Add test for kube-scheduler command setup

cmd/kube-scheduler/app/BUILD

@@ -3,6 +3,7 @@ package(default_visibility = ["//visibility:public"])
 load(
     "@io_bazel_rules_go//go:def.bzl",
     "go_library",
+    "go_test",
 )
 
 go_library(
@@ -65,3 +66,15 @@ filegroup(
     ],
     tags = ["automanaged"],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["server_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//cmd/kube-scheduler/app/options:go_default_library",
+        "//pkg/scheduler/apis/config:go_default_library",
+        "//vendor/github.com/google/go-cmp/cmp:go_default_library",
+        "//vendor/github.com/spf13/pflag:go_default_library",
+    ],
+)

cmd/kube-scheduler/app/server.go

@@ -119,33 +119,29 @@ func runCommand(cmd *cobra.Command, args []string, opts *options.Options, regist
 	verflag.PrintAndExitIfRequested()
 	utilflag.PrintFlags(cmd.Flags())
 
-	if len(args) != 0 {
-		fmt.Fprint(os.Stderr, "arguments are not supported\n")
-	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
 
-	if errs := opts.Validate(); len(errs) > 0 {
-		return utilerrors.NewAggregate(errs)
+	cc, sched, err := Setup(ctx, args, opts, registryOptions...)
+	if err != nil {
+		return err
 	}
 
 	if len(opts.WriteConfigTo) > 0 {
-		c := &schedulerserverconfig.Config{}
-		if err := opts.ApplyTo(c); err != nil {
-			return err
-		}
-		if err := options.WriteConfigFile(opts.WriteConfigTo, &c.ComponentConfig); err != nil {
+		if err := options.WriteConfigFile(opts.WriteConfigTo, &cc.ComponentConfig); err != nil {
 			return err
 		}
 		klog.Infof("Wrote configuration to: %s\n", opts.WriteConfigTo)
 		return nil
 	}
 
-	c, err := opts.Config()
-	if err != nil {
-		return err
-	}
+	return Run(ctx, cc, sched)
+}
 
-	// Get the completed config
-	cc := c.Complete()
+// Run executes the scheduler based on the given configuration. It only returns on error or when context is done.
+func Run(ctx context.Context, cc *schedulerserverconfig.CompletedConfig, sched *scheduler.Scheduler) error {
+	// To help debugging, immediately log version
+	klog.V(1).Infof("Starting Kubernetes Scheduler version %+v", version.Get())
 
 	// Configz registration.
 	if cz, err := configz.New("componentconfig"); err == nil {
@@ -154,45 +150,6 @@ func runCommand(cmd *cobra.Command, args []string, opts *options.Options, regist
 		return fmt.Errorf("unable to register configz: %s", err)
 	}
 
