mirror of https://github.com/linkerd/linkerd2.git
117 lines
3.9 KiB
Go
117 lines
3.9 KiB
Go
package main
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import (
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"context"
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"flag"
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"net"
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"os"
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"os/signal"
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"regexp"
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"syscall"
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"time"
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"github.com/linkerd/linkerd2/controller/api/public"
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"github.com/linkerd/linkerd2/pkg/admin"
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"github.com/linkerd/linkerd2/pkg/config"
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"github.com/linkerd/linkerd2/pkg/flags"
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"github.com/linkerd/linkerd2/pkg/healthcheck"
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"github.com/linkerd/linkerd2/pkg/k8s"
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pkgK8s "github.com/linkerd/linkerd2/pkg/k8s"
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"github.com/linkerd/linkerd2/pkg/trace"
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"github.com/linkerd/linkerd2/web/srv"
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log "github.com/sirupsen/logrus"
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)
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func main() {
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cmd := flag.NewFlagSet("public-api", flag.ExitOnError)
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addr := cmd.String("addr", ":8084", "address to serve on")
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metricsAddr := cmd.String("metrics-addr", ":9994", "address to serve scrapable metrics on")
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apiAddr := cmd.String("api-addr", "127.0.0.1:8085", "address of the linkerd-controller-api service")
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grafanaAddr := cmd.String("grafana-addr", "127.0.0.1:3000", "address of the linkerd-grafana service")
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templateDir := cmd.String("template-dir", "templates", "directory to search for template files")
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staticDir := cmd.String("static-dir", "app/dist", "directory to search for static files")
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reload := cmd.Bool("reload", true, "reloading set to true or false")
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controllerNamespace := cmd.String("controller-namespace", "linkerd", "namespace in which Linkerd is installed")
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enforcedHost := cmd.String("enforced-host", "", "regexp describing the allowed values for the Host header; protects from DNS-rebinding attacks")
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kubeConfigPath := cmd.String("kubeconfig", "", "path to kube config")
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traceCollector := flags.AddTraceFlags(cmd)
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flags.ConfigureAndParse(cmd, os.Args[1:])
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_, _, err := net.SplitHostPort(*apiAddr) // Verify apiAddr is of the form host:port.
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if err != nil {
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log.Fatalf("failed to parse API server address: %s", *apiAddr)
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}
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client, err := public.NewInternalClient(*controllerNamespace, *apiAddr)
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if err != nil {
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log.Fatalf("failed to construct client for API server URL %s", *apiAddr)
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}
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globalConfig, err := config.Global(pkgK8s.MountPathGlobalConfig)
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clusterDomain := globalConfig.GetClusterDomain()
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if err != nil || clusterDomain == "" {
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clusterDomain = "cluster.local"
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log.Warnf("failed to load cluster domain from global config: [%s] (falling back to %s)", err, clusterDomain)
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}
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k8sAPI, err := k8s.NewAPI(*kubeConfigPath, "", "", 0)
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if err != nil {
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log.Fatalf("failed to construct Kubernetes API client: [%s]", err)
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}
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// Setup health checker
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checks := []healthcheck.CategoryID{
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healthcheck.KubernetesAPIChecks,
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healthcheck.KubernetesVersionChecks,
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healthcheck.LinkerdConfigChecks,
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healthcheck.LinkerdControlPlaneExistenceChecks,
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healthcheck.LinkerdAPIChecks,
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healthcheck.LinkerdVersionChecks,
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healthcheck.LinkerdControlPlaneVersionChecks,
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}
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hc := healthcheck.NewHealthChecker(checks, &healthcheck.Options{
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ControlPlaneNamespace: *controllerNamespace,
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KubeConfig: *kubeConfigPath,
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APIAddr: *apiAddr,
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})
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cm, _, err := healthcheck.FetchLinkerdConfigMap(k8sAPI, *controllerNamespace)
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if err != nil {
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log.Errorf("Failed to fetch linkerd-config: %s", err)
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}
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uuid := string(cm.GetUID())
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stop := make(chan os.Signal, 1)
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signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
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if *traceCollector != "" {
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if err := trace.InitializeTracing("linkerd-web", *traceCollector); err != nil {
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log.Warnf("failed to initialize tracing: %s", err)
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}
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}
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reHost, err := regexp.Compile(*enforcedHost)
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if err != nil {
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log.Fatalf("invalid --enforced-host parameter: %s", err)
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}
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server := srv.NewServer(*addr, *grafanaAddr, *templateDir, *staticDir, uuid,
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*controllerNamespace, clusterDomain, *reload, reHost, client, k8sAPI, hc)
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go func() {
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log.Infof("starting HTTP server on %+v", *addr)
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server.ListenAndServe()
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}()
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go admin.StartServer(*metricsAddr)
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<-stop
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log.Infof("shutting down HTTP server on %+v", *addr)
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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server.Shutdown(ctx)
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}
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