Add --disable-optimizations flag

cmd/minikube/cmd/start_flags.go

@@ -133,6 +133,7 @@ const (
 	extraDisks              = "extra-disks"
 	certExpiration          = "cert-expiration"
 	binaryMirror            = "binary-mirror"
+	disableOptimizations    = "disable-optimizations"
 )
 
 var (
@@ -191,6 +192,7 @@ func initMinikubeFlags() {
 	startCmd.Flags().Int(extraDisks, 0, "Number of extra disks created and attached to the minikube VM (currently only implemented for hyperkit and kvm2 drivers)")
 	startCmd.Flags().Duration(certExpiration, constants.DefaultCertExpiration, "Duration until minikube certificate expiration, defaults to three years (26280h).")
 	startCmd.Flags().String(binaryMirror, "", "Location to fetch kubectl, kubelet, & kubeadm binaries from.")
+	startCmd.Flags().Bool(disableOptimizations, false, "If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.")
 }
 
 // initKubernetesFlags inits the commandline flags for Kubernetes related options
@@ -379,6 +381,27 @@ func getDiskSize() int {
 	return diskSize
 }
 
+func getExtraOptions() config.ExtraOptionSlice {
+	options := []string{}
+	if detect.IsCloudShell() {
+		options = append(options, "kubelet.cgroups-per-qos=false", "kubelet.enforce-node-allocatable=\"\"")
+	}
+	if !viper.GetBool(disableOptimizations) {
+		options = append(options, "kubelet.housekeeping-interval=5m")
+	}
+	for _, eo := range options {
+		if config.ExtraOptions.Exists(eo) {
+			klog.Infof("skipping extra-config %q.", eo)
+			continue
+		}
+		klog.Infof("setting extra-config: %s", eo)
+		if err := config.ExtraOptions.Set(eo); err != nil {
+			exit.Error(reason.InternalConfigSet, "failed to set extra option", err)
+		}
+	}
+	return config.ExtraOptions
+}
+
 func getRepository(cmd *cobra.Command, k8sVersion string) string {
 	repository := viper.GetString(imageRepository)
 	mirrorCountry := strings.ToLower(viper.GetString(imageMirrorCountry))
@@ -493,6 +516,7 @@ func generateNewConfigFromFlags(cmd *cobra.Command, k8sVersion string, drvName s
 		MountType:               viper.GetString(mountTypeFlag),
 		MountUID:                viper.GetString(mountUID),
 		BinaryMirror:            viper.GetString(binaryMirror),
+		DisableOptimizations:    viper.GetBool(disableOptimizations),
 		KubernetesConfig: config.KubernetesConfig{
 			KubernetesVersion:      k8sVersion,
 			ClusterName:            ClusterFlagValue(),
@@ -507,7 +531,7 @@ func generateNewConfigFromFlags(cmd *cobra.Command, k8sVersion string, drvName s
 			NetworkPlugin:          chosenNetworkPlugin,
 			ServiceCIDR:            viper.GetString(serviceCIDR),
 			ImageRepository:        getRepository(cmd, k8sVersion),
-			ExtraOptions:           config.ExtraOptions,
+			ExtraOptions:           getExtraOptions(),
 			ShouldLoadCachedImages: viper.GetBool(cacheImages),
 			CNI:                    getCNIConfig(cmd),
 			NodePort:               viper.GetInt(apiServerPort),
@@ -519,17 +543,6 @@ func generateNewConfigFromFlags(cmd *cobra.Command, k8sVersion string, drvName s
 		cc.ContainerVolumeMounts = []string{viper.GetString(mountString)}
 	}
 
-	if detect.IsCloudShell() {
-		err := cc.KubernetesConfig.ExtraOptions.Set("kubelet.cgroups-per-qos=false")
-		if err != nil {
-			exit.Error(reason.InternalConfigSet, "failed to set cloud shell kubelet config options", err)
-		}
-		err = cc.KubernetesConfig.ExtraOptions.Set("kubelet.enforce-node-allocatable=\"\"")
-		if err != nil {
-			exit.Error(reason.InternalConfigSet, "failed to set cloud shell kubelet config options", err)
-		}
-	}
-
 	if driver.IsKIC(drvName) {
 		si, err := oci.CachedDaemonInfo(drvName)
 		if err != nil {
@@ -711,13 +724,14 @@ func updateExistingConfigFromFlags(cmd *cobra.Command, existing *config.ClusterC
 	updateStringFromFlag(cmd, &cc.MountType, mountTypeFlag)
 	updateStringFromFlag(cmd, &cc.MountUID, mountUID)
 	updateStringFromFlag(cmd, &cc.BinaryMirror, binaryMirror)
+	updateBoolFromFlag(cmd, &cc.DisableOptimizations, disableOptimizations)
 
