Kubernetes: upgrades and scaling (with bbolt) #3925
Description
Please correct me if I'm wrong but right now only bbolt is supported for at least some of the data that is stored in the Nuts Node. Even when SQL storage is configured. This has a couple of downsides:
- Upgrades; Zero-downtime upgrades are impossible since there can only be one instance.
- High-availability; Not supported since there can only be one instance.
Right now you can configure replicas and/or autoscaling but both won't work (due to the issues above). It would be better to switch from a Deployment to a StatefulSet with a static replica of 1.