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	return Run(ctx, cc, registryOptions...)
-}
-
-// Run executes the scheduler based on the given configuration. It only returns on error or when context is done.
-func Run(ctx context.Context, cc schedulerserverconfig.CompletedConfig, outOfTreeRegistryOptions ...Option) error {
-	// To help debugging, immediately log version
-	klog.V(1).Infof("Starting Kubernetes Scheduler version %+v", version.Get())
-
-	outOfTreeRegistry := make(framework.Registry)
-	for _, option := range outOfTreeRegistryOptions {
-		if err := option(outOfTreeRegistry); err != nil {
-			return err
-		}
-	}
-
-	recorderFactory := getRecorderFactory(&cc)
-	// Create the scheduler.
-	sched, err := scheduler.New(cc.Client,
-		cc.InformerFactory,
-		cc.PodInformer,
-		recorderFactory,
-		ctx.Done(),
-		scheduler.WithProfiles(cc.ComponentConfig.Profiles...),
-		scheduler.WithAlgorithmSource(cc.ComponentConfig.AlgorithmSource),
-		scheduler.WithPreemptionDisabled(cc.ComponentConfig.DisablePreemption),
-		scheduler.WithPercentageOfNodesToScore(cc.ComponentConfig.PercentageOfNodesToScore),
-		scheduler.WithBindTimeoutSeconds(cc.ComponentConfig.BindTimeoutSeconds),
-		scheduler.WithFrameworkOutOfTreeRegistry(outOfTreeRegistry),
-		scheduler.WithPodMaxBackoffSeconds(cc.ComponentConfig.PodMaxBackoffSeconds),
-		scheduler.WithPodInitialBackoffSeconds(cc.ComponentConfig.PodInitialBackoffSeconds),
-		scheduler.WithExtenders(cc.ComponentConfig.Extenders...),
-	)
-	if err != nil {
-		return err
-	}
-
 	// Prepare the event broadcaster.
 	if cc.Broadcaster != nil && cc.EventClient != nil {
 		cc.Broadcaster.StartRecordingToSink(ctx.Done())
@@ -340,3 +297,52 @@ func WithPlugin(name string, factory framework.PluginFactory) Option {
 		return registry.Register(name, factory)
 	}
 }
+
+// Setup creates a completed config and a scheduler based on the command args and options
+func Setup(ctx context.Context, args []string, opts *options.Options, outOfTreeRegistryOptions ...Option) (*schedulerserverconfig.CompletedConfig, *scheduler.Scheduler, error) {
+	if len(args) != 0 {
+		fmt.Fprint(os.Stderr, "arguments are not supported\n")
+	}
+
+	if errs := opts.Validate(); len(errs) > 0 {
+		return nil, nil, utilerrors.NewAggregate(errs)
+	}
+
+	c, err := opts.Config()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Get the completed config
+	cc := c.Complete()
+
+	outOfTreeRegistry := make(framework.Registry)
+	for _, option := range outOfTreeRegistryOptions {
+		if err := option(outOfTreeRegistry); err != nil {
+			return nil, nil, err
+		}
+	}
+
+	recorderFactory := getRecorderFactory(&cc)
+	// Create the scheduler.
+	sched, err := scheduler.New(cc.Client,
+		cc.InformerFactory,
+		cc.PodInformer,
+		recorderFactory,
+		ctx.Done(),
+		scheduler.WithProfiles(cc.ComponentConfig.Profiles...),
+		scheduler.WithAlgorithmSource(cc.ComponentConfig.AlgorithmSource),
+		scheduler.WithPreemptionDisabled(cc.ComponentConfig.DisablePreemption),
+		scheduler.WithPercentageOfNodesToScore(cc.ComponentConfig.PercentageOfNodesToScore),
+		scheduler.WithBindTimeoutSeconds(cc.ComponentConfig.BindTimeoutSeconds),
+		scheduler.WithFrameworkOutOfTreeRegistry(outOfTreeRegistry),
+		scheduler.WithPodMaxBackoffSeconds(cc.ComponentConfig.PodMaxBackoffSeconds),
+		scheduler.WithPodInitialBackoffSeconds(cc.ComponentConfig.PodInitialBackoffSeconds),
+		scheduler.WithExtenders(cc.ComponentConfig.Extenders...),
+	)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return &cc, sched, nil
+}

