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Default StorageClass would benefit from namespace binding #73879

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briantopping opened this Issue Feb 9, 2019 · 1 comment

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briantopping commented Feb 9, 2019

What would you like to be added:
The default StorageClass is currently marked with an annotation. Since StorageClass is namespace-free, it is a bit like the Highlander, there can be only one.

Why is this needed:

Because storage is such an unpredictable thing between installations, deployments often just add PV templates that depend on the some default StorageClass to act on them. I often use the CephFS provisioner with separate StorageClass instances to achieve security isolation provided by it's generation of separate authentication tokens and filesystem ACLs per instance. With a global default StorageClass, random PVCs would find themselves in the same space, breaking this isolation.

My current workflow when installing new deployments, I need to watch if they go Pending for volumes and see if I can create PVCs before the deployments timeout. In some cases where this iterates for a long time, I have no choice but apply the default annotation, but if it takes days to get the deployment finished and I forget to remove the annotation, the CephFS isolation might require extensive repair to delete artifacts of some future, unrelated install.

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briantopping commented Feb 9, 2019

/sig storage

@k8s-ci-robot k8s-ci-robot added sig/storage and removed needs-sig labels Feb 9, 2019

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