 	if cmd.Flags().Changed(kubernetesVersion) {
 		cc.KubernetesConfig.KubernetesVersion = getKubernetesVersion(existing)
 	}
 
 	if cmd.Flags().Changed("extra-config") {
-		cc.KubernetesConfig.ExtraOptions = config.ExtraOptions
+		cc.KubernetesConfig.ExtraOptions = getExtraOptions()
 	}
 
 	if cmd.Flags().Changed(cniFlag) || cmd.Flags().Changed(enableDefaultCNI) {

pkg/minikube/config/types.go

@@ -96,6 +96,7 @@ type ClusterConfig struct {
 	MountType               string
 	MountUID                string
 	BinaryMirror            string // Mirror location for kube binaries (kubectl, kubelet, & kubeadm)
+	DisableOptimizations    bool
 }
 
 // KubernetesConfig contains the parameters used to configure the VM Kubernetes.

pkg/minikube/driver/driver.go

@@ -235,7 +235,7 @@ type FlagHints struct {
 
 // FlagDefaults returns suggested defaults based on a driver
 func FlagDefaults(name string) FlagHints {
-	fh := FlagHints{ExtraOptions: []string{"kubelet.housekeeping-interval=5m"}}
+	fh := FlagHints{}
 	if name != None {
 		fh.CacheImages = true
 		return fh

pkg/minikube/driver/driver_test.go

@@ -85,7 +85,7 @@ func TestMachineType(t *testing.T) {
 }
 
 func TestFlagDefaults(t *testing.T) {
-	expected := FlagHints{CacheImages: true, ExtraOptions: []string{"kubelet.housekeeping-interval=5m"}}
+	expected := FlagHints{CacheImages: true}
 	if diff := cmp.Diff(FlagDefaults(VirtualBox), expected); diff != "" {
 		t.Errorf("defaults mismatch (-want +got):\n%s", diff)
 	}
@@ -98,7 +98,7 @@ func TestFlagDefaults(t *testing.T) {
 
 	expected = FlagHints{
 		CacheImages:  false,
-		ExtraOptions: []string{"kubelet.housekeeping-interval=5m", fmt.Sprintf("kubelet.resolv-conf=%s", tf.Name())},
+		ExtraOptions: []string{fmt.Sprintf("kubelet.resolv-conf=%s", tf.Name())},
 	}
 	systemdResolvConf = tf.Name()
 	if diff := cmp.Diff(FlagDefaults(None), expected); diff != "" {

pkg/minikube/node/start.go

@@ -256,9 +256,11 @@ func handleAPIServer(starter Starter, cr cruntime.Manager, hostIP net.IP) (*kube
 		return nil, bs, errors.Wrap(err, "Failed kubeconfig update")
 	}
 
-	// Scale down CoreDNS from default 2 to 1 replica.
-	if err := kapi.ScaleDeployment(starter.Cfg.Name, meta.NamespaceSystem, kconst.CoreDNSDeploymentName, 1); err != nil {
-		klog.Errorf("Unable to scale down deployment %q in namespace %q to 1 replica: %v", kconst.CoreDNSDeploymentName, meta.NamespaceSystem, err)
+	if !starter.Cfg.DisableOptimizations {
+		// Scale down CoreDNS from default 2 to 1 replica.
+		if err := kapi.ScaleDeployment(starter.Cfg.Name, meta.NamespaceSystem, kconst.CoreDNSDeploymentName, 1); err != nil {
+			klog.Errorf("Unable to scale down deployment %q in namespace %q to 1 replica: %v", kconst.CoreDNSDeploymentName, meta.NamespaceSystem, err)
+		}
 	}
 
 	// Not running this in a Go func can result in DNS answering taking up to 38 seconds, with the Go func it takes 6-10 seconds.

site/content/en/docs/commands/start.md

@@ -36,6 +36,7 @@ minikube start [flags]
       --cri-socket string                 The cri socket path to be used.
       --delete-on-failure                 If set, delete the current cluster if start fails and try again. Defaults to false.
       --disable-driver-mounts             Disables the filesystem mounts provided by the hypervisors
+      --disable-optimizations             If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.
       --disk-size string                  Disk size allocated to the minikube VM (format: <number>[<unit>], where unit = b, k, m or g). (default "20000mb")
       --dns-domain string                 The cluster dns domain name used in the Kubernetes cluster (default "cluster.local")
       --dns-proxy                         Enable proxy for NAT DNS requests (virtualbox driver only)

test/integration/functional_test.go

@@ -755,7 +755,11 @@ func validateExtraConfig(ctx context.Context, t *testing.T, profile string) {
 
