openstack/magnum-capi-helm
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Magnum driver that uses Kubernetes Cluster API via Helm.
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README.rst

magnum-capi-helm

OpenStack Magnum driver using helm to create k8s clusterswith Cluster API.

The helm charts started out in August 2021 to build a template for creating K8s on OpenStack using Cluster API: https://github.com/stackhpc/capi-helm-charts

The helm charts have been in use by Azimuth since early 2022 to create Kubernetes clusters on OpenStack, in preference to previous Magnum support: https://github.com/stackhpc/azimuth

There has been an ongoing effort since October 2021 to create a Magnum driver that makes use of the above helm charts, with a view to replace the existing Heat based driver: https://review.opendev.org/c/openstack/magnum/+/815521

In early 2023 we discovered Vexhost had created thier own Cluster API Magnum driver, out of tree: https://github.com/vexxhost/magnum-cluster-api

After PTG discussons, we wanted something that would merge upstream and allowed for simple downstream modifications of templates, with updates that are independent of Magnum releases. The helm abstraction looked best able to deliver these aims, alongside being equaly useful outside of Magnum, potentially operated using ArgoCD or similar.

Where possible, this driver is attempting to re-use logic from the vexhost driver, in the hope of both drivers eventually sharing more code, prehaps similar to the old cut and paste openstack common of old. In particular, the vexhost driver had already fixed some nasty problems around ensuring the existing "coe credentials" API calls work with Cluster API, and being able to generate appropriate application credentials for use with both Cluster API Provider OpenStack (CAPO) and Cloud Provider OpenStack, with appropriate ca cetificates included.