Epic Goal

• Support the ability to migrate a cluster from the ovn-kubernetes CNI plugin to the openshift-sdn CNI plugin.

Why is this important?

• Customers that need to migrate from the default CNI plugin of OpenShift 4.12+ (ovn-kubernetes) to the older openshift-sdn CNI plugin is expected to be rare, but non-zero. The possibility exists that a long-time user of openshift-sdn will opt to install or migrate to ovn-kubernetes for its new features, and after some time of use, determine it necessary to go back to openshift-sdn, for whatever reason. This Epic adds support for that "reverse" migration, and builds upon the logic currently used for rollbacks during the already-supported openshift-sdn to ovn-kubernetes migration process.

Acceptance Criteria

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

DOD

1. Reverse migration operates and has instructions for users, as well as full test coverage for CI & QE.

Dependencies (internal and external)

1. ...

Previous Work (Optional):

1. The rollback process already supported in openshift-sdn to ovn-kubernetes migrations.

Open questions::

1. …

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>