Merge pull request kubernetes#46047 from mml/master-debug-logs

Automatic merge from submit-queue

Add version and flag info to apiserver and CM logs.

Should help debugging.
Specifically for kubernetes#45706

Author: Kubernetes Submit Queue

cmd/kube-apiserver/app/server.go

@@ -104,6 +104,9 @@ cluster's shared state through which all other components interact.`,
 
 // Run runs the specified APIServer.  This should never exit.
 func Run(runOptions *options.ServerRunOptions, stopCh <-chan struct{}) error {
+	// To help debugging, immediately log version
+	glog.Infof("Version: %+v", version.Get())
+
 	nodeTunneler, proxyTransport, err := CreateNodeDialer(runOptions)
 	if err != nil {
 		return err

cmd/kube-controller-manager/app/BUILD

@@ -73,6 +73,7 @@ go_library(
         "//pkg/serviceaccount:go_default_library",
         "//pkg/util/configz:go_default_library",
         "//pkg/util/io:go_default_library",
+        "//pkg/version:go_default_library",
         "//pkg/volume:go_default_library",
         "//pkg/volume/aws_ebs:go_default_library",
         "//pkg/volume/azure_dd:go_default_library",

cmd/kube-controller-manager/app/controllermanager.go

@@ -57,6 +57,7 @@ import (
 	serviceaccountcontroller "k8s.io/kubernetes/pkg/controller/serviceaccount"
 	"k8s.io/kubernetes/pkg/serviceaccount"
 	"k8s.io/kubernetes/pkg/util/configz"
+	"k8s.io/kubernetes/pkg/version"
 
 	"github.com/golang/glog"
 	"github.com/prometheus/client_golang/prometheus"
@@ -102,6 +103,8 @@ func ResyncPeriod(s *options.CMServer) func() time.Duration {
 
 // Run runs the CMServer.  This should never exit.
 func Run(s *options.CMServer) error {
+	// To help debugging, immediately log version
+	glog.Infof("Version: %+v", version.Get())
 	if err := s.Validate(KnownControllers(), ControllersDisabledByDefault.List()); err != nil {
 		return err
 	}

staging/src/k8s.io/apiserver/pkg/util/flag/flags.go

@@ -43,9 +43,12 @@ func WarnWordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedNam
 	return pflag.NormalizedName(name)
 }
 
-// InitFlags normalizes and parses the command line flags
+// InitFlags normalizes, parses, then logs the command line flags
 func InitFlags() {
 	pflag.CommandLine.SetNormalizeFunc(WordSepNormalizeFunc)
 	pflag.CommandLine.AddGoFlagSet(goflag.CommandLine)
 	pflag.Parse()
+	pflag.VisitAll(func(flag *pflag.Flag) {
+		glog.Infof("FLAG: --%s=%q", flag.Name, flag.Value)
+	})
 }