Dual-Stack Hosted Cluster: IPv6 should not be the default pod/service network IPFamily

When deploying a dual stack HostedCluster the user can define networks like this:


  networking:
    clusterNetwork:      
    - cidr: fd01::/48             
      hostPrefix: 64
    - cidr: 10.132.0.0/14
      hostPrefix: 23
    networkType: OVNKubernetes             
    serviceNetwork:          
    - cidr: fd02::/112
    - cidr: 172.31.0.0/16

This will led to missconfiguration on the hosted cluster where services will have its ClusterIP set to IPv6 family (pod network will still default to IPv4 no matter what the order was).

When deployin a dualstack cluster with the openshift-install binary there is a validation in place that will prevent users from configuring default IPv6 networks when deploying dual-stack clusters:

ERROR failed to fetch Master Machines: failed to load asset "Install Config": failed to create install config: invalid "install-config.yaml" file: [networking.serviceNetwork: Invalid value: "fd02::/112, 172.30.0.0/16": IPv4 addresses must be listed before IPv6 addresses, networking.clusterNetwork: Invalid value: "fd01::/48, 10.132.0.0/14": IPv4 addresses must be listed before IPv6 addresses]

ERROR failed to fetch Master Machines: failed to load asset "Install Config": failed to create install config: invalid "install-config.yaml" file: networking.clusterNetwork: Invalid value: "fd01::/48, 10.132.0.0/14": IPv4 addresses must be listed before IPv6 addresses     

HyperShift should detect this and either block the cluster creation or swap the order so the cluster gets created with default IPv4 networks.

latest

Always

1. Deploy a HC with the networking settings specified and using the image with dual stack patches included quay.io/jparrill/hypershift:OCPBUGS-15331-mix-413v12

Cluster gets deployed with default IPv6 family for services network.

Cluster creation gets blocked OR cluster gets deployed with default IPv4 family for services network.