apiVersion: v1
kind: ServiceAccount
metadata:
  name: adminxxxxxx
  namespace: kube-system

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-hehe
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: adminxxxxxx
  namespace: kube-system

验证

kubectl -n kube-system get sa adminxxxxxx
kubectl get clusterrolebindings admin-hehe