Implementing RBAC for Kubernetes Cluster

Overview

Configure Kubernetes Role-Based Access Control (RBAC) to enforce least-privilege access to cluster resources. This skill covers Role/ClusterRole design, RoleBinding configuration, service account security, namespace isolation, and audit logging for multi-tenant Kubernetes environments.

Objectives

• Design RBAC role hierarchy for multi-tenant clusters
• Create granular Roles and ClusterRoles for different personas
• Configure RoleBindings and ClusterRoleBindings with least privilege
• Secure service accounts and limit their default permissions
• Integrate RBAC with external identity providers (OIDC)
• Audit and monitor RBAC usage with Kubernetes audit logs

Key Concepts

RBAC API Objects

1. Role: Namespace-scoped permissions (pods, services, deployments within a namespace)
2. ClusterRole: Cluster-wide permissions (nodes, namespaces, PVs, CRDs)
3. RoleBinding: Grants Role to users/groups/serviceAccounts in a namespace
4. ClusterRoleBinding: Grants ClusterRole cluster-wide