Multiple IP configurations on a NIC

[cpressland]

Describe the Enhancement:

Allow for a NIC to have multiple IP configurations

Describe the Need:

We operate Kubernetes Clusters on Azure (not AKS) and need to provision NICs with multiple IP configurations (addresses) for Azure-CNI to work. I am unsure if others would find this useful but I imagine there are other examples where a VM would want multiple IP addresses per NIC.

Current Alternative

Currently we test Kubernetes in Test Kitchen with Weave but deploy to Dev/Staging/Prod with Terraform and Azure-CNI. Our Test Kitchen workflows would benefit from using the same CNI.

Can We Help You Implement This?:

Happy to implement this myself and open a PR assuming:

1. The project feels it would benefit from this feature
2. The Azure API can handle this without having to summon Cthulhu

[marcparadise]

Thanks for opening this @cpressland. I think this would be good functionality to add, and we'd be happy to help you get a PR through; unfortunately I can't answer offhand how well the Azure API would be able to handle it, though I would expect it's a supported use case.