Skip Kubernetes download if the package has exist

- Untrack Kubernetes folder, it is the unzip folder of Kubernetes
release
- Update README, add notice about Kubernetes release download
- Detect whether the Kubernetes package exist before download

.gitignore

@@ -1,3 +1,4 @@
 .vagrant/*
 .DS_Store
 *.tar.gz
+kubernetes

README-cn