Inhibiting Blockers and Node Annotation Blockers #1145
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Signed-off-by: Georg Doser <georg.doser@nitrado.net>
Inhibiting blockers will only block the final reboot command not the draining of nodes. Signed-off-by: Georg Doser <georg.doser@nitrado.net>
…dition Signed-off-by: Georg Doser <georg.doser@nitrado.net>
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This PR introduces the concept of "Inhibiting Blockers" and implements the node annotation blocker.
We have the use case in which we have to drain the node and once all pods are gone some final work will be done on the node. In cloud we have the cluster-autoscaler.kubernetes.io/scale-down-disabled annotation to prevent the cluster autoscaler to scale down to early.
We needed a similar mechanism for baremetal with kured so the idea was to also let kured check for a configured annotation and block the reboot.
However the current implementation of blockers also block draining the node so i had to introduce a new type of Blockers which i named "Inhibiting Blockers" in the flags.
This code was build and verified in one of our dev clusters.
This PR might also be a starting point to resolve #1130
I will also provide the necessary changes on the helm chart once i know that the flags etc will stay with the names.