[Solved] Why will this RoleBinding fail to grant permissions?apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: bind-role namespace: default subjects: - kind: User name: bob roleRef:... | Kubernetes

Kubernetes - RBAC and Security

Why will this RoleBinding fail to grant permissions?

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: bind-role
  namespace: default
subjects:
- kind: User
  name: bob
roleRef:
  kind: ClusterRole
  name: admin
  apiGroup: rbac.authorization.k8s.io

ARoleBinding cannot bind ClusterRole without ClusterRoleBinding

BRoleBinding cannot reference a ClusterRole

CNamespace field is missing

DUser 'bob' does not exist

Step-by-Step Solution

Solution:

Step 1: Understand RoleBinding and ClusterRole relationship
RoleBinding can reference ClusterRole but only within the namespace.
Step 2: Check if ClusterRoleBinding is required
To grant cluster-wide permissions, ClusterRoleBinding is needed; RoleBinding limits scope to namespace.
Final Answer:
RoleBinding cannot bind ClusterRole without ClusterRoleBinding -> Option A
Quick Check:
ClusterRoleBinding needed for cluster-wide permissions [OK]

Quick Trick: Use ClusterRoleBinding to bind ClusterRole cluster-wide [OK]

Common Mistakes:

Assuming RoleBinding grants cluster-wide permissions
Ignoring need for ClusterRoleBinding
Confusing RoleBinding and ClusterRoleBinding

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Why will this RoleBinding fail to grant permissions?

Step 1: Understand RoleBinding and ClusterRole relationship

Step 2: Check if ClusterRoleBinding is required

Final Answer:

Quick Check:

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