SharedInformerFactoryWithOptions - 无法根据标签进行过滤

Question

我想查看某个应用程序的 Kubernetes pod 事件。

我选择了 NewSharedInformerFactoryWithOptions。我已经添加了适当的标签选择器，但它没有被过滤掉。因为我想使用标签过滤它：'app=nats-box'

这是代码-

req, err := labels.NewRequirement("app", selection.Equals, []string{"nats-box"})
    if err != nil {
        log.Fatalf("error %s, bad requirement", err.Error())
    }
selector := labels.NewSelector()
selector.Add(*req)

filteredFactory := informers.NewSharedInformerFactoryWithOptions(clientset, 0, informers.WithNamespace("default"), informers.WithTweakListOptions(func(options *metav1.ListOptions) {
    options.LabelSelector = selector.String()
}))

podInformer := filteredFactory.Core().V1().Pods().Informer()

podInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
    AddFunc: func(obj interface{}) {
        fmt.Println("pod add")
        name := obj.(*corev1.Pod).Name
        labels := obj.(*corev1.Pod).Labels
        fmt.Printf("pod Name: %s\nLabels - %v\n\n", name, labels)
    })

我得到了所有 pods 的输出，命名空间正在过滤，但标签没有。无法弄清楚我在哪里犯了错误。

Answer 1

您可以直接在opts.LabelSelector中提供标签字符串：

labelOptions := informers.WithTweakListOptions(func(opts *metav1.ListOptions) {
    opts.LabelSelector = "app=nats-box"
})
factory := informers.NewSharedInformerFactoryWithOptions(clientset, 0, informers.WithNamespace("default") ,labelOptions)
informer := factory.Core().V1().Pods().Informer()
stopper := make(chan struct{})
defer close(stopper)
informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
    AddFunc: func(obj interface{}) {
        fmt.Println("pod add")
        name := obj.(*corev1.Pod).Name
        labels := obj.(*corev1.Pod).Labels
        fmt.Printf("pod Name: %s\nLabels - %v\n\n", name, labels)
    },
})
informer.Run(stopper)

Answer 2

如果要继续使用k8s.io/apimachinery/pkg/labels和选择包，调用selector.Add时需要re-assign选择器 because it returns a copy.

所以，替换

selector := labels.NewSelector()
selector.Add(*req)
fmt.Println(selector.String()) // empty string

和

selector := labels.NewSelector()
selector = selector.Add(*req)
fmt.Println(selector.String()) // app=nats-box

SharedInformerFactoryWithOptions - 无法根据标签进行过滤

SharedInformerFactoryWithOptions - Not able to filter based on labels

go

kubernetes

client-go