new flag --namespace for activating non default kubeconfig context

cmd/minikube/cmd/start.go

@@ -436,7 +436,7 @@ func showKubectlInfo(kcs *kubeconfig.Settings, k8sVersion string, machineName st
 		if kcs.KeepContext {
 			out.T(style.Kubectl, "To connect to this cluster, use:  --context={{.name}}", out.V{"name": kcs.ClusterName})
 		} else {
-			out.T(style.Ready, `Done! kubectl is now configured to use "{{.name}}" by default`, out.V{"name": machineName})
+			out.T(style.Ready, `Done! kubectl is now configured to use "{{.name}}" cluster and "{{.ns}}" namespace by default`, out.V{"name": machineName, "ns": kcs.Namespace})
 		}
 	}()
 

cmd/minikube/cmd/start_flags.go

@@ -107,6 +107,7 @@ const (
 	forceSystemd            = "force-systemd"
 	kicBaseImage            = "base-image"
 	ports                   = "ports"
+	startNamespace          = "namespace"
 )
 
 var (
@@ -156,6 +157,7 @@ func initMinikubeFlags() {
 // initKubernetesFlags inits the commandline flags for Kubernetes related options
 func initKubernetesFlags() {
 	startCmd.Flags().String(kubernetesVersion, "", fmt.Sprintf("The Kubernetes version that the minikube VM will use (ex: v1.2.3, 'stable' for %s, 'latest' for %s). Defaults to 'stable'.", constants.DefaultKubernetesVersion, constants.NewestKubernetesVersion))
+	startCmd.Flags().String(startNamespace, "default", "The named space to activate after start")
 	startCmd.Flags().Var(&config.ExtraOptions, "extra-config",
 		`A set of key=value pairs that describe configuration that may be passed to different components.
 		The key should be '.' separated, and the first part before the dot is the component to apply the configuration to.
@@ -327,6 +329,7 @@ func generateClusterConfig(cmd *cobra.Command, existing *config.ClusterConfig, k
 			KubernetesConfig: config.KubernetesConfig{
 				KubernetesVersion:      k8sVersion,
 				ClusterName:            ClusterFlagValue(),
+				Namespace:              viper.GetString(startNamespace),
 				APIServerName:          viper.GetString(apiServerName),
 				APIServerNames:         apiServerNames,
 				APIServerIPs:           apiServerIPs,
@@ -548,6 +551,10 @@ func updateExistingConfigFromFlags(cmd *cobra.Command, existing *config.ClusterC
 		cc.KubernetesConfig.KubernetesVersion = getKubernetesVersion(existing)
 	}
 
+	if cmd.Flags().Changed(startNamespace) {
+		cc.KubernetesConfig.Namespace = viper.GetString(startNamespace)
+	}
+
 	if cmd.Flags().Changed(apiServerName) {
 		cc.KubernetesConfig.APIServerName = viper.GetString(apiServerName)
 	}

pkg/minikube/config/types.go

@@ -78,6 +78,7 @@ type ClusterConfig struct {
 type KubernetesConfig struct {
 	KubernetesVersion   string
 	ClusterName         string
+	Namespace           string
 	APIServerName       string
 	APIServerNames      []string
 	APIServerIPs        []net.IP

pkg/minikube/kubeconfig/settings.go

@@ -33,6 +33,9 @@ type Settings struct {
 	// The name of the cluster for this context
 	ClusterName string
 
+	// The name of the namespace for this context
+	Namespace string
+
 	// ClusterServerAddress is the address of the Kubernetes cluster
 	ClusterServerAddress string
 
@@ -104,6 +107,7 @@ func PopulateFromSettings(cfg *Settings, apiCfg *api.Config) error {
 	contextName := cfg.ClusterName
 	context := api.NewContext()
 	context.Cluster = cfg.ClusterName
+	context.Namespace = cfg.Namespace
 	context.AuthInfo = userName
 	apiCfg.Contexts[contextName] = context
 

pkg/minikube/node/start.go

@@ -318,6 +318,7 @@ func setupKubeconfig(h *host.Host, cc *config.ClusterConfig, n *config.Node, clu
 	}
 	kcs := &kubeconfig.Settings{
 		ClusterName:          clusterName,
+		Namespace:            cc.KubernetesConfig.Namespace,
 		ClusterServerAddress: addr,
 		ClientCertificate:    localpath.ClientCert(cc.Name),
 		ClientKey:            localpath.ClientKey(cc.Name),

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

@@ -75,6 +75,7 @@ minikube start [flags]
       --memory string                     Amount of RAM to allocate to Kubernetes (format: <number>[<unit>], where unit = b, k, m or g).
       --mount                             This will start the mount daemon and automatically mount files into minikube.
       --mount-string string               The argument to pass the minikube mount command on start.
+      --namespace string                  The named space to activate after start (default "default")
       --nat-nic-type string               NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only) (default "virtio")
       --native-ssh                        Use native Golang SSH client (default true). Set to 'false' to use the command line 'ssh' command when accessing the docker machine. Useful for the machine drivers when they will not start with 'Waiting for SSH'. (default true)
       --network-plugin string             Kubelet network plug-in to use (default: auto)