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main.go
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main.go
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package main
import (
"flag"
"io"
"os"
"os/signal"
"syscall"
"time"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/klog"
)
var (
kubeconfig string
masterURL string
hostsPath string
)
func init() {
flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
flag.StringVar(&masterURL, "master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
flag.StringVar(&hostsPath, "hostsfile", "", "Path to the hosts file. Log to standard out if missing.")
}
func main() {
klog.InitFlags(nil)
flag.Parse()
stopCh := make(chan struct{})
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
close(stopCh)
}()
cfg, err := clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)
if err != nil {
klog.Fatalf("Error building kubeconfig: %s", err.Error())
}
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
klog.Fatalf("Error building kubernetes clientset: %s", err.Error())
}
informerFactory := informers.NewSharedInformerFactory(kubeClient, 10*time.Second)
var hostsWriter io.Writer = os.Stdout
if hostsPath != "" {
klog.Infof("Using hosts file: %s", hostsPath)
hostsWriter = atomicFileWriter{hostsPath}
} else {
klog.Info("Logging hosts updates to stdout")
}
controller := newController(kubeClient, informerFactory.Core().V1().Nodes(), hostsWriter)
informerFactory.Start(stopCh)
if err := controller.Run(stopCh, nil); err != nil {
klog.Fatalf("Failed to run controller loop: %s", err)
}
}