Set force-deletion flag when creating shoot-cluster [KIM/feature]

[tobiscr]

Description

Gardner supports now the option to force the deletion of a cluster (which avoids longer waiting-periods during the de-provisioning e.g. the K8s cluster couldn't be gracefully stopped caused by hanging finalizers).

We agreed to use this feature flag and the infrastructure manager / provisioner should set this flag properly.

AC:

• The annotation confirmation.gardener.cloud/force-deletion is set in the shoot-specs of Gardener clusters.

Reasons

Enable/accept non-graceful shutdowns of Gardener clusters to avoid longer waiting periods during the de-provisioning.

Attachments

• https://gardener.cloud/docs/gardener/shoot_operations/#force-deletion

[Moved from Provisioner to KIM]

[tobiscr]

Pre-requisite for kyma-project/kyma#18198

[Disper]

@tobiscr should that annotation be set for only new clusters or should also existing clusters be migrated at some point?
E.g. should the migrator also add that annotation to the Runtime CRs it creates?

[Disper]

Confirmed that we want to set it only for new clusters.

[Disper]

According to what I've tried - it's not possible to just create a cluster with that annotation set.

This is only possible if the Shoot fails to be deleted normally.

For more details, please refer to the relevant Gardener docu.

It could be possible to do it differently and when we fail to delete a cluster with one of those listed error messages to apply the annotation then.

[tobiscr]

JFYI - @pbochynski :

After deeper investigation, we realised that this features collides with #126 :

• The deletion flag becomes obsolete when we support the hibernation of clusters as save-deletion-approach
• We recommend to postpone this feature until we have Safe deletion of Kyma Clusters [EPIC] #126 implemented. For the house-keeping we can still consider the force-deletion option.

[pbochynski]

Yes - we can postpone this one. We should also check how Gardener handles the deletion of hibernated clusters. Maybe the force-deletion annotation will help to reduce the time.

[tobiscr]

We will for now not work on it, until we discovered how hibernation works. Possible that we can reuse this flag for deleting hibernated clusters faster.