[jauntywundrkind]

This indeed seems like The Way but I have no idea how it works when storage is involved. How do Rook or any other storage providers deal with this?

If Kubernetes is only for stateless services, well, that's much less useful for the org to invest in.

[unethical_ban]

Any state that a container uses, such as databases or static assets, should be mapped to something outside k8s, no? I thought container orchestration was only for app later

[prng2021]

In the early days that was true. K8s has had many options for stateful containers for a while though.

https://kubernetes.io/docs/concepts/storage/

[prmoustache]

we are talking in a context where you would spin up a new cluster whenever you want to upgrade kubernetes version.

In that case you don't want to migrate application/user data so you are kind of forced to keep DBs and filesystems outside.