Feature Overview (aka. Goal Summary)  

Support for dual-stack SNO deployments that allow automatic switching between IPv4 and IPv6 during failover

Goals (aka. expected user outcomes)

The observable functionality that the user now has as a result of receiving this feature. Include the anticipated primary user type/persona and which existing features, if any, will be expanded. Complete during New status.

Currently, changing the primary address family (e.g., from IPv6 to IPv4) is a fundamental Kubernetes limitation and not easily achievable with scripts

When using dual stack, the primary IP family is what workloads assume connectivity to, and losing connectivity to that family can prevent external reachability for pods initiating traffic should be considered.

Differentiating between scenarios where the backup IP is pre-existing (which should be fine) and where a new backup IP needs to be provisioned and switched to, which remains a problem . This needs validation and testing to see if IP can indeed be replaced and how and who can replace this when the connection tot he cluster is lost.

Quicker dual-stack solution, involving installing with an IPv4 as primary and IPv6 as secondary simplifies failover issues with one loses IPv6 connections.  

Requirements (aka. Acceptance Criteria):

A list of specific needs or objectives that a feature must deliver in order to be considered complete.  Be sure to include nonfunctional requirements such as security, reliability, performance, maintainability, scalability, usability, etc.  Initial completion during Refinement status.

<enter general Feature acceptance here>

Anyone reviewing this Feature needs to know which deployment configurations that the Feature will apply to (or not) once it's been completed.  Describe specific needs (or indicate N/A) for each of the following deployment scenarios. For specific configurations that are out-of-scope for a given release, ensure you provide the OCPSTRAT (for the future to be supported configuration) as well.

Use Cases (Optional):

Include use case diagrams, main success scenarios, alternative flow scenarios.  Initial completion during Refinement status.

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Questions to Answer (Optional):

Include a list of refinement / architectural questions that may need to be answered before coding can begin.  Initial completion during Refinement status.

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Out of Scope

High-level list of items that are out of scope.  Initial completion during Refinement status.

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Background

Provide any additional context is needed to frame the feature.  Initial completion during Refinement status.

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Customer Considerations

Provide any additional customer-specific considerations that must be made when designing and delivering the Feature.  Initial completion during Refinement status.

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Documentation Considerations

Provide information that needs to be considered and planned so that documentation will meet customer needs.  If the feature extends existing functionality, provide a link to its current documentation. Initial completion during Refinement status.

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Interoperability Considerations

Which other projects, including ROSA/OSD/ARO, and versions in our portfolio does this feature impact?  What interoperability test scenarios should be factored by the layered products?  Initial completion during Refinement status.

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