Authorization and authentication are critical security components. Without a proper set of permissions, we are risking exposure with potentially devastating results. Moreover, with appropriate Rules, Roles, and RoleBindings, we can make a cluster not only more secure but also increase collaboration between different members of our organization. The only trick is to find a right balance between tight security and freedom. It takes time until that equilibrium is established.
RBAC combined with Namespaces provides an excellent separation. Without Namespaces, we'd need to create multiple clusters. Without RBAC, those clusters would be exposed or locked down to only a handful of users. The two combined provide an excellent way to increase collaboration without sacrificing security.
We did not explore Service Accounts. They are the third kind of Subjects, besides Users...
