Epic Goal

As an OpenShift infrastructure owner I need to deploy OCP on OpenStack with the installer-provisioned infrastructure workflow and configure my own load balancers

Why is this important?

Customers want to use their own load balancers and IPI comes with built-in LBs based in keepalived and haproxy. 

Scenarios

1. A large deployment routed across multiple failure domains without stretched L2 networks, would require to dynamically route the control plane VIP traffic through load-balancers capable of living in multiple L2.
2. Customers who want to use their existing LB appliances for the control plane.

Acceptance Criteria

• Should we require the support of migration from internal to external LB?
• CI - MUST be running successfully with tests automated
• Release Technical Enablement - Provide necessary release enablement details and documents.
• QE - must be testing a scenario where we disable the internal LB and setup an external LB and OCP deployment is running fine.
• Documentation - we need to document all the gotchas regarding this type of deployment, even the specifics about the load-balancer itself (routing policy, dynamic routing, etc)

Dependencies (internal and external)

1. Fixed IPs would be very interesting to support, already WIP by vsphere (need to Spike on this): https://issues.redhat.com/browse/OCPBU-179
2. Confirm with customers that they are ok with external LB or they prefer a new internal LB that supports BGP

Previous Work:

vsphere has done the work already via https://issues.redhat.com/browse/SPLAT-409

Done Checklist

• CI - CI is running, tests are automated and merged.
• 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>

Notes: https://github.com/EmilienM/ansible-role-routed-lb is an example of a LB that will be used for CI, can be used by QE and customers.