 	// docs: Make sure the specified `--extra-config` is correctly returned
 	expectedExtraOptions := "apiserver.enable-admission-plugins=NamespaceAutoProvision"
+	if !strings.Contains(afterCfg.Config.KubernetesConfig.ExtraOptions.String(), expectedExtraOptions) {
+		t.Errorf("expected ExtraOptions to contain %s but got %s", expectedExtraOptions, afterCfg.Config.KubernetesConfig.ExtraOptions.String())
+	}
 
+	expectedExtraOptions = "kubelet.housekeeping-interval=5m"
 	if !strings.Contains(afterCfg.Config.KubernetesConfig.ExtraOptions.String(), expectedExtraOptions) {
 		t.Errorf("expected ExtraOptions to contain %s but got %s", expectedExtraOptions, afterCfg.Config.KubernetesConfig.ExtraOptions.String())
 	}

test/integration/guest_env_test.go

@@ -37,11 +37,15 @@ func TestGuestEnvironment(t *testing.T) {
 	defer CleanupWithLogs(t, profile, cancel)
 
 	t.Run("Setup", func(t *testing.T) {
-		args := append([]string{"start", "-p", profile, "--install-addons=false", "--memory=2048", "--wait=false"}, StartArgs()...)
+		args := append([]string{"start", "-p", profile, "--install-addons=false", "--memory=2048", "--wait=false", "--disable-optimizations=true"}, StartArgs()...)
 		rr, err := Run(t, exec.CommandContext(ctx, Target(), args...))
 		if err != nil {
 			t.Errorf("failed to start minikube: args %q: %v", rr.Command(), err)
 		}
+
+		if strings.Contains(rr.Stderr.String(), "kubelet.housekeeping-interval=5m") {
+			t.Error("--disable-optimizations=true is not working, optimizations found")
+		}
 	})
 
 	// Run as a group so that our defer doesn't happen as tests are runnings

translations/de.json

@@ -327,6 +327,7 @@
 	"If present, writes to the provided file instead of stdout.": "Falls gesetzt, wird in die angegebene Datei geschrieben anstatt auf stdout.",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "Falls gesetzt, werden alle Treiber automatisch auf die aktuellste Version geupdated. Default: true",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "Falls gesetzt, lösche den Cluster wenn der Start fehlschlägt und versuche erneut zu starten. Default: false",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "Falls gesetzt, lade einen tarball von vorbereiteten Images herunter, falls vorhanden, um die Startzeit zu verbessern. Default: true",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "Fall gesetzt, zwinge die Container Runtime systemd als cgroup Manager zu verwenden. Default: false",
 	"If set, install addons. Defaults to true.": "Falls gesetzt, werden Addons installiert. Default: true",
@@ -894,6 +895,7 @@
 	"failed to open browser: {{.error}}": "Öffnen des Browsers fehlgeschlagen: {{.error}}",
 	"failed to save config": "Speichern der Konfiguration fehlgeschlagen",
 	"failed to set cloud shell kubelet config options": "Setzen der Cloud Shell Kublet Konfigurations Opetionen fehlgeschlagen",
+	"failed to set extra option": "",
 	"failed to start node": "Start des Nodes fehlgeschlagen",
 	"fish completion failed": "fish completion fehlgeschlagen",
 	"fish completion.": "fish fehlgeschlagen",

translations/es.json

@@ -336,6 +336,7 @@
 	"If present, writes to the provided file instead of stdout.": "",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "",
 	"If set, install addons. Defaults to true.": "",
@@ -900,7 +901,7 @@
 	"failed to add node": "",
 	"failed to open browser: {{.error}}": "",
 	"failed to save config": "",
-	"failed to set cloud shell kubelet config options": "",
+	"failed to set extra option": "",
 	"failed to start node": "",
 	"fish completion failed": "",
 	"fish completion.": "",

