Add run kubelet mode.

hack/verify-flags/known-flags.txt

@@ -525,6 +525,7 @@ rkt-stage1-image
 root-ca-file
 root-dir
 route-reconciliation-period
+run-kubelet-mode
 run-proxy
 run-services-mode
 runtime-cgroups

test/e2e_node/e2e_node_suite_test.go

@@ -51,6 +51,7 @@ var e2es *services.E2EServices
 
 // TODO(random-liu): Change the following modes to sub-command.
 var runServicesMode = flag.Bool("run-services-mode", false, "If true, only run services (etcd, apiserver) in current process, and not run test.")
+var runKubeletMode = flag.Bool("run-kubelet-mode", false, "If true, only start kubelet, and not run test.")
 var systemValidateMode = flag.Bool("system-validate-mode", false, "If true, only run system validation in current process, and not run test.")
 
 func init() {
@@ -81,6 +82,11 @@ func TestE2eNode(t *testing.T) {
 		services.RunE2EServices()
 		return
 	}
+	if *runKubeletMode {
+		// If run-kubelet-mode is specified, only start kubelet.
+		services.RunKubelet()
+		return
+	}
 	if *systemValidateMode {
 		// If system-validate-mode is specified, only run system validation in current process.
 		if framework.TestContext.NodeConformance {

test/e2e_node/services/internal_services.go

@@ -19,8 +19,6 @@ package services
 import (
 	"io/ioutil"
 	"os"
-	"os/signal"
-	"syscall"
 
 	"github.com/golang/glog"
 )
@@ -38,10 +36,6 @@ func newE2EServices() *e2eServices {
 	return &e2eServices{}
 }
 
-// terminationSignals are signals that cause the program to exit in the
-// supported platforms (linux, darwin, windows).
-var terminationSignals = []os.Signal{syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT}
-
 // run starts all e2e services and wait for the termination signal. Once receives the
 // termination signal, it will stop the e2e services gracefully.
 func (es *e2eServices) run() error {
@@ -50,9 +44,7 @@ func (es *e2eServices) run() error {
 		return err
 	}
 	// Wait until receiving a termination signal.
-	sig := make(chan os.Signal, 1)
-	signal.Notify(sig, terminationSignals...)
-	<-sig
+	waitForTerminationSignal()
 	return nil
 }
 

test/e2e_node/services/kubelet.go

@@ -63,6 +63,22 @@ func init() {
 	flag.Var(&kubeletArgs, "kubelet-flags", "Kubelet flags passed to kubelet, this will override default kubelet flags in the test. Flags specified in multiple kubelet-flags will be concatenate.")
 }
 
+// RunKubelet starts kubelet and waits for termination signal. Once receives the
+// termination signal, it will stop the kubelet gracefully.
+func RunKubelet() {
+	var err error
+	// Enable monitorParent to make sure kubelet will receive termination signal
+	// when test process exits.
+	e := NewE2EServices(true /* monitorParent */)
+	defer e.Stop()
+	e.kubelet, err = e.startKubelet()
+	if err != nil {
+		glog.Fatalf("Failed to start kubelet: %v", err)
+	}
+	// Wait until receiving a termination signal.
+	waitForTerminationSignal()
+}
+
 const (
 	// Ports of different e2e services.
 	kubeletPort         = "10250"

test/e2e_node/services/util.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2016 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 services
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+// terminationSignals are signals that cause the program to exit in the
+// supported platforms (linux, darwin, windows).
+var terminationSignals = []os.Signal{syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT}
+
+// waitForTerminationSignal waits for termination signal.
+func waitForTerminationSignal() {
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, terminationSignals...)
+	<-sig
+}