cluster_role_binding.yml

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: my-cluster-role-binding
roleRef:
  kind: ClusterRole
  name: mycluster-clusterrole
  apiGroup: rbac.authorization.k8s.io
subjects:
  # Authorize specific service accounts:
  - kind: ServiceAccount
    name: default
    namespace: kube-system
  - kind: ServiceAccount
    name: default
    namespace: default
  - kind: Group
    apiGroup: rbac.authorization.k8s.io
    name: system:authenticated
  # Authorize specific users (not recommended):
  - kind: User
    apiGroup: rbac.authorization.k8s.io
    name: admin