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ganeti-extstorage-csi

Ganeti support for CSI through external storage interface.

WARNING: This software is still in development, some csi requirements are still missing, so it it not production ready.

Architecture

+--------------------+     +-----------------------+     +------------+
|                    |     |                       |     |            |
|       Ganeti       +-----> ganeti-extstorage-csi +-----> csi-driver |
|                    |     |                       |     |            |
+--------------------+     +------------+----------+     +------------+
                                        |
                                        |
                                        |
                                        |
                              +---------v----------+
                              |                    |
                              |  Metadata storage  |
                              |                    |
                              +--------------------+

ganeti-extstorage-csi implements ganeti-extstorage-interface. It translates Ganeti operations to CSI operations, and stores returned metadata in Metadata storage. During requests, ganeti-extstorage-csi contacts Metadata storage.

Metadata storage

Upon volume creation, CSI returns data, which is stored in Metadata storage. This data should be accessible on all nodes. For this, an etcd cluster is recommended to be set up across all nodes.

For testing/development purposes, a simple file based metadata storage is available, which stores metadata in files. This is just for development, not for production.

TODO

  • Make all operations as idempotent as possible.

Usage

TBD