OSAC CSI Driver

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The OSAC CSI driver is an aggregating meta-driver that presents a single CSI identity (csi.osac.openshift.io) to Kubernetes and routes storage requests to vendor-specific CSI drivers (NetApp Trident, VAST, Pure Storage) based on storage tier resolution from the OSAC fulfillment service.

Architecture

The driver runs in two modes controlled by Kubernetes deployment topology:

• Controller plugin (Deployment): Handles CreateVolume, DeleteVolume, ControllerPublishVolume, and ControllerUnpublishVolume by resolving the storage tier via the fulfillment service and proxying to the appropriate vendor CSI controller.

• Node plugin (DaemonSet): Handles NodeStageVolume, NodePublishVolume, and related RPCs by routing to vendor node plugins based on the osac.backend key in the volume context set at creation time.

Build

make build        # Build the binary
make test         # Run tests
make lint         # Run golangci-lint
make image-build  # Build container image
make image-push   # Push container image

Configuration

Flag	Default	Description
--csi-endpoint	unix:///csi/osac/csi.sock	CSI endpoint this driver listens on
--node-id	(required)	Node ID for NodeGetInfo
--driver-name	csi.osac.openshift.io	CSI driver name
--fulfillment-endpoint	(empty, uses stub)	gRPC endpoint for the OSAC fulfillment service
--vendor-sockets	(empty)	Comma-separated backend=socketpath pairs

License

Apache License 2.0. See LICENSE.