfeature lifecyclfrozen prioritimportant-longterm

Source

aojea

Most helpful comment

Dual Stack KEP is going to be updated soon, as soon as it's clearly defined the next steps will update the issue

aojea on 7 Apr 2020

👍2 ❤1

All 13 comments

/cc @mauilion @BenTheElder

aojea on 22 Jan 2020

We definitely want to track upstream closely, it seems currently the APIs there need some rethinking..

BenTheElder on 23 Jan 2020

/kind design

BenTheElder on 23 Jan 2020

adding external label until upstream seems settled 🙃

BenTheElder on 10 Feb 2020

Any update on this?

aledbf on 7 Apr 2020

last I checked in upstream was still struggling with this, when upstream is
ready we'll do our best to follow.

On Tue, Apr 7, 2020 at 2:10 PM Manuel Alejandro de Brito Fontes <
[email protected]> wrote:

Any update on this?

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BenTheElder on 7 Apr 2020

👍1

Dual Stack KEP is going to be updated soon, as soon as it's clearly defined the next steps will update the issue

aojea on 7 Apr 2020

👍2 ❤1

https://github.com/kubernetes/enhancements/pull/1679

BenTheElder on 20 Apr 2020

We should PR kubelet upstream to allow setting multiple node IPs natively.

BenTheElder on 20 Apr 2020

👍1

There are two prevailing thoughts (rest is mechanics). Services are single stack by default (if user want to different default, they should use webhooks). Dualstack is set to be preferred or required depending on how the api is expressed. Sorry it is taking time. promise we code fast once we get the kep agreed upon.

khenidak on 11 Jun 2020

❤1

No worries, it will be good to get this right :-)

Thanks for the update!

On Wed, Jun 10, 2020 at 5:30 PM Khaled Henidak (Kal) <
[email protected]> wrote:

There are two prevailing thoughts (rest is mechanics). Services are single
stack by default (if user want to different default, they should use
webhooks). Dualstack is set to be preferred or required depending on how
the api is expressed. Sorry it is taking time. promise we code fast once we
get the kep agreed upon.

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BenTheElder on 11 Jun 2020

@BenTheElder time unfreeze this :-)

khenidak on 4 Nov 2020

I've been reviewing the PR!

On Wed, Nov 4, 2020 at 12:40 PM Khaled Henidak (Kal) <
[email protected]> wrote:

@BenTheElder https://github.com/BenTheElder time unfreeze this :-)

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