Add guidance on infrastructure resource names to provider implementation guides

[randomvariable]

User Story

As a user, on some infrastructures when I go to deploy a cluster with names like the following, I experience some form of breakage:

Example names

• default/longnamemorethansixtythreecharacterslong
• default/names.using.dots.in.them
• same cluster name, but in a different namespace ( default/cluster1 businessunit1/cluster1)

Example forms of breakage

• The cluster infrastructure doesn't come up
• The VM doesn't come up
• The VM does come up but doesn't complete bootstrap, and there's complaints from cloud-init about the hostname.

Detailed Description

Provider contracts in https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/book/src/developer/providers/machine-infrastructure.md and https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/book/src/developer/providers/cluster-infrastructure.md should include guidance on how to implement the provider to accept all valid Kubernetes resource names, including techniques like conditional hashing (kubernetes-sigs/cluster-api-provider-aws#1290).

And then after we do that, we should probably circulate this amongst provider implementers so they can check they're not affected, and maybe add appropriate E2Es according to the constraints of their infrastructure provider.

Anything else you would like to add:

A bunch of related issues:

• Windows Support: NetBIOS and Active Directory LDAP SAMAccountName restrictions on Hostname #2217
• cluster with same name under different namespace is provisioned but no infra created #1554
• Nodegroup role name exceeds maximum length cluster-api-provider-aws#2704
• Cluster with reused name in different namespace fails to boot cluster-api-provider-aws#969
• Generate shorter Public IP Names cluster-api-provider-azure#2330

[Miscellaneous information that will assist in solving the issue.]

/kind docs

[k8s-ci-robot]

@randomvariable: The label(s) kind/docs cannot be applied, because the repository doesn't have them.

In response to this:

User Story

As a user, on some infrastructures when I go to deploy a cluster with names like the following, I experience some form of breakage:

Example names

• longnamemorethansixtythreecharacterslong
• names.using.dots.in.them
• same cluster name, but in a different namespace

Example forms of breakage

• The cluster infrastructure doesn't come up
• The VM doesn't come up
• The VM does come up but doesn't complete bootstrap, and there's complaints from cloud-init about the hostname.

Detailed Description

Provider contracts in https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/book/src/developer/providers/machine-infrastructure.md and https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/book/src/developer/providers/cluster-infrastructure.md should include guidance on how to implement the provider to accept all valid Kubernetes resource names, including techniques like conditional hashing (kubernetes-sigs/cluster-api-provider-aws#1290).

And then after we do that, we should probably circulate this amongst provider implementers so they can check they're not affected, and maybe add appropriate E2Es according to the constraints of their infrastructure provider.

Anything else you would like to add:

A bunch of related issues:

• Windows Support: NetBIOS and Active Directory LDAP SAMAccountName restrictions on Hostname #2217
• cluster with same name under different namespace is provisioned but no infra created #1554
• Nodegroup role name exceeds maximum length cluster-api-provider-aws#2704
• Cluster with reused name in different namespace fails to boot cluster-api-provider-aws#969
• Generate shorter Public IP Names cluster-api-provider-azure#2330

[Miscellaneous information that will assist in solving the issue.]

/kind docs

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[randomvariable]

Should add I'm happy to make the docs change.

Does anyone have any other examples of stuff that should be documented?

[randomvariable]

/assign

[fabriziopandini]

/kind documentation
/triage accepted

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/lifecycle stale

[fabriziopandini]

in CAPI we can give some general guidelines, but documentation for each infrastructure should be implemented in each provider.

if we want to fix this properly, one possible approach is to implement additional validation webhooks for CAPI resources in providers, but this seems out of scope of the current request so eventually this + follow up discussions should be moved to a separated issue

/lifecycle frozen
/unassign @randomvariable
/help

[k8s-ci-robot]

@fabriziopandini:
This request has been marked as needing help from a contributor.

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In response to this:

in CAPI we can give some general guidelines, but documentation for each infrastructure should be implemented in each provider.

if we want to fix this properly, one possible approach is to implement additional validation webhooks for CAPI resources in providers, but this seems out of scope of the current request so eventually this + follow up discussions should be moved to a separated issue

/lifecycle frozen
/unassign @randomvariable
/help

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[k8s-triage-robot]

This issue has not been updated in over 1 year, and should be re-triaged.

You can:

• Confirm that this issue is still relevant with /triage accepted (org members only)
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/remove-triage accepted

[fabriziopandini]

/priority backlog

[fabriziopandini]

/triage accepted

Having guidelines like this will be super valuable for the entire Cluster API community.

We should also consider discussing a guideline about how which "root" use to compute infrastructure names (e.g machine or infrastructure machines, see e.g. the issue in #10463)