allow to set local kubeconfig and update the prompt

hack/local-up-cluster.sh

@@ -459,7 +459,7 @@ function start_apiserver {
                 AUTH_ARGS="--token=system:admin/system:masters"
             fi
         else
-            # default to use certificate authentication
+            # default to the admin client cert/key
             AUTH_ARGS="--client-key=${CERT_DIR}/client-admin.key --client-certificate=${CERT_DIR}/client-admin.crt"
         fi
     fi
@@ -688,7 +688,12 @@ fi
 if [[ "${START_MODE}" != "kubeletonly" ]]; then
   echo
   cat <<EOF
-To start using your cluster, open up another terminal/tab and run:
+To start using your cluster, you can open up another terminal/tab and run:
+
+  export KUBECONFIG=${CERT_DIR}/admin.kubeconfig
+  cluster/kubectl.sh
+
+Alternatively, you can write to the default kubeconfig:
 
   export KUBERNETES_PROVIDER=local
 
@@ -734,7 +739,7 @@ echo "Detected host and ready to start services.  Doing some housekeeping first.
 echo "Using GO_OUT $GO_OUT"
 KUBELET_CIDFILE=/tmp/kubelet.cid
 if [[ "${ENABLE_DAEMON}" = false ]]; then
-trap cleanup EXIT
+  trap cleanup EXIT
 fi
 
 echo "Starting services now!"