Understanding role-based access control in Kubernetes

## Executive Summary This article explains Kubernetes RBAC fundamentals and best practices: how Roles, ClusterRoles, RoleBindings, and ClusterRoleBindings control access; examples of granting namespace-scoped and cluster-wide permissions; use of ClusterRoles with namespaced RoleBindings; aggregation of ClusterRoles; and critical cautions about uncommon verbs (bind, escalate, impersonate) and wildcard permissions. It recommends enforcing least-privilege access and careful management of RBAC to mitigate privilege escalation and risks from stolen or misconfigured identities.