tree 46517933cf9c0d9fc18ccf085dcf335d664e2b94
parent 1947e9b1480d9a3e90fe8b12bc897fd5cd2abce7
author Jan Schär <jan@monogon.tech> 1741278442 +0100
committer Jan Schär <jan@monogon.tech> 1742306525 +0000

m/node/kubernetes: implement storage resizing

This implements persistent volume resizing in the storage provisioner.
The logic is based on https://github.com/kubernetes-csi/external-resizer

The mutation caches are an optimization to prevent unnecessary repeated
processing, because they make the controller remember changes that it
has made itself, when the watch events for those changes have not
arrived yet.

The controller supports the RecoverVolumeExpansionFailure feature, which
allows reducing the requested size when the previous resize fails due to
insufficient space. When resize fails, it is retried with backoff.

Change-Id: I0f3d40c1a592b30d25739f5d20b529dfe25dfbe1
Reviewed-on: https://review.monogon.dev/c/monogon/+/4008
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI