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Kubernetes RBAC Security

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Kubernetes RBAC (Role-Based Access Control) controls who can do what in K8s. Define Roles (permissions), Bindings (assign roles to users/services), Service Accounts (pod identity). Mastery takes 6-8 weeks. Practitioners earn 35-45% premium because they prevent breaches. The 2% who architect zero-trust K8s (least-privilege everything) are highly valued in security roles.

Menene Kubernetes RBAC Security

Kubernetes RBAC is the authorization system that determines who can perform what actions on which resources. It uses Roles (define permissions), RoleBindings (assign roles to users/service accounts), and Service Accounts (pod identity). When a user or pod makes an API call to K8s, the API server checks RBAC: is this entity authorized? If yes, proceed. If no, 403 Forbidden. RBAC is declarative: define in YAML, apply to cluster. Scales from single developer to multi-team organizations with different permission levels.

🔧 KAYAN AIKI & YANAYIN AIKI
Kubernetes RBACkubectlRoles and ClusterRolesRoleBindingsService AccountsOIDC providersNetwork policiesPod security policies

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What's the difference between Role and ClusterRole?
Role = namespaced (permissions for resources in one namespace). ClusterRole = cluster-wide (permissions for all namespaces or cluster-level resources like nodes). Most roles are namespaced; ClusterRole for cluster admins.
How do service accounts work?
Service accounts are pod identities. Pod mounts service account token (JWT) from a Secret. When pod makes API call to K8s API server, it authenticates using token. Server checks RBAC: is this service account allowed to do X? If yes, allow.
What's the principle of least privilege?
Give each service account minimum permissions needed. Pod for metrics collection only reads metrics, not secrets. Pod for logs only reads logs. Breach of one pod doesn't compromise entire cluster.
Can I use external identity (OIDC) for RBAC?
Yes. Integrate K8s with OIDC provider (GitHub, Google). Users authenticate via OIDC, get JWT with claims (team, role). K8s binds OIDC subject to Roles. Better than static kubeconfig.
What about Network Policies?
RBAC controls API access. Network Policies control network traffic (which pods can talk to which). Defense in depth: both RBAC + Network Policies.

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