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kubernetes-retired / cluster-api-provider-nested

Cluster API Provider for Nested Clusters
Apache License 2.0
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🐛 namespace names should valid RFC 1123 DNS labels #340

Closed wondywang closed 1 year ago

wondywang commented 1 year ago

What type of PR is this? /kind bug

What this PR does / why we need it: As mentioned here, https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/#namespaces-and-dns, all namespace names must be valid RFC 1123 DNS labels.

wondywang commented 1 year ago

@christopherhein PTAL, thanks.

Fei-Guo commented 1 year ago

Out of curiosity, what is the difference between these two values?

wondywang commented 1 year ago

Out of curiosity, what is the difference between these two values?

// DNS1123SubdomainMaxLength is a subdomain's max length in DNS (RFC 1123)
const DNS1123SubdomainMaxLength int = 253

// DNS1123LabelMaxLength is a label's max length in DNS (RFC 1123)
const DNS1123LabelMaxLength int = 63

And the maximum length supported by namespace is 63 characters.

Fei-Guo commented 1 year ago

Is DNS1123SubdomainMaxLength changed? I clearly remember this should be 64, otherwise the code is wrong.

wondywang commented 1 year ago

I'm not sure about this. But I found the latest definition, it is indeed the case. Because I recently discovered that there was too long namespace that was not synchronized, and then I found the reason here.

https://github.com/kubernetes/apimachinery/blob/master/pkg/util/validation/validation.go#L209

Fei-Guo commented 1 year ago

Did you change your kubernetes version locally?

wondywang commented 1 year ago

Did you change your kubernetes version locally?

no. and I checked the historical version of k8s.io/apimachinery, it should always be that value.

Fei-Guo commented 1 year ago

cool. Thanks for fixing the long-term bug then.

/lgtm /approve

k8s-ci-robot commented 1 year ago

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Fei-Guo, wondywang

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