KEP-669: Support Out-of-Tree OpenStack Cloud Provider

Supporting Out-of-Tree OpenStack Cloud Provider

Release Signoff Checklist
Summary
Motivation
- Goals
- Non-Goals
Proposal
- Implementation Details/Notes/Constraints [optional]
- Risks and Mitigations
Design Details
Implementation History

Release Signoff Checklist

k/enhancements issue in release milestone and linked to KEP (https://github.com/kubernetes/enhancements/issues/669 )
KEP approvers have set the KEP status to implementable
Design details are appropriately documentedbs
Test plan is in place, giving consideration to SIG Architecture and SIG Testing input
Graduation criteria is in place
“Implementation History” section is up-to-date for milestone
Supporting documentation e.g., additional design documents, links to mailing list discussions/SIG meetings, relevant PRs/issues, release notes

Summary

Build support for the out-of-tree OpenStack cloud provider. This involves a well-tested version of the cloud-controller-manager that has feature parity to the kube-controller-manager.

Motivation

Motivation for supporting out-of-tree providers can be found in the Cloud Controller Manager KEP . This KEP is specifically tracking progress for the OpenStack cloud provider.

Goals

Develop/test/release the OpenStack cloud-controller-manager
Kubernetes clusters running on OpenStack should be running the cloud-controller-manager.

Non-Goals

Removing in-tree OpenStack cloud provider code, this effort falls under the KEP for removing in-tree providers .

Proposal

The OpenStack Cloud Provider is implemented, tested and documented, It is being released with matching kubernetes version from release v1.11 . cloud-provider-openstack release 1.14, 1.15, 1.16 has been running in production.

Implementation Details/Notes/Constraints [optional]

OpenStack Cloud Provider is implemented here . This repository also hosts other drivers like CSI, ingress-controller etc. Cloud Provider OpenStack is in feature parity with the intree version. Removal of intree cloud providers is dependent on In-tree Storage Migration to CSI Plugin Migration . The migration work for intree OpenStack Volume driver to CSI Driver is in progress.

Risks and Mitigations

None as of now

Design Details

Test Plan

OpenStack Cloud Provider is well tested, CI running at OpenLab , results are reported to kubernetes test grid.

Graduation Criteria

This feature is complete, well tested, in parity with intree openstack provider. Documention regarding migration from in-tree cloud provider to openstack-cloud-controller-manager can be found here

Upgrade / Downgrade Strategy

TODO for SIG-OpenStack

Version Skew Strategy