Allow for hostnames other than private dns about cloud-provider-aws

[olemarkus]

I think we can close this one now. See https://cloud-provider-aws.sigs.k8s.io/prerequisites/

[edgan]

I implemented this on my own. The change is very minimal. The only thing what would probably change in an official patch would be the tag name.

http://cygnusx-1.org/kubernetes-aws-hostnames.patch

[andrewsykim]

/reopen

[andrewsykim]

@justinsb @nckturner @M00nF1sh can you comment on if the out-of-tree provider will allow for hostnames aside from private DNS? I assumption is yes because we will be working with whatever hostname the kubelet (without --cloud-provider=aws) has already.

[nckturner]

I think we should allow for different hostnames--we have the same assumption in EKS, so I think the out of tree cloud provider would be a perfect place to add the flexibility, and we should remove those assumptions from EKS by the time we migrate to out-of-tree.

[schlitzered]

any news here, on an official solution?

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[olfway]

/remove-lifecycle stale

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[olfway]

/reopen

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[nckturner]

/reopen

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@nckturner: Reopened this issue.

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/reopen

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/close

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[AnthonyPoschen]

any chance of this being worked on?

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@andrewsykim: Reopened this issue.

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/close

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@k8s-triage-robot: Closing this issue.

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[wongma7]

/reopen

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[wongma7]

/remove-lifecycle rotten

[nckturner]

/triage accepted

[wongma7]

as of 1.23 alpha node names being equal to instance id is allowed by patch #286 which changed internal implementation of
func (c *Cloud) InstanceID(ctx context.Context, nodeName types.NodeName) (string, error) {

Basically with in-tree cloudprovider the node name was restricted to privateDNS because that is what CurrentNodeName returned.

With out-of-tree cloudprovider the node name is restricted by what InstanceID can derive instance id from. So we could build on the work of #286 to accept stuff like if the node name simply has prefix instance id or such depending on what people want.

[wongma7]

however the assumption that private dns == node name is deeply embedded in the v1 impelmentation (e.g. we found bug in route controller where breaking this assumption leads to spammed aws api requests which is obviously a bug ) #319 so it's not trivial to extend support for more node names, it needs lots of testing.

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[olfway]

/remove-lifecycle stale

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/close not-planned

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

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