Epic Goal

• Add tech-preview support to replace HAproxy & Keepalived by FRR, on the control plane, to load-balance the VIP traffic for both API & Ingress services

Why is this important?

• Multiple (large) customers are requesting a stretched control plane where the VIPs would have to be able to float between multiple Failure Domains, for high availability
• Using BGP Anycast to route the VIPs traffic would be more efficient than using Keepalived

Scenarios

• with Keepalived, the VIP is on one host, so all API & Ingress traffic goes through one host at a time and when a failure happens, the VIP moves to another available node.
• with BGP Anycast, the VIP is on all control plane nodes and BGP will provide the more efficient route to the client for reaching it.
  • When paths to reach the VIP is equal between the domains, BGP will loadbalance the traffic (configurable at the infrastructure level), so no more bottleneck
  • If a node or service (API, ingress) becomes unavailable, BGP will update the routing table and remove the route instantaneously.

Acceptance Criteria

• CI - MUST be running successfully with tests automated
• Release Technical Enablement - Provide necessary release enablement details and documents.
• ...

Dependencies (internal and external)

1. https://issues.redhat.com/browse/OCPCLOUD-1372 to be finished and delivered in 4.12
2. https://issues.redhat.com/browse/OSASINFRA-2998 to be delivered as Tech Preview in 4.13

Open questions::

none for now.

Done Checklist

• CI - CI is running, tests are automated and merged.
• Enhancement - <link to Enhancement PR>
• Release Enablement <link to Feature Enablement Presentation>
• DEV - Upstream code and tests merged: <link to meaningful PR or GitHub Issue>
• DEV - Upstream documentation merged: <link to meaningful PR or GitHub Issue>
• DEV - Downstream build attached to advisory: <link to errata>
• QE - Test plans in Polarion: <link or reference to Polarion>
• QE - Automated tests merged: <link or reference to automated tests>
• DOC - Downstream documentation merged: <link to meaningful PR>