cmd/kube-scheduler/app/server_test.go

@@ -0,0 +1,298 @@
+/*
+Copyright 2020 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 app
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/spf13/pflag"
+	"k8s.io/kubernetes/cmd/kube-scheduler/app/options"
+	kubeschedulerconfig "k8s.io/kubernetes/pkg/scheduler/apis/config"
+)
+
+func TestSetup(t *testing.T) {
+	// temp dir
+	tmpDir, err := ioutil.TempDir("", "scheduler-options")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	// https server
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		w.WriteHeader(200)
+		w.Write([]byte(`ok`))
+	}))
+	defer server.Close()
+
+	configKubeconfig := filepath.Join(tmpDir, "config.kubeconfig")
+	if err := ioutil.WriteFile(configKubeconfig, []byte(fmt.Sprintf(`
+apiVersion: v1
+kind: Config
+clusters:
+- cluster:
+    insecure-skip-tls-verify: true
+    server: %s
+  name: default
+contexts:
+- context:
+    cluster: default
+    user: default
+  name: default
+current-context: default
+users:
+- name: default
+  user:
+    username: config
+`, server.URL)), os.FileMode(0600)); err != nil {
+		t.Fatal(err)
+	}
+
+	v1alpha1Config := filepath.Join(tmpDir, "kubeconfig_v1alpha1.yaml")
+	if err := ioutil.WriteFile(v1alpha1Config, []byte(fmt.Sprintf(`
+apiVersion: kubescheduler.config.k8s.io/v1alpha1
+kind: KubeSchedulerConfiguration
+schedulerName: "my-old-scheduler"
+clientConnection:
+  kubeconfig: "%s"
+leaderElection:
+  leaderElect: true
+hardPodAffinitySymmetricWeight: 3`, configKubeconfig)), os.FileMode(0600)); err != nil {
+		t.Fatal(err)
+	}
+
+	// plugin config
+	pluginConfigFile := filepath.Join(tmpDir, "plugin.yaml")
+	if err := ioutil.WriteFile(pluginConfigFile, []byte(fmt.Sprintf(`
+apiVersion: kubescheduler.config.k8s.io/v1alpha2
+kind: KubeSchedulerConfiguration
+clientConnection:
+  kubeconfig: "%s"
+profiles:
+- plugins:
+    preFilter:
+      enabled:
+      - name: NodeResourcesFit
+      - name: NodePorts
+      disabled:
+      - name: "*"
+    filter:
+      enabled:
+      - name: NodeResourcesFit
+      - name: NodePorts
+      disabled:
+      - name: "*"
+    preScore:
+      enabled:
+      - name: InterPodAffinity
+      - name: TaintToleration
+      disabled:
+      - name: "*"
+    score:
+      enabled:
+      - name: InterPodAffinity
+      - name: TaintToleration
+      disabled:
+      - name: "*"
+`, configKubeconfig)), os.FileMode(0600)); err != nil {
+		t.Fatal(err)
+	}
+
+	// multiple profiles config
+	multiProfilesConfig := filepath.Join(tmpDir, "multi-profiles.yaml")
+	if err := ioutil.WriteFile(multiProfilesConfig, []byte(fmt.Sprintf(`
+apiVersion: kubescheduler.config.k8s.io/v1alpha2
+kind: KubeSchedulerConfiguration
+clientConnection:
+  kubeconfig: "%s"
+profiles:
+- schedulerName: "profile-default-plugins"
+- schedulerName: "profile-disable-all-filter-and-score-plugins"
+  plugins:
+    preFilter:
+      disabled:
+      - name: "*"
+    filter:
+      disabled:
+      - name: "*"
+    preScore:
+      disabled:
+      - name: "*"
+    score:
+      disabled:
+      - name: "*"
+`, configKubeconfig)), os.FileMode(0600)); err != nil {
+		t.Fatal(err)
+	}
+
+	defaultPlugins := map[string][]kubeschedulerconfig.Plugin{
+		"QueueSortPlugin": {
+			{Name: "PrioritySort"},
+		},
+		"PreFilterPlugin": {
+			{Name: "NodeResourcesFit"},
+			{Name: "NodePorts"},
+			{Name: "InterPodAffinity"},
+			{Name: "PodTopologySpread"},
+		},
+		"FilterPlugin": {
+			{Name: "NodeUnschedulable"},
+			{Name: "NodeResourcesFit"},
+			{Name: "NodeName"},
+			{Name: "NodePorts"},
+			{Name: "NodeAffinity"},
+			{Name: "VolumeRestrictions"},
+			{Name: "TaintToleration"},
+			{Name: "EBSLimits"},
+			{Name: "GCEPDLimits"},
+			{Name: "NodeVolumeLimits"},
+			{Name: "AzureDiskLimits"},
+			{Name: "VolumeBinding"},
