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go - 缺少测试用户的权限

问题描述

我使用官方 golang kubernetes lib 支持的 watcherList 来获取有关 kubernetes 命名空间内创建、更新和删除服务的通知。这里是片段。

func (kc *KubernetesCollector) streamEvents(ctx context.Context) {
    kc.debugChannel <- fmt.Sprintf("Start streaming events from kubernetes API")

    watchList := cache.NewListWatchFromClient(kc.k8sClient.RESTClient(), "services", kc.k8sNamespace, fields.Everything())

    notificationCallbackToAddService := func(svc interface{}) {
        service := svc.(*v1.Service)
        kc.serviceNotificationChannel <- &serviceNotification{service, "add"}
    }

    notificationCallbackToDeleteService := func(svc interface{}) {
        service := svc.(*v1.Service)
        kc.serviceNotificationChannel <- &serviceNotification{service, "remove"}
    }

    callbacks := cache.ResourceEventHandlerFuncs{
        AddFunc:    notificationCallbackToAddService,
        DeleteFunc: notificationCallbackToDeleteService,
    }

    _, controller := cache.NewInformer(watchList, &v1.Service{}, time.Second*0, callbacks)
    go controller.Run(ctx.Done())
}

在我的测试中，我声明了kc.k8sClient在k8sAPI变量中定义的公共 api 地址。此外，我将承载令牌设置为针对集群进行身份验证并跳过验证不安全的 ssl 证书。

func TestK8sWatchList(t *testing.T) {
    require := require.New(t)
    ...
    k8sConfig, err := clientcmd.BuildConfigFromFlags(k8sAPI, "")
    require.NoError(err)

    k8sConfig.BearerToken = "<bearerToken>"
    k8sConfig.Transport = &http.Transport{
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true,
        },
    }
    k8sClient, err := kubernetes.NewForConfig(k8sConfig)

    k8sCollector := NewK8sCollector(k8sClient, k8sNamespace)

    ...
}

当我执行测试时，我收到以下错误消息：

go test -v -timeout 500s <replaced>/t1k/pkg/collector -run TestK8sWatchList
=== RUN   TestK8sWatchList
11.02.2020 16:55:55 DEBUG: Start streaming events from kubernetes API
E0211 16:55:51.706530  121803 reflector.go:153] pkg/mod/k8s.io/client-go@v0.0.0-20200106225816-7985654fe8ee/tools/cache/reflector.go:105: Failed to list *v1.Service: forbidden: User "system:serviceaccount:t1k:t1k-test-serviceaccount" cannot get path "/namespaces/t1k/services"
E0211 16:55:52.707520  121803 reflector.go:153] pkg/mod/k8s.io/client-go@v0.0.0-20200106225816-7985654fe8ee/tools/cache/reflector.go:105: Failed to list *v1.Service: forbidden: User "system:serviceaccount:t1k:t1k-test-serviceaccount" cannot get path "/namespaces/t1k/services"
E0211 16:55:53.705539  121803 reflector.go:153] pkg/mod/k8s.io/client-go@v0.0.0-20200106225816-7985654fe8ee/tools/cache/reflector.go:105: Failed to list *v1.Service: forbidden: User "system:serviceaccount:t1k:t1k-test-serviceaccount" cannot get path "/namespaces/t1k/services"

我不明白为什么会收到错误消息，因为我认为服务帐户“t1k-test-serviceaccount”具有所有必需的权限。现在为测试用户定义了服务帐户、角色和角色绑定。

apiVersion: v1
kind: ServiceAccount
metadata:
  namespace: t1k
  name: t1k-test-serviceaccount
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: t1k
  name: t1k-test-role
rules:
- apiGroups: [""]   # "" indicates the core API group
  resources: ["*"]
  verbs: ["*"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  namespace: t1k
  name: t1k-test-rolebinding
subjects:
- name: t1k-test-serviceaccount
  kind: ServiceAccount
  apiGroup: ""
roleRef:
  name: t1k-test-role
  kind: Role
  apiGroup: rbac.authorization.k8s.io

附加信息：

标签： gotestingkubernetespermissions

解决方案

您可以使用以下命令检查服务帐户的权限：

kubectl auth can-i list services --namespace t1k --as=system:serviceaccount:t1k:t1k-test-serviceaccount

您不需要手动设置令牌...您可以InClusterConfig像本示例中那样使用。Client-go 使用挂载在 Pod 内的服务帐户令牌，位于 /var/run/secrets/kubernetes.io/serviceaccount 路径时使用了 rest.InClusterConfig()。

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