translations/fr.json

@@ -317,6 +317,7 @@
 	"If present, writes to the provided file instead of stdout.": "S'il est présent, écrit dans le fichier fourni au lieu de la sortie standard.",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "Si défini, met automatiquement à jour les pilotes vers la dernière version. La valeur par défaut est true.",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "Si défini, supprime le cluster actuel si le démarrage échoue et réessaye. La valeur par défaut est false.",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "Si défini, télécharge l'archive tar des images préchargées si disponibles pour améliorer le temps de démarrage. La valeur par défaut est true.",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "S'il est défini, force l'environnement d'exécution du conteneur à utiliser systemd comme gestionnaire de groupe de contrôle. La valeur par défaut est false.",
 	"If set, install addons. Defaults to true.": "Si défini, installe les modules. La valeur par défaut est true.",
@@ -857,6 +858,7 @@
 	"failed to open browser: {{.error}}": "échec de l'ouverture du navigateur : {{.error}}",
 	"failed to save config": "échec de l'enregistrement de la configuration",
 	"failed to set cloud shell kubelet config options": "échec de la définition des options de configuration cloud shell kubelet",
+	"failed to set extra option": "",
 	"failed to start node": "échec du démarrage du nœud",
 	"fish completion failed": "la complétion fish a échoué",
 	"fish completion.": "complétion fish.",

translations/ja.json

@@ -324,6 +324,7 @@
 	"If present, writes to the provided file instead of stdout.": "",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "",
 	"If set, install addons. Defaults to true.": "",
@@ -909,6 +910,7 @@
 	"failed to open browser: {{.error}}": "ブラウザー起動に失敗しました: {{.error}}",
 	"failed to save config": "設定保存に失敗しました",
 	"failed to set cloud shell kubelet config options": "クラウドシェル kubelet 設定オプションの設定に失敗しました",
+	"failed to set extra option": "",
 	"failed to start node": "ノード開始に失敗しました",
 	"fish completion failed": "fish のコマンド補完に失敗しました",
 	"fish completion.": "fish のコマンド補完です。",

translations/ko.json

@@ -354,6 +354,7 @@
 	"If present, writes to the provided file instead of stdout.": "",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "",
 	"If set, install addons. Defaults to true.": "",
@@ -904,7 +905,7 @@
 	"failed to add node": "",
 	"failed to open browser: {{.error}}": "",
 	"failed to save config": "",
-	"failed to set cloud shell kubelet config options": "",
+	"failed to set extra option": "",
 	"failed to start node": "",
 	"fish completion failed": "",
 	"fish completion.": "",

translations/pl.json

@@ -340,6 +340,7 @@
 	"If present, writes to the provided file instead of stdout.": "",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "",
 	"If set, install addons. Defaults to true.": "",
@@ -910,7 +911,7 @@
 	"failed to add node": "",
 	"failed to open browser: {{.error}}": "Nie udało się otworzyć przeglądarki: {{.error}}",
 	"failed to save config": "",
-	"failed to set cloud shell kubelet config options": "",
+	"failed to set extra option": "",
 	"failed to start node": "",
 	"fish completion failed": "",
 	"fish completion.": "",

translations/ru.json

@@ -308,6 +308,7 @@
 	"If present, writes to the provided file instead of stdout.": "",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "",
 	"If set, install addons. Defaults to true.": "",
@@ -835,7 +836,7 @@
 	"failed to add node": "",
 	"failed to open browser: {{.error}}": "",
 	"failed to save config": "",
-	"failed to set cloud shell kubelet config options": "",
+	"failed to set extra option": "",
 	"failed to start node": "",
 	"fish completion failed": "",
 	"fish completion.": "",

translations/strings.txt

@@ -308,6 +308,7 @@
 	"If present, writes to the provided file instead of stdout.": "",
 	"If set, automatically updates drivers to the latest version. Defaults to true.": "",
 	"If set, delete the current cluster if start fails and try again. Defaults to false.": "",
+	"If set, disables optimizations that improve minikube performance. The optimizations applied are decreasing CoreDNS replicas from 2 to 1 and increasing kubeadm housekeeping-interval from 10s to 5m. Defaults to false.": "",
 	"If set, download tarball of preloaded images if available to improve start time. Defaults to true.": "",
 	"If set, force the container runtime to use systemd as cgroup manager. Defaults to false.": "",
 	"If set, install addons. Defaults to true.": "",
@@ -835,7 +836,7 @@
 	"failed to add node": "",
 	"failed to open browser: {{.error}}": "",
 	"failed to save config": "",
-	"failed to set cloud shell kubelet config options": "",
+	"failed to set extra option": "",
 	"failed to start node": "",
 	"fish completion failed": "",
 	"fish completion.": "",