client-go 实现一个自动创建ingress资源的controller

需求：

创建的service annotaion中如果包含ingress/http: "true"的时候，会自动将该服务的ingress资源创建出来，当删除掉ingress/http: "true"的时候，自动删除ingress，同时将service删除掉的时候也会自动删除ingress

main.go

Go 复制代码

package main

import (
	"ingress-expose/pkg"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
	"log"
)

func main() {
	//1. config

	// 从集群外部创建一个cofnig
	config, err := clientcmd.BuildConfigFromFlags("", clientcmd.RecommendedHomeFile)
	if err != nil {
		// 从集群内部创建一个config
		inClusterConfig, err := rest.InClusterConfig()
		if err != nil {
			log.Fatalln("can't get config")
		}
		config = inClusterConfig
	}

	//2. create client
	clientSet, err := kubernetes.NewForConfig(config)
	if err != nil {
		log.Fatalln("can't create clientSet")
	}

	//3. create informer
	factory := informers.NewSharedInformerFactory(clientSet, 0)
	serviceInformer := factory.Core().V1().Services()
	ingressInformer := factory.Networking().V1().Ingresses()

	//4. add event handler
	controller := pkg.NewController(clientSet, serviceInformer, ingressInformer)

	//5.informer.Start
	stopCh := make(chan struct{})
	factory.Start(stopCh)
	factory.WaitForCacheSync(stopCh)
	controller.Run(stopCh)
}

controller.go

Go 复制代码

package main

import (
	"ingress-expose/pkg"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
	"log"
)

func main() {
	//1. config

	// 从集群外部创建一个cofnig
	config, err := clientcmd.BuildConfigFromFlags("", clientcmd.RecommendedHomeFile)
	if err != nil {
		// 从集群内部创建一个config
		inClusterConfig, err := rest.InClusterConfig()
		if err != nil {
			log.Fatalln("can't get config")
		}
		config = inClusterConfig
	}

	//2. create client
	clientSet, err := kubernetes.NewForConfig(config)
	if err != nil {
		log.Fatalln("can't create clientSet")
	}

	//3. create informer
	factory := informers.NewSharedInformerFactory(clientSet, 0)
	serviceInformer := factory.Core().V1().Services()
	ingressInformer := factory.Networking().V1().Ingresses()

	//4. add event handler
	controller := pkg.NewController(clientSet, serviceInformer, ingressInformer)

	//5.informer.Start
	stopCh := make(chan struct{})
	factory.Start(stopCh)
	factory.WaitForCacheSync(stopCh)
	controller.Run(stopCh)
}