apiservers: add synchronous shutdown mechanism on SIGTERM+INT

cmd/hyperkube/BUILD

@@ -21,6 +21,7 @@ go_test(
     deps = [
         "//vendor/github.com/spf13/cobra:go_default_library",
         "//vendor/github.com/stretchr/testify/assert:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
     ],
 )
 
@@ -62,6 +63,7 @@ go_library(
         "//plugin/cmd/kube-scheduler/app/options:go_default_library",
         "//vendor/github.com/spf13/pflag:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
+        "//vendor/k8s.io/apiserver/pkg/server:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/server/healthz:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/flag:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/logs:go_default_library",

cmd/hyperkube/federation-apiserver.go

@@ -17,7 +17,6 @@ limitations under the License.
 package main
 
 import (
-	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/kubernetes/federation/cmd/federation-apiserver/app"
 	"k8s.io/kubernetes/federation/cmd/federation-apiserver/app/options"
 )
@@ -30,9 +29,10 @@ func NewFederationAPIServer() *Server {
 	hks := Server{
 		SimpleUsage: "federation-apiserver",
 		Long:        "The API entrypoint for the federation control plane",
-		Run: func(_ *Server, args []string) error {
-			return app.Run(s, wait.NeverStop)
+		Run: func(_ *Server, args []string, stopCh <-chan struct{}) error {
+			return app.Run(s, stopCh)
 		},
+		RespectsStopCh: true,
 	}
 	s.AddFlags(hks.Flags())
 	return &hks

cmd/hyperkube/federation-controller-manager.go

@@ -29,7 +29,7 @@ func NewFederationCMServer() *Server {
 	hks := Server{
 		SimpleUsage: "federation-controller-manager",
 		Long:        "Controller manager for federation control plane. Manages federation service endpoints and controllers",
-		Run: func(_ *Server, args []string) error {
+		Run: func(_ *Server, args []string, stopCh <-chan struct{}) error {
 			return app.Run(s)
 		},
 	}

cmd/hyperkube/hyperkube.go

 /*
-Copyright 2014 The Kubernetes Authors.
+Copyright 2017 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -25,12 +25,14 @@ import (
 	"os"
 	"path"
 
+	"github.com/spf13/pflag"
+
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/apiserver/pkg/server"
 	utilflag "k8s.io/apiserver/pkg/util/flag"
 	"k8s.io/apiserver/pkg/util/logs"
 	utiltemplate "k8s.io/kubernetes/pkg/util/template"
 	"k8s.io/kubernetes/pkg/version/verflag"
-
-	"github.com/spf13/pflag"
 )
 
 // HyperKube represents a single binary that can morph/manage into multiple
@@ -115,7 +117,7 @@ func (hk *HyperKube) Printf(format string, i ...interface{}) {
 }
 
 // Run the server.  This will pick the appropriate server and run it.
-func (hk *HyperKube) Run(args []string) error {
+func (hk *HyperKube) Run(args []string, stopCh <-chan struct{}) error {
 	// If we are called directly, parse all flags up to the first real
 	// argument.  That should be the server to run.
 	command := args[0]
@@ -174,7 +176,22 @@ func (hk *HyperKube) Run(args []string) error {
 	logs.InitLogs()
 	defer logs.FlushLogs()
 
-	err = s.Run(s, s.Flags().Args())
+	if !s.RespectsStopCh {
+		// For commands that do not respect the stopCh, we run them in a go
+		// routine and leave them running when stopCh is closed.
+		errCh := make(chan error)
+		go func() {
+			errCh <- s.Run(s, s.Flags().Args(), wait.NeverStop)
+		}()
+		select {
+		case <-stopCh:
+			return errors.New("interrupted") // This error text is ignored.
+		case err = <-errCh:
+			// fall-through
+		}
+	} else {
+		err = s.Run(s, s.Flags().Args(), stopCh)
+	}
 	if err != nil {
 		hk.Println("Error:", err)
 	}
@@ -184,11 +201,10 @@ func (hk *HyperKube) Run(args []string) error {
 
