kubernetes - 您如何设置kubernetes RBAC资源，以便Pod可以通过客户端访问API？

Question

问题

我有一个简单的RBAC配置，可以访问Kubernetes API集群。但是，我从kubectl中得到了似乎有冲突的信息。部署 list 后，似乎RBAC已正确设置。

$ kubectl exec -ti pod/controller -- kubectl auth can-i get namespaces
Warning: resource 'namespaces' is not namespace scoped
yes

但是，实际上发出请求会产生权限错误

$ kubectl exec -ti pod/controller -- kubectl get namespaces
Error from server (Forbidden): namespaces is forbidden: User "system:serviceaccount:default:controller" cannot list resource "namespaces" in API group "" at the cluster scope
command terminated with exit code 1

表现

apiVersion: 'v1'
kind: 'ServiceAccount'
metadata:
  name: 'controller'
---

apiVersion: 'rbac.authorization.k8s.io/v1'
kind: 'Role'
metadata:
  name: 'read-namespaces'
rules:
  - apiGroups:
      - ''
    resources:
      - 'namespaces'
    verbs:
      - 'get'
      - 'watch'
      - 'list'
---

apiVersion: 'rbac.authorization.k8s.io/v1'
kind: 'RoleBinding'
metadata:
  name: 'read-namespaces'
roleRef:
  apiGroup: ''
  kind: 'Role'
  name: 'read-namespaces'
subjects:
  - kind: 'ServiceAccount'
    name: 'controller'
---

apiVersion: 'v1'
kind: 'Pod'
metadata:
  name: 'controller'
  labels:
    'app': 'controller'
spec:
  containers:
    - name: 'kubectl'
      image: 'bitnami/kubectl:latest'
      imagePullPolicy: 'Always'
      command:
        - 'sleep'
        - '3600'
  serviceAccountName: 'controller'
---

其他资讯

我试过了 kubectl auth reconcile -f manifest.yaml和 kubectl apply -f manifest.yaml，结果是一样的。

我还将“读取命名空间” RoleBinding.subjects[0].namespace设置为适当的命名空间(在这种情况下为“默认”)。输出无变化。

Answer 1

命名空间是群集范围的资源。因此，您需要一个ClusterRole和ClusterRoleBinding。

apiVersion: 'rbac.authorization.k8s.io/v1'
kind: 'ClusterRole'
metadata:
  name: 'read-namespaces'
rules:
  - apiGroups:
      - ''
    resources:
      - 'namespaces'
    verbs:
      - 'get'
      - 'watch'
      - 'list'
---

apiVersion: 'rbac.authorization.k8s.io/v1'
kind: 'ClusterRoleBinding'
metadata:
  name: 'read-namespaces'
roleRef:
  apiGroup: 'rbac.authorization.k8s.io'
  kind: 'ClusterRole'
  name: 'read-namespaces'
subjects:
  - kind: 'ServiceAccount'
    name: 'controller'
---