我使用watcherList(由官方的golang kubernetes库支持)来获取有关在kubernetes命名空间中创建,更新和删除服务的通知。这是代码段。
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kc.k8sClient
了在k8sAPI
变量中定义的over公共api地址。另外,我设置了承载令牌以针对集群进行身份验证,并跳过以验证不安全的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)
...
}
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/[email protected]/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/[email protected]/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/[email protected]/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:
我找到了解决方案。该结构的k8sClientSet
属性KubernetesCollector
是一个指针。包的反射功能pkg/mod/k8s.io/[email protected]
无法处理指针对象。
type KubernetesCollector struct {
...
k8sClient *kubernetes.ClientSet
namespace string
...
}
我更换了k8sClient与CoreV1Interface
从k8s.io/client-go/kubernetes/typed/core/v1
。因此,我更改了对ListWatch的调用。
type KubernetesCollector struct {
....
iface corev1.CoreV1Interface
namespace string
....
}
func (kc *KubernetesCollector) start(ctx context.Context) {
watchList := cache.NewListWatchFromClient(kc.iface.RESTClient(), "services", kc.namespace, fields.Everything())
....
}
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