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capacity: document ownership design
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@pohly
pohly committed Aug 14, 2020
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Expand Up @@ -128,6 +128,15 @@ information](https://kubernetes.io/docs/concepts/storage/storage-capacity]
when selecting nodes for pods with unbound volumes that wait for the
first consumer.

Currently, all CSIStorageCapacity objects created by an instance of
the external-provisioner must have the same
[owner](https://kubernetes.io/docs/concepts/workloads/controllers/garbage-collection/#owners-and-dependents). That
owner is how external-provisioner distinguishes between objects that
it must manage and those that it must leave alone. The owner is
determine with the `POD_NAME/POD_NAMESPACE` environment variables and
the `--capacity-ownerref-level` parameter. Other solutions will be
added in the future.

To enable this feature in a driver deployment (see also the
[`deploy/kubernetes/storage-capacity.yaml`](deploy/kubernetes/storage-capacity.yaml)
example):
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