Thank you for getting back Jarland. I think RBAC is only meant for adding service accounts (for example from external services or CI) and to grant certain permissions to Users in the cluster.

However, there is currently no way to manage multi-user access as everyone logs in with the same certificate generated by your management software.

I did read that you as DigitalOcean are going to integrate more DigitalOean Team functionality into cluster administration. Perhaps this will be the solution.

However, at this point it is a security risk that someone who is offboarded from being a cluster admin, cannot be revoked access to it.

As the previous replies indicate, rbac can only be used to give users, groups and service accounts permissions in the cluster. Due to the fact, that every user that signs up to a digital ocean cluster has root (the same identity), this rbac stuff is not working here. Kubernetes allows generating users and can be configured to use something like OpenID Connect grant users access. From what I see, this is currently not available and so every user has cluster admin, which can be very ugly, because he can change every security setting.