 // RunToExit will run the hyperkube and then call os.Exit with an appropriate exit code.
 func (hk *HyperKube) RunToExit(args []string) {
-	err := hk.Run(args)
-	if err != nil {
+	stopCh := server.SetupSignalHandler()
+	if err := hk.Run(args, stopCh); err != nil {
 		os.Exit(1)
 	}
-	os.Exit(0)
 }
 
 // Usage will write out a summary for all servers that this binary supports.

cmd/hyperkube/hyperkube_test.go

@@ -22,9 +22,12 @@ import (
 	"fmt"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/spf13/cobra"
 	"github.com/stretchr/testify/assert"
+
+	"k8s.io/apimachinery/pkg/util/wait"
 )
 
 type result struct {
@@ -36,7 +39,7 @@ func testServer(n string) *Server {
 	return &Server{
 		SimpleUsage: n,
 		Long:        fmt.Sprintf("A simple server named %s", n),
-		Run: func(s *Server, args []string) error {
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
 			s.hk.Printf("%s Run\n", s.Name())
 			return nil
 		},
@@ -46,10 +49,45 @@ func testServerError(n string) *Server {
 	return &Server{
 		SimpleUsage: n,
 		Long:        fmt.Sprintf("A simple server named %s that returns an error", n),
-		Run: func(s *Server, args []string) error {
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
+			s.hk.Printf("%s Run\n", s.Name())
+			return errors.New("server returning error")
+		},
+	}
+}
+func testStopChRespectingServer(n string) *Server {
+	return &Server{
+		SimpleUsage: n,
+		Long:        fmt.Sprintf("A simple server named %s", n),
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
+			s.hk.Printf("%s Run\n", s.Name())
+			<-stopCh
+			return nil
+		},
+		RespectsStopCh: true,
+	}
+}
+func testStopChIgnoringServer(n string) *Server {
+	return &Server{
+		SimpleUsage: n,
+		Long:        fmt.Sprintf("A simple server named %s", n),
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
+			<-wait.NeverStop // this leaks obviously, but we don't care about one go routine more or less in test
+			return nil
+		},
+		RespectsStopCh: false,
+	}
+}
+func testStopChRespectingServerWithError(n string) *Server {
+	return &Server{
+		SimpleUsage: n,
+		Long:        fmt.Sprintf("A simple server named %s", n),
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
 			s.hk.Printf("%s Run\n", s.Name())
+			<-stopCh
 			return errors.New("server returning error")
 		},
+		RespectsStopCh: true,
 	}
 }
 
@@ -91,7 +129,7 @@ func testCobraCommand(n string) *Server {
 	s := &Server{
 		SimpleUsage: n,
 		Long:        fmt.Sprintf("A server named %s which uses a cobra command", n),
-		Run: func(s *Server, args []string) error {
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
 			cobraServer = s
 			cmd.SetOutput(s.hk.Out())
 			cmd.SetArgs(args)
@@ -102,7 +140,7 @@ func testCobraCommand(n string) *Server {
 
 	return s
 }
-func runFull(t *testing.T, args string) *result {
+func runFull(t *testing.T, args string, stopCh <-chan struct{}) *result {
 	buf := new(bytes.Buffer)
 	hk := HyperKube{
 		Name: "hyperkube",
@@ -114,11 +152,14 @@ func runFull(t *testing.T, args string) *result {
 	hk.AddServer(testServer("test2"))
 	hk.AddServer(testServer("test3"))
 	hk.AddServer(testServerError("test-error"))
+	hk.AddServer(testStopChIgnoringServer("test-stop-ch-ignoring"))
+	hk.AddServer(testStopChRespectingServer("test-stop-ch-respecting"))
+	hk.AddServer(testStopChRespectingServerWithError("test-error-stop-ch-respecting"))
 	hk.AddServer(testCobraCommand("test-cobra-command"))
 
 	a := strings.Split(args, " ")
 	t.Logf("Running full with args: %q", a)
-	err := hk.Run(a)
+	err := hk.Run(a, stopCh)
 
 	r := &result{err, buf.String()}
 	t.Logf("Result err: %v, output: %q", r.err, r.output)
@@ -127,37 +168,37 @@ func runFull(t *testing.T, args string) *result {
 }
 
