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  1. OpenShift Bugs
  2. OCPBUGS-25720

Document LB type dual-stack services limitation in Openstack

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      Description of problem:

      LB type services in a dual-stack cluster in Openstack cannot handle IPv4 and IPv6 families at the same time, so they are limited to single-stack due to a limitation in the OCCM (Openstack Cloud Controller Manager) component.

From OCCM docs [1]:

If two address families are specified in service's `spec.ipFamilies`, OCCM will respect the specified order and create an IPv4 or IPv6 load balancer based on the first specified address family. Note that creation of two load balancers for services with two `spec.ipFamilies` is not yet supported by OCCM.

      Version-Release number of selected component (if applicable):

      4.15 and consider adding it to 4.14 where dual-stack is Tech Preview

      Additional info:

      [1] https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/openstack-cloud-controller-manager/expose-applications-using-loadbalancer-type-service.md#ipv4--ipv6-dual-stack-services    

              ocp-docs-bot OCP DocsBot
              juriarte@redhat.com Jon Uriarte
              Itshak Brown Itshak Brown
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                Created:
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