Add support for the KUBECONFIG env var during 'minikube start'.

cmd/minikube/cmd/start.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"fmt"
+	"os"
 	"strconv"
 	"strings"
 
@@ -152,7 +153,13 @@ func calculateDiskSizeInMB(humanReadableDiskSize string) int {
 // activeContext is true when minikube is the CurrentContext
 // If no CurrentContext is set, the given name will be used.
 func setupKubeconfig(name, server, certAuth, cliCert, cliKey string) error {
-	configFile := constants.KubeconfigPath
+
+	configFile := os.Getenv(constants.KubeconfigEnvVar)
+	if configFile == "" {
+		configFile = constants.KubeconfigPath
+	}
+
+	glog.Infoln("Using kubeconfig: ", configFile)
 
 	// read existing config or create new if does not exist
 	config, err := kubeconfig.ReadConfigOrNew(configFile)

pkg/minikube/constants/constants.go

@@ -36,6 +36,9 @@ var Minipath = filepath.Join(homedir.HomeDir(), ".minikube")
 // KubeconfigPath is the path to the Kubernetes client config
 var KubeconfigPath = clientcmd.RecommendedHomeFile
 
+// KubeconfigEnvVar is the env var to check for the Kubernetes client config
+var KubeconfigEnvVar = clientcmd.RecommendedConfigPathEnvVar
+
 // MinikubeContext is the kubeconfig context name used for minikube
 const MinikubeContext = "minikube"