Repair missing/invalid kubecontext before checking cluster health

pkg/minikube/bootstrapper/kubeadm/kubeadm.go

@@ -51,6 +51,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/constants"
 	"k8s.io/minikube/pkg/minikube/cruntime"
 	"k8s.io/minikube/pkg/minikube/driver"
+	"k8s.io/minikube/pkg/minikube/kubeconfig"
 	"k8s.io/minikube/pkg/minikube/machine"
 	"k8s.io/minikube/pkg/minikube/out"
 	"k8s.io/minikube/pkg/minikube/out/register"
@@ -538,6 +539,12 @@ func (k *Bootstrapper) restartControlPlane(cfg config.ClusterConfig) error {
 		return errors.Wrap(err, "control plane")
 	}
 
+	// Save the costly tax of reinstalling Kubernetes if the only issue is a missing kube context
+	_, err = kubeconfig.UpdateEndpoint(cfg.Name, hostname, port, kubeconfig.PathFromEnv())
+	if err != nil {
+		glog.Warningf("unable to update kubeconfig (cluster will likely require a reset): %v", err)
+	}
+
 	client, err := k.client(hostname, port)
 	if err != nil {
 		return errors.Wrap(err, "getting k8s client")

pkg/minikube/kubeconfig/kubeconfig.go

@@ -125,6 +125,7 @@ func UpdateEndpoint(contextName string, hostname string, port int, confpath stri
 
 	// if the cluster setting is missed in the kubeconfig, create new one
 	if _, ok := cfg.Clusters[contextName]; !ok {
+		glog.Infof("%q context is missing from %s - will repair!", contextName, confpath)
 		lp := localpath.Profile(contextName)
 		gp := localpath.MiniPath()
 		kcs := &Settings{