Running internal kubectl command when minikube is called as 'kubectl'

Fixes issue kubernetes#8857

Signed-off-by: Pablo Caderno <kaderno@gmail.com>

cmd/minikube/cmd/root.go

@@ -20,6 +20,7 @@ import (
 	goflag "flag"
 	"fmt"
 	"os"
+	"path/filepath"
 	"runtime"
 	"strings"
 
@@ -73,6 +74,10 @@ var RootCmd = &cobra.Command{
 // Execute adds all child commands to the root command sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
+	_, callingCmd := filepath.Split(os.Args[0])
+	if callingCmd == "kubectl" {
+		os.Args = append([]string{"minikube", callingCmd}, os.Args[1:]...)
+	}
 	for _, c := range RootCmd.Commands() {
 		c.Short = translate.T(c.Short)
 		c.Long = translate.T(c.Long)

site/content/en/docs/faq/_index.md

@@ -23,3 +23,7 @@ Alternatively, configure `sudo` to never prompt for the commands issued by minik
 minikube's bootstrapper, [Kubeadm] (https://github.com/kubernetes/kubeadm) verifies a list of features on the host system before installing Kubernetes. in case you get this error, and you still want to try minikube anyways despite your system's limitation you can skip the verification by starting minikube with this extra option:
 
 `minikube start --extra-config kubeadm.ignore-preflight-errors=SystemVerification`
+
+## Do I need to install kubectl locally?
+
+No, minikube comes with built-in kubectl [see minikube's kubectl documentation]({{< ref "docs/handbook/kubectl.md"}}). 

site/content/en/docs/handbook/kubectl.md

@@ -17,6 +17,10 @@ as well.
 
 You can also `alias kubectl="minikube kubectl --"` for easier usage.
 
+Alternatively, you can create a symbolic link to minikube's binary named 'kubectl'.
+
+`ln -s $(which minikube) /usr/local/bin/kubectl`
+
 Get pods
 
 `minikube kubectl -- get pods`