 func TestRun(t *testing.T) {
-	x := runFull(t, "hyperkube test1")
+	x := runFull(t, "hyperkube test1", wait.NeverStop)
 	assert.Contains(t, x.output, "test1 Run")
 	assert.NoError(t, x.err)
 }
 
 func TestLinkRun(t *testing.T) {
-	x := runFull(t, "test1")
+	x := runFull(t, "test1", wait.NeverStop)
 	assert.Contains(t, x.output, "test1 Run")
 	assert.NoError(t, x.err)
 }
 
 func TestTopNoArgs(t *testing.T) {
-	x := runFull(t, "hyperkube")
+	x := runFull(t, "hyperkube", wait.NeverStop)
 	assert.EqualError(t, x.err, "no server specified")
 }
 
 func TestBadServer(t *testing.T) {
-	x := runFull(t, "hyperkube bad-server")
+	x := runFull(t, "hyperkube bad-server", wait.NeverStop)
 	assert.EqualError(t, x.err, "Server not found: bad-server")
 	assert.Contains(t, x.output, "Usage")
 }
 
 func TestTopHelp(t *testing.T) {
-	x := runFull(t, "hyperkube --help")
+	x := runFull(t, "hyperkube --help", wait.NeverStop)
 	assert.NoError(t, x.err)
 	assert.Contains(t, x.output, "all-in-one")
 	assert.Contains(t, x.output, "A simple server named test1")
 }
 
 func TestTopFlags(t *testing.T) {
-	x := runFull(t, "hyperkube --help test1")
+	x := runFull(t, "hyperkube --help test1", wait.NeverStop)
 	assert.NoError(t, x.err)
 	assert.Contains(t, x.output, "all-in-one")
 	assert.Contains(t, x.output, "A simple server named test1")
@@ -165,14 +206,14 @@ func TestTopFlags(t *testing.T) {
 }
 
 func TestTopFlagsBad(t *testing.T) {
-	x := runFull(t, "hyperkube --bad-flag")
+	x := runFull(t, "hyperkube --bad-flag", wait.NeverStop)
 	assert.EqualError(t, x.err, "unknown flag: --bad-flag")
 	assert.Contains(t, x.output, "all-in-one")
 	assert.Contains(t, x.output, "A simple server named test1")
 }
 
 func TestServerHelp(t *testing.T) {
-	x := runFull(t, "hyperkube test1 --help")
+	x := runFull(t, "hyperkube test1 --help", wait.NeverStop)
 	assert.NoError(t, x.err)
 	assert.Contains(t, x.output, "A simple server named test1")
 	assert.Contains(t, x.output, "-h, --help")
@@ -181,7 +222,7 @@ func TestServerHelp(t *testing.T) {
 }
 
 func TestServerFlagsBad(t *testing.T) {
-	x := runFull(t, "hyperkube test1 --bad-flag")
+	x := runFull(t, "hyperkube test1 --bad-flag", wait.NeverStop)
 	assert.EqualError(t, x.err, "unknown flag: --bad-flag")
 	assert.Contains(t, x.output, "A simple server named test1")
 	assert.Contains(t, x.output, "-h, --help")
@@ -190,36 +231,91 @@ func TestServerFlagsBad(t *testing.T) {
 }
 
 func TestServerError(t *testing.T) {
-	x := runFull(t, "hyperkube test-error")
+	x := runFull(t, "hyperkube test-error", wait.NeverStop)
 	assert.Contains(t, x.output, "test-error Run")
 	assert.EqualError(t, x.err, "server returning error")
 }
 
