AKS: Unable to create cluster with underscore in name

[cpinjani]

Setup

• Rancher version: v2.7-67422772955d5830b237fe84dbf1a26d266b55c1-head
• Browser type & version: Chrome Latest

Describe the bug AKS: Unable to create cluster with underscore in name. The same is valid as per AKS Docs

To Reproduce Create AKS cluster via Rancher UI with "_" in name eg. rancher_test

Expected Result User must be able to create AKS cluster with underscore in name as it is supported

Screenshots

cc: @rancher/highlander

[cpinjani]

Validated on build: v2.9-6d87a11ea46b7571646d7c3d7af704584c39fd62-head Seems not fixed since unable to create cluster with underscore in name.

[yonasberhe23]

@mantis-toboggan-md I'm getting an error when the cluster name has an underscore. can you take a look please?

[mantis-toboggan-md]

That error is coming from the backend, it looks like the norman api has different validation for cluster names than the azure portal. I'm not sure if thats intentional - could anyone from @rancher/highlander weigh in?

[valaparthvi]

I can reproduce this issue as well on Rancher (v2.9-d2fa8a7d6116c48a814ee7983af522d614461e49-head), Dashboard (master 526f329). cc: @mjura @yiannistri

[gaktive]

@kkaempf this may be backend related, can you have someone take a look?

[gaktive]

At this time, this may be a release blocker.

[yiannistri]

Sharing my findings regarding this issue:

• The error seems to originate from a k8s validation library that checks whether a label is valid. In this case, it has been repurposed to check the cluster name (unsure why).
• The Rancher API appears to perform this check when a new cluster is being created regardless of the cluster driver being used. So the reported issue is not specific to AKS clusters but also affects EKS and RKE2 clusters too.
• In fact, we have UI validation that prevents underscores when creating an RKE2 cluster (as shown in the screenshot below).

Given that this issue is not specific to AKS (or any other hosted provider) and the fact that our UI prevents users from using underscores in other parts of the app, I'm not sure how we should proceed. It feels like changing this logic would affect cluster creation in general (so not exactly a quick fix before a major release) and it would make the app somewhat inconsistent in terms of cluster naming rules.

cc @kkaempf @gaktive @mjura for input

[gaktive]

@nwmac based on this library and where we also don't permit underscores, it sounds like we can't easily make this work with the time we have left. Since this has been around for a while, should we tackle this later or what should we try in the current timeframe?

[nwmac]

@gaktive I don't think we allow the underscore because Rancher uses that name to name the cluster resource - this is a k8s object and I don't believe _ is valid for that. So, AWS may allow it, but because of how Rancher works, we don't.

This would require backend changes that may not be straight forward.

Thus, we should not do this for 2.9.0 and should hand over to the backend team to own.

[nwmac]

@cpinjani Does this work with 2.8? (We migrated the UI from the old Ember to Vue in 2.9, so want to check if this is a side-effect of that).

[cpinjani]

@nwmac Its a legacy issue initially reported on v2.7 and reproducible across Rancher versions.

[nwmac]

@cpinjani Thank you

@gaktive I am going to remove the release-blocker label - since this is not a regression, this is a not a release blocker.

[gaktive]

I'll push this to 2.10.0 then. I'll put a release note label here though I think we may have this known issue about _ in names documented somewhere already. @btat can keep me honest.