Make rbac creation idempotent.

Also cleanup the etcd data dir in jenkins.

hack/jenkins/common.sh

@@ -67,9 +67,6 @@ hdiutil info \
 # Clean up xhyve processes
 pgrep xhyve | xargs kill || true
 
-# kubeadm cleanup
-sudo kubeadm reset || true
-
 # Set the executable bit on the e2e binary and out binary
 chmod +x out/e2e-${OS_ARCH}
 chmod +x out/minikube-${OS_ARCH}

hack/jenkins/linux_integration_tests_none.sh

@@ -34,5 +34,11 @@ EXTRA_ARGS="--bootstrapper=kubeadm"
 SUDO_PREFIX="sudo -E "
 export KUBECONFIG="/root/.kube/config"
 
+# "none" driver specific cleanup from previous runs.
+# kubeadm
+sudo kubeadm reset || true
+# Cleanup data directory
+sudo rm -rf /data/*
+
 # Download files and set permissions
 source common.sh

pkg/minikube/bootstrapper/kubeadm/util.go

@@ -21,6 +21,7 @@ import (
 	"encoding/json"
 	"html/template"
 
+	"github.com/golang/glog"
 	"github.com/pkg/errors"
 	clientv1 "k8s.io/api/core/v1"
 	rbacv1beta1 "k8s.io/api/rbac/v1beta1"
@@ -35,7 +36,10 @@ import (
 	"k8s.io/minikube/pkg/util"
 )
 
-const masterTaint = "node-role.kubernetes.io/master"
+const (
+	masterTaint = "node-role.kubernetes.io/master"
+	rbacName    = "minikube-rbac"
+)
 
 var master = ""
 
@@ -92,7 +96,7 @@ func elevateKubeSystemPrivileges() error {
 	client, err := k8s.GetClientset()
 	clusterRoleBinding := &rbacv1beta1.ClusterRoleBinding{
 		ObjectMeta: v1.ObjectMeta{
-			Name: "minikube-rbac",
+			Name: rbacName,
 		},
 		Subjects: []rbacv1beta1.Subject{
 			{
@@ -107,6 +111,10 @@ func elevateKubeSystemPrivileges() error {
 		},
 	}
 
+	if _, err := client.RbacV1beta1().ClusterRoleBindings().Get(rbacName, metav1.GetOptions{}); err == nil {
+		glog.Infof("Role binding %s already exists. Skipping creation.", rbacName)
+		return nil
+	}
 	_, err = client.RbacV1beta1().ClusterRoleBindings().Create(clusterRoleBinding)
 	if err != nil {
 		return errors.Wrap(err, "creating clusterrolebinding")