+func TestStopChIgnoringServer(t *testing.T) {
+	stopCh := make(chan struct{})
+	returnedCh := make(chan struct{})
+	var x *result
+	go func() {
+		defer close(returnedCh)
+		x = runFull(t, "hyperkube test-stop-ch-ignoring", stopCh)
+	}()
+	close(stopCh)
+	select {
+	case <-time.After(wait.ForeverTestTimeout):
+		t.Fatalf("%q never returned after stopCh was closed", "hyperkube test-stop-ch-ignoring")
+	case <-returnedCh:
+	}
+	// we cannot be sure that the server had a chance to output anything
+	// assert.Contains(t, x.output, "test-error-stop-ch-ignoring Run")
+	assert.EqualError(t, x.err, "interrupted")
+}
+
+func TestStopChRespectingServer(t *testing.T) {
+	stopCh := make(chan struct{})
+	returnedCh := make(chan struct{})
+	var x *result
+	go func() {
+		defer close(returnedCh)
+		x = runFull(t, "hyperkube test-stop-ch-respecting", stopCh)
+	}()
+	close(stopCh)
+	select {
+	case <-time.After(wait.ForeverTestTimeout):
+		t.Fatalf("%q never returned after stopCh was closed", "hyperkube test-stop-ch-respecting")
+	case <-returnedCh:
+	}
+	assert.Contains(t, x.output, "test-stop-ch-respecting Run")
+	assert.Nil(t, x.err)
+}
+
+func TestStopChRespectingServerWithError(t *testing.T) {
+	stopCh := make(chan struct{})
+	returnedCh := make(chan struct{})
+	var x *result
+	go func() {
+		defer close(returnedCh)
+		x = runFull(t, "hyperkube test-error-stop-ch-respecting", stopCh)
+	}()
+	close(stopCh)
+	select {
+	case <-time.After(wait.ForeverTestTimeout):
+		t.Fatalf("%q never returned after stopCh was closed", "hyperkube test-error-stop-ch-respecting")
+	case <-returnedCh:
+	}
+	assert.Contains(t, x.output, "test-error-stop-ch-respecting Run")
+	assert.EqualError(t, x.err, "server returning error")
+}
+
 func TestCobraCommandHelp(t *testing.T) {
-	x := runFull(t, "hyperkube test-cobra-command --help")
+	x := runFull(t, "hyperkube test-cobra-command --help", wait.NeverStop)
 	assert.NoError(t, x.err)
 	assert.Contains(t, x.output, "A server named test-cobra-command which uses a cobra command")
 	assert.Contains(t, x.output, cobraMessageDesc)
 }
 func TestCobraCommandDefaultMessage(t *testing.T) {
-	x := runFull(t, "hyperkube test-cobra-command")
+	x := runFull(t, "hyperkube test-cobra-command", wait.NeverStop)
 	assert.Contains(t, x.output, fmt.Sprintf("msg: %s", defaultCobraMessage))
 }
 func TestCobraCommandMessage(t *testing.T) {
-	x := runFull(t, "hyperkube test-cobra-command --msg foobar")
+	x := runFull(t, "hyperkube test-cobra-command --msg foobar", wait.NeverStop)
 	assert.Contains(t, x.output, "msg: foobar")
 }
 
 func TestCobraSubCommandHelp(t *testing.T) {
-	x := runFull(t, "hyperkube test-cobra-command subcommand --help")
+	x := runFull(t, "hyperkube test-cobra-command subcommand --help", wait.NeverStop)
 	assert.NoError(t, x.err)
 	assert.Contains(t, x.output, cobraSubMessageDesc)
 }
 func TestCobraSubCommandDefaultMessage(t *testing.T) {
-	x := runFull(t, "hyperkube test-cobra-command subcommand")
+	x := runFull(t, "hyperkube test-cobra-command subcommand", wait.NeverStop)
 	assert.Contains(t, x.output, fmt.Sprintf("submsg: %s", defaultCobraSubMessage))
 }
 func TestCobraSubCommandMessage(t *testing.T) {
-	x := runFull(t, "hyperkube test-cobra-command subcommand --submsg foobar")
+	x := runFull(t, "hyperkube test-cobra-command subcommand --submsg foobar", wait.NeverStop)
 	assert.Contains(t, x.output, "submsg: foobar")
 }

cmd/hyperkube/kube-aggregator.go

@@ -19,7 +19,6 @@ package main
 import (
 	"os"
 
-	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/kube-aggregator/pkg/cmd/server"
 )
 
