ipvs

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A lot of Kubernetes users (using IPVS proxy) run on CentOS 7 which is based on Linux 3.10. In the past there have been compatibility issues with older kernel where certain netlink attributes do not exist. For example, for Linux < 3.18 the address family doesn't exist so we had to create some workarounds (https://github.com/moby/ipvs/pull/15 and https://github.com/moby/ipvs/pull/19). The address family compatibility issue would have been caught if we ran tests on CentOS 7.

Looks like we would need to use self-hosted runners for this https://github.com/actions/virtual-environments/issues/45

Yes, for any specific targets we'd need self-hosted runners, otherwise we'll get Azure kernels.