Fix Kubernetes install script

Author: rootsongjc

README-cn.md

@@ -61,7 +61,9 @@ git clone https://github.com/rootsongjc/kubernetes-vagrant-centos-cluster.git
 cd kubernetes-vagrant-centos-cluster
 ```
 
-注：如果您是第一次运行该部署程序，那么可以直接执行下面的命令，它将自动帮你下载 Kubernetes 安装包，下一次你就不需要自己下载了，另外您也可以在[这里](https://kubernetes.io/docs/imported/release/notes/)找到Kubernetes的发行版下载地址，下载 Kubernetes发行版后重命名为`kubernetes-server-linux-amd64.tar.gz`，并移动到该项目的根目录下。
+**注意**：如果您是第一次运行该部署程序，那么可以直接执行下面的命令，它将自动帮你下载 Kubernetes 安装包，下一次你就不需要自己下载了，另外您也可以在[这里](https://kubernetes.io/docs/imported/release/notes/)找到Kubernetes的发行版下载地址，下载 Kubernetes发行版后重命名为`kubernetes-server-linux-amd64.tar.gz`，并移动到该项目的根目录下。
+
+因为该项目是使用 NFS 的方式挂载到虚拟机的 `/vagrant` 目录中的，所以在安装 NFS 的时候需要您输入密码授权。
 
 使用vagrant启动集群。
 

README.md

@@ -66,6 +66,8 @@ cd kubernetes-vagrant-centos-cluster
 
 **Note**: If this your first time to setup Kubernetes cluster with vagrant, just skip the above step and run the following command, it will download Kubernetes release automatically for you and no need to download the release next time. You can find the download address the Kubernetes releases [here](https://kubernetes.io/docs/imported/release/notes/). Download the release of version you wanted, move it to the root of this repo, rename it to `kubernetes-server-linux-amd64.tar.gz` then the `install.sh` script will skip the download step.
 
+As this repo folder is mounted to `/vagrant` with NFS in virtual machines, you may be required to enter a password to for administrator privileges during the installation.
+
 Set up Kubernetes cluster with vagrant.
 
 ```bash

install.sh

@@ -8,9 +8,9 @@ mv /etc/yum.repos.d/CentOS7-Base-163.repo /etc/yum.repos.d/CentOS-Base.repo
 # using socat to port forward in helm tiller
 # install  kmod and ceph-common for rook
 yum install -y wget curl conntrack-tools vim net-tools telnet tcpdump bind-utils socat ntp kmod ceph-common dos2unix
-kubernetes_release="kubernetes-server-linux-amd64.tar.gz"
+kubernetes_release="/vagrant/kubernetes-server-linux-amd64.tar.gz"
 # Download Kubernetes
-if [[ $(hostname) = "node1"] && [ ! -f "$kubernetes_release" ]]; then
+if [[ $(hostname) == "node1" ]] && [[ ! -f "$kubernetes_release" ]]; then
     wget https://storage.googleapis.com/kubernetes-release/release/v1.11.0/kubernetes-server-linux-amd64.tar.gz -P /vagrant/
 fi