@@ -33,18 +32,19 @@ func NewKubeAggregator() *Server {
 		AlternativeName: "kube-aggregator",
 		SimpleUsage:     "aggregator",
 		Long:            "Aggregator for Kubernetes-style API servers: dynamic registration, discovery summarization, secure proxy.",
-		Run: func(_ *Server, args []string) error {
+		Run: func(_ *Server, args []string, stopCh <-chan struct{}) error {
 			if err := o.Complete(); err != nil {
 				return err
 			}
 			if err := o.Validate(args); err != nil {
 				return err
 			}
-			if err := o.RunAggregator(wait.NeverStop); err != nil {
+			if err := o.RunAggregator(stopCh); err != nil {
 				return err
 			}
 			return nil
 		},
+		RespectsStopCh: true,
 	}
 
 	o.AddFlags(hks.Flags())

cmd/hyperkube/kube-apiserver.go

@@ -17,7 +17,6 @@ limitations under the License.
 package main
 
 import (
-	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
 )
@@ -32,9 +31,10 @@ func NewKubeAPIServer() *Server {
 		AlternativeName: "kube-apiserver",
 		SimpleUsage:     "apiserver",
 		Long:            "The main API entrypoint and interface to the storage system.  The API server is also the focal point for all authorization decisions.",
-		Run: func(_ *Server, args []string) error {
-			return app.Run(s, wait.NeverStop)
+		Run: func(_ *Server, args []string, stopCh <-chan struct{}) error {
+			return app.Run(s, stopCh)
 		},
+		RespectsStopCh: true,
 	}
 	s.AddFlags(hks.Flags())
 	return &hks

cmd/hyperkube/kube-controller-manager.go

@@ -31,7 +31,7 @@ func NewKubeControllerManager() *Server {
 		AlternativeName: "kube-controller-manager",
 		SimpleUsage:     "controller-manager",
 		Long:            "A server that runs a set of active components. This includes replication controllers, service endpoints and nodes.",
-		Run: func(_ *Server, args []string) error {
+		Run: func(_ *Server, args []string, stopCh <-chan struct{}) error {
 			return app.Run(s)
 		},
 	}

cmd/hyperkube/kube-proxy.go

@@ -45,7 +45,7 @@ func NewKubeProxy() *Server {
 	// refactored to use cobra throughout.
 	command.Flags().AddGoFlagSet(flag.CommandLine)
 
-	hks.Run = func(_ *Server, args []string) error {
+	hks.Run = func(_ *Server, args []string, stopCh <-chan struct{}) error {
 		command.SetArgs(args)
 		return command.Execute()
 	}

cmd/hyperkube/kube-scheduler.go

@@ -31,7 +31,7 @@ func NewScheduler() *Server {
 		AlternativeName: "kube-scheduler",
 		SimpleUsage:     "scheduler",
 		Long:            "Implements a Kubernetes scheduler.  This will assign pods to kubelets based on capacity and constraints.",
-		Run: func(_ *Server, _ []string) error {
+		Run: func(_ *Server, _ []string, stopCh <-chan struct{}) error {
 			return app.Run(s)
 		},
 	}

cmd/hyperkube/kubectl.go

@@ -33,7 +33,7 @@ func NewKubectlServer() *Server {
 		name:        "kubectl",
 		SimpleUsage: "Kubernetes command line client",
 		Long:        "Kubernetes command line client",
-		Run: func(s *Server, args []string) error {
+		Run: func(s *Server, args []string, stopCh <-chan struct{}) error {
 			cmd.SetArgs(args)
 			return cmd.Execute()
 		},

cmd/hyperkube/kubelet.go

@@ -38,7 +38,7 @@ func NewKubelet() (*Server, error) {
 		queries Docker to see what is currently running.  It synchronizes the
 		configuration data, with the running set of containers by starting or stopping
 		Docker containers.`,
-		Run: func(_ *Server, _ []string) error {
+		Run: func(_ *Server, _ []string, stopCh <-chan struct{}) error {
 			return app.Run(s, nil)
 		},
 	}

cmd/hyperkube/server.go

@@ -26,7 +26,7 @@ import (
 	"github.com/spf13/pflag"
 )
 
-type serverRunFunc func(s *Server, args []string) error
+type serverRunFunc func(s *Server, args []string, stopCh <-chan struct{}) error
 
 // Server describes a server that this binary can morph into.
 type Server struct {
@@ -34,6 +34,7 @@ type Server struct {
 	Long            string        // Longer free form description of the server
 	Run             serverRunFunc // Run the server.  This is not expected to return.
 	AlternativeName string
+	RespectsStopCh  bool
 
 	flags *pflag.FlagSet // Flags for the command (and all dependents)
 	name  string

cmd/kube-apiserver/BUILD

@@ -29,7 +29,7 @@ go_library(
         "//pkg/version/prometheus:go_default_library",
         "//pkg/version/verflag:go_default_library",
         "//vendor/github.com/spf13/pflag:go_default_library",
-        "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
+        "//vendor/k8s.io/apiserver/pkg/server:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/flag:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/logs:go_default_library",
     ],

cmd/kube-apiserver/apiserver.go

@@ -24,7 +24,9 @@ import (
 	"os"
 	"time"
 
-	"k8s.io/apimachinery/pkg/util/wait"
+	"github.com/spf13/pflag"
+
+	"k8s.io/apiserver/pkg/server"
 	"k8s.io/apiserver/pkg/util/flag"
 	"k8s.io/apiserver/pkg/util/logs"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app"
@@ -32,8 +34,6 @@ import (
 	_ "k8s.io/kubernetes/pkg/client/metrics/prometheus" // for client metric registration
 	_ "k8s.io/kubernetes/pkg/version/prometheus"        // for version metric registration
 	"k8s.io/kubernetes/pkg/version/verflag"
-
-	"github.com/spf13/pflag"
 )
 
 func main() {
@@ -48,7 +48,8 @@ func main() {
 
 	verflag.PrintAndExitIfRequested()
 
-	if err := app.Run(s, wait.NeverStop); err != nil {
+	stopCh := server.SetupSignalHandler()
+	if err := app.Run(s, stopCh); err != nil {
 		fmt.Fprintf(os.Stderr, "%v\n", err)
 		os.Exit(1)
 	}

staging/src/k8s.io/apiextensions-apiserver/BUILD

@@ -15,8 +15,9 @@ go_library(
     name = "go_default_library",
     srcs = ["main.go"],
     deps = [
+        "//vendor/github.com/golang/glog:go_default_library",
         "//vendor/k8s.io/apiextensions-apiserver/pkg/cmd/server:go_default_library",
-        "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
+        "//vendor/k8s.io/apiserver/pkg/server:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/logs:go_default_library",
     ],
 )

staging/src/k8s.io/apiextensions-apiserver/main.go

@@ -21,8 +21,10 @@ import (
 	"os"
 	"runtime"
 
+	"github.com/golang/glog"
+
 	"k8s.io/apiextensions-apiserver/pkg/cmd/server"
-	"k8s.io/apimachinery/pkg/util/wait"
+	genericapiserver "k8s.io/apiserver/pkg/server"
 	"k8s.io/apiserver/pkg/util/logs"
 )
 
@@ -34,9 +36,10 @@ func main() {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 	}
 
-	cmd := server.NewCommandStartCustomResourceDefinitionsServer(os.Stdout, os.Stderr, wait.NeverStop)
+	stopCh := genericapiserver.SetupSignalHandler()
+	cmd := server.NewCommandStartCustomResourceDefinitionsServer(os.Stdout, os.Stderr, stopCh)
 	cmd.Flags().AddGoFlagSet(flag.CommandLine)
 	if err := cmd.Execute(); err != nil {
-		panic(err)
+		glog.Fatal(err)
 	}
 }

staging/src/k8s.io/apiserver/pkg/audit/types.go

@@ -34,4 +34,8 @@ type Backend interface {
 	// Run will initialize the backend. It must not block, but may run go routines in the background. If
 	// stopCh is closed, it is supposed to stop them. Run will be called before the first call to ProcessEvents.
 	Run(stopCh <-chan struct{}) error
+
+	// Shutdown will synchronously shut down the backend while making sure that all pending
+	// events are delivered.
+	Shutdown()
 }

staging/src/k8s.io/apiserver/pkg/audit/union.go

@@ -49,3 +49,9 @@ func (u union) Run(stopCh <-chan struct{}) error {
 	}
 	return errors.AggregateGoroutines(funcs...)
 }
+
+func (u union) Shutdown() {
+	for _, backend := range u.backends {
+		backend.Shutdown()
+	}
+}

staging/src/k8s.io/apiserver/pkg/audit/union_test.go

@@ -36,6 +36,10 @@ func (f *fakeBackend) Run(stopCh <-chan struct{}) error {
 	return nil
 }
 
+func (u *fakeBackend) Shutdown() {
+	// nothing to do here
+}
+
 func TestUnion(t *testing.T) {
 	backends := []Backend{
 		new(fakeBackend),

staging/src/k8s.io/apiserver/pkg/server/BUILD

@@ -52,7 +52,14 @@ go_library(
         "hooks.go",
         "plugins.go",
         "serve.go",
-    ],
+        "signal.go",
+        "signal_posix.go",
+    ] + select({
+        "@io_bazel_rules_go//go/platform:windows_amd64": [
+            "signal_windows.go",
+        ],
+        "//conditions:default": [],
+    }),
     deps = [
         "//vendor/github.com/coreos/go-systemd/daemon:go_default_library",
         "//vendor/github.com/emicklei/go-restful:go_default_library",

staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go

@@ -246,6 +246,11 @@ func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
 	}
 
 	<-stopCh
+
+	if s.GenericAPIServer.AuditBackend != nil {
+		s.GenericAPIServer.AuditBackend.Shutdown()
+	}
+
 	return nil
 }
 

staging/src/k8s.io/apiserver/pkg/server/signal.go

+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package server
+
+import (
+	"os"
+	"os/signal"
+)
+
+var onlyOneSignalHandler = make(chan struct{})
+
+// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
+// which is closed on one of these signals. If a second signal is caught, the program
+// is terminated with exit code 1.
+func SetupSignalHandler() (stopCh <-chan struct{}) {
+	close(onlyOneSignalHandler) // panics when called twice
+
+	stop := make(chan struct{})
+	c := make(chan os.Signal, 2)
+	signal.Notify(c, shutdownSignals...)
+	go func() {
+		<-c
+		close(stop)
+		<-c
+		os.Exit(1) // second signal. Exit directly.
+	}()
+
+	return stop
+}

staging/src/k8s.io/apiserver/pkg/server/signal_posix.go

+// +build !windows
+
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package server
+
+import (
+	"os"
+	"syscall"
+)
+
+var shutdownSignals = []os.Signal{os.Interrupt, syscall.SIGTERM}

staging/src/k8s.io/apiserver/pkg/server/signal_windows.go

+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package server
+
+import (
+	"os"
+)
+
+var shutdownSignals = []os.Signal{os.Interrupt}

staging/src/k8s.io/apiserver/plugin/pkg/audit/log/backend.go

@@ -85,3 +85,7 @@ func (b *backend) logEvent(ev *auditinternal.Event) {
 func (b *backend) Run(stopCh <-chan struct{}) error {
 	return nil
 }
+
+func (u *backend) Shutdown() {
+	// nothing to do here
+}

staging/src/k8s.io/apiserver/plugin/pkg/audit/webhook/webhook.go

@@ -117,6 +117,10 @@ func (b *blockingBackend) Run(stopCh <-chan struct{}) error {
 	return nil
 }
 
+func (b *blockingBackend) Shutdown() {
+	// nothing to do here
+}
+
 func (b *blockingBackend) ProcessEvents(ev ...*auditinternal.Event) {
 	if err := b.processEvents(ev...); err != nil {
 		audit.HandlePluginError(pluginName, err, ev...)
@@ -203,6 +207,10 @@ func (b *batchBackend) Run(stopCh <-chan struct{}) error {
 	return nil
 }
 
+func (b *batchBackend) Shutdown() {
+	// TODO: send out batched events
+}
+
 // sendBatchEvents attempts to batch some number of events to the backend. It POSTs events
 // in a goroutine and logging any error encountered during the POST.
 //

staging/src/k8s.io/kube-aggregator/BUILD

@@ -23,7 +23,8 @@ go_library(
     name = "go_default_library",
     srcs = ["main.go"],
     deps = [
-        "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/k8s.io/apiserver/pkg/server:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/logs:go_default_library",
         "//vendor/k8s.io/kube-aggregator/pkg/apis/apiregistration/install:go_default_library",
         "//vendor/k8s.io/kube-aggregator/pkg/apis/apiregistration/validation:go_default_library",

staging/src/k8s.io/kube-aggregator/main.go

@@ -21,7 +21,9 @@ import (
 	"os"
 	"runtime"
 
-	"k8s.io/apimachinery/pkg/util/wait"
+	"github.com/golang/glog"
+
+	genericapiserver "k8s.io/apiserver/pkg/server"
 	"k8s.io/apiserver/pkg/util/logs"
 	"k8s.io/kube-aggregator/pkg/cmd/server"
 
@@ -41,9 +43,10 @@ func main() {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 	}
 
-	cmd := server.NewCommandStartAggregator(os.Stdout, os.Stderr, wait.NeverStop)
+	stopCh := genericapiserver.SetupSignalHandler()
+	cmd := server.NewCommandStartAggregator(os.Stdout, os.Stderr, stopCh)
 	cmd.Flags().AddGoFlagSet(flag.CommandLine)
 	if err := cmd.Execute(); err != nil {
-		panic(err)
+		glog.Fatal(err)
 	}
 }

staging/src/k8s.io/kube-gen/cmd/go-to-protobuf/protobuf/tags.go

@@ -27,7 +27,7 @@ import (
 func extractBoolTagOrDie(key string, lines []string) bool {
 	val, err := types.ExtractSingleBoolCommentTag("+", key, false, lines)
 	if err != nil {
-		glog.Fatalf(err.Error())
+		glog.Fatal(err)
 	}
 	return val
 }

staging/src/k8s.io/kube-gen/cmd/informer-gen/generators/tags.go

@@ -27,7 +27,7 @@ import (
 func extractBoolTagOrDie(key string, lines []string) bool {
 	val, err := types.ExtractSingleBoolCommentTag("+", key, false, lines)
 	if err != nil {
-		glog.Fatalf(err.Error())
+		glog.Fatal(err)
 	}
 	return val
 }

staging/src/k8s.io/kube-gen/cmd/lister-gen/generators/tags.go

@@ -27,7 +27,7 @@ import (
 func extractBoolTagOrDie(key string, lines []string) bool {
 	val, err := types.ExtractSingleBoolCommentTag("+", key, false, lines)
 	if err != nil {
-		glog.Fatalf(err.Error())
+		glog.Fatal(err)
 	}
 	return val
 }

staging/src/k8s.io/sample-apiserver/BUILD

@@ -15,7 +15,8 @@ go_library(
     name = "go_default_library",
     srcs = ["main.go"],
     deps = [
-        "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/k8s.io/apiserver/pkg/server:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/logs:go_default_library",
         "//vendor/k8s.io/sample-apiserver/pkg/cmd/server:go_default_library",
     ],

staging/src/k8s.io/sample-apiserver/main.go

@@ -21,7 +21,9 @@ import (
 	"os"
 	"runtime"
 
-	"k8s.io/apimachinery/pkg/util/wait"
+	"github.com/golang/glog"
+
+	genericapiserver "k8s.io/apiserver/pkg/server"
 	"k8s.io/apiserver/pkg/util/logs"
 	"k8s.io/sample-apiserver/pkg/cmd/server"
 )
@@ -34,9 +36,10 @@ func main() {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 	}
 
-	cmd := server.NewCommandStartWardleServer(os.Stdout, os.Stderr, wait.NeverStop)
+	stopCh := genericapiserver.SetupSignalHandler()
+	cmd := server.NewCommandStartWardleServer(os.Stdout, os.Stderr, stopCh)
 	cmd.Flags().AddGoFlagSet(flag.CommandLine)
 	if err := cmd.Execute(); err != nil {
-		panic(err)
+		glog.Fatal(err)
 	}
 }