+			{Name: "VolumeZone"},
+			{Name: "InterPodAffinity"},
+			{Name: "PodTopologySpread"},
+		},
+		"PreScorePlugin": {
+			{Name: "InterPodAffinity"},
+			{Name: "DefaultPodTopologySpread"},
+			{Name: "TaintToleration"},
+			{Name: "PodTopologySpread"},
+		},
+		"ScorePlugin": {
+			{Name: "NodeResourcesBalancedAllocation", Weight: 1},
+			{Name: "ImageLocality", Weight: 1},
+			{Name: "InterPodAffinity", Weight: 1},
+			{Name: "NodeResourcesLeastAllocated", Weight: 1},
+			{Name: "NodeAffinity", Weight: 1},
+			{Name: "NodePreferAvoidPods", Weight: 10000},
+			{Name: "DefaultPodTopologySpread", Weight: 1},
+			{Name: "TaintToleration", Weight: 1},
+			{Name: "PodTopologySpread", Weight: 1},
+		},
+		"BindPlugin": {{Name: "DefaultBinder"}},
+	}
+
+	testcases := []struct {
+		name        string
+		flags       []string
+		wantPlugins map[string]map[string][]kubeschedulerconfig.Plugin
+	}{
+		{
+			name: "default config",
+			flags: []string{
+				"--kubeconfig", configKubeconfig,
+			},
+			wantPlugins: map[string]map[string][]kubeschedulerconfig.Plugin{
+				"default-scheduler": defaultPlugins,
+			},
+		},
+		{
+			name: "v1alpha1 config with SchedulerName and HardPodAffinitySymmetricWeight",
+			flags: []string{
+				"--config", v1alpha1Config,
+				"--kubeconfig", configKubeconfig,
+			},
+			wantPlugins: map[string]map[string][]kubeschedulerconfig.Plugin{
+				"my-old-scheduler": defaultPlugins,
+			},
+		},
+		{
+			name: "plugin config with single profile",
+			flags: []string{
+				"--config", pluginConfigFile,
+				"--kubeconfig", configKubeconfig,
+			},
+			wantPlugins: map[string]map[string][]kubeschedulerconfig.Plugin{
+				"default-scheduler": {
+					"BindPlugin":      {{Name: "DefaultBinder"}},
+					"FilterPlugin":    {{Name: "NodeResourcesFit"}, {Name: "NodePorts"}},
+					"PreFilterPlugin": {{Name: "NodeResourcesFit"}, {Name: "NodePorts"}},
+					"PreScorePlugin":  {{Name: "InterPodAffinity"}, {Name: "TaintToleration"}},
+					"QueueSortPlugin": {{Name: "PrioritySort"}},
+					"ScorePlugin":     {{Name: "InterPodAffinity", Weight: 1}, {Name: "TaintToleration", Weight: 1}},
+				},
+			},
+		},
+		{
+			name: "plugin config with multiple profiles",
+			flags: []string{
+				"--config", multiProfilesConfig,
+				"--kubeconfig", configKubeconfig,
+			},
+			wantPlugins: map[string]map[string][]kubeschedulerconfig.Plugin{
+				"profile-default-plugins": defaultPlugins,
+				"profile-disable-all-filter-and-score-plugins": {
+					"BindPlugin":      {{Name: "DefaultBinder"}},
+					"QueueSortPlugin": {{Name: "PrioritySort"}},
+				},
+			},
+		},
+		{
+			name: "Deprecated SchedulerName flag",
+			flags: []string{
+				"--kubeconfig", configKubeconfig,
+				"--scheduler-name", "my-scheduler",
+			},
+			wantPlugins: map[string]map[string][]kubeschedulerconfig.Plugin{
+				"my-scheduler": defaultPlugins,
+			},
+		},
+	}
+
+	for _, tc := range testcases {
+		t.Run(tc.name, func(t *testing.T) {
+			fs := pflag.NewFlagSet("test", pflag.PanicOnError)
+			opts, err := options.NewOptions()
+			if err != nil {
+				t.Fatal(err)
+			}
+			for _, f := range opts.Flags().FlagSets {
+				fs.AddFlagSet(f)
+			}
+			if err := fs.Parse(tc.flags); err != nil {
+				t.Fatal(err)
+			}
+
+			var args []string
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			cc, sched, err := Setup(ctx, args, opts)
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer cc.SecureServing.Listener.Close()
+			defer cc.InsecureServing.Listener.Close()
+
+			gotPlugins := make(map[string]map[string][]kubeschedulerconfig.Plugin)
+			for n, p := range sched.Profiles {
+				gotPlugins[n] = p.ListPlugins()
+			}
+
+			if diff := cmp.Diff(tc.wantPlugins, gotPlugins); diff != "" {
+				t.Errorf("unexpected plugins diff (-want, +got): %s", diff)
+			}
+		})
+	}
+}

cmd/kube-scheduler/app/testing/BUILD

@@ -9,6 +9,7 @@ go_library(
         "//cmd/kube-scheduler/app:go_default_library",
         "//cmd/kube-scheduler/app/config:go_default_library",
         "//cmd/kube-scheduler/app/options:go_default_library",
+        "//pkg/util/configz:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",
         "//staging/src/k8s.io/client-go/rest:go_default_library",

cmd/kube-scheduler/app/testing/testserver.go

@@ -32,6 +32,7 @@ import (
 	"k8s.io/kubernetes/cmd/kube-scheduler/app"
 	kubeschedulerconfig "k8s.io/kubernetes/cmd/kube-scheduler/app/config"
 	"k8s.io/kubernetes/cmd/kube-scheduler/app/options"
+	"k8s.io/kubernetes/pkg/util/configz"
 )
 
 // TearDownFunc is to be called to tear down a test server.
@@ -66,6 +67,7 @@ func StartTestServer(t Logger, customFlags []string) (result TestServer, err err
 		if len(result.TmpDir) != 0 {
 			os.RemoveAll(result.TmpDir)
 		}
+		configz.Delete("componentconfig")
 	}
 	defer func() {
 		if result.TearDownFn == nil {
@@ -80,51 +82,52 @@ func StartTestServer(t Logger, customFlags []string) (result TestServer, err err
 
 	fs := pflag.NewFlagSet("test", pflag.PanicOnError)
 
-	s, err := options.NewOptions()
+	opts, err := options.NewOptions()
 	if err != nil {
 		return TestServer{}, err
 	}
-	namedFlagSets := s.Flags()
+	namedFlagSets := opts.Flags()
 	for _, f := range namedFlagSets.FlagSets {
 		fs.AddFlagSet(f)
 	}
 
 	fs.Parse(customFlags)
 
-	if s.SecureServing.BindPort != 0 {
-		s.SecureServing.Listener, s.SecureServing.BindPort, err = createListenerOnFreePort()
+	if opts.SecureServing.BindPort != 0 {
+		opts.SecureServing.Listener, opts.SecureServing.BindPort, err = createListenerOnFreePort()
 		if err != nil {
 			return result, fmt.Errorf("failed to create listener: %v", err)
 		}
-		s.SecureServing.ServerCert.CertDirectory = result.TmpDir
+		opts.SecureServing.ServerCert.CertDirectory = result.TmpDir
 
-		t.Logf("kube-scheduler will listen securely on port %d...", s.SecureServing.BindPort)
+		t.Logf("kube-scheduler will listen securely on port %d...", opts.SecureServing.BindPort)
 	}
 
-	if s.CombinedInsecureServing.BindPort != 0 {
+	if opts.CombinedInsecureServing.BindPort != 0 {
 		listener, port, err := createListenerOnFreePort()
 		if err != nil {
 			return result, fmt.Errorf("failed to create listener: %v", err)
 		}
-		s.CombinedInsecureServing.BindPort = port
-		s.CombinedInsecureServing.Healthz.Listener = listener
-		s.CombinedInsecureServing.Metrics.Listener = listener
-		t.Logf("kube-scheduler will listen insecurely on port %d...", s.CombinedInsecureServing.BindPort)
+		opts.CombinedInsecureServing.BindPort = port
+		opts.CombinedInsecureServing.Healthz.Listener = listener
+		opts.CombinedInsecureServing.Metrics.Listener = listener
+		t.Logf("kube-scheduler will listen insecurely on port %d...", opts.CombinedInsecureServing.BindPort)
 	}
-	config, err := s.Config()
+
+	cc, sched, err := app.Setup(ctx, []string{}, opts)
 	if err != nil {
 		return result, fmt.Errorf("failed to create config from options: %v", err)
 	}
 
 	errCh := make(chan error)
 	go func(ctx context.Context) {
-		if err := app.Run(ctx, config.Complete()); err != nil {
+		if err := app.Run(ctx, cc, sched); err != nil {
 			errCh <- err
 		}
 	}(ctx)
 
 	t.Logf("Waiting for /healthz to be ok...")
-	client, err := kubernetes.NewForConfig(config.LoopbackClientConfig)
+	client, err := kubernetes.NewForConfig(cc.LoopbackClientConfig)
 	if err != nil {
 		return result, fmt.Errorf("failed to create a client: %v", err)
 	}
@@ -148,9 +151,9 @@ func StartTestServer(t Logger, customFlags []string) (result TestServer, err err
 	}
 
 	// from here the caller must call tearDown
-	result.LoopbackClientConfig = config.LoopbackClientConfig
-	result.Options = s
-	result.Config = config
+	result.LoopbackClientConfig = cc.LoopbackClientConfig
+	result.Options = opts
+	result.Config = cc.Config
 	result.TearDownFn = tearDown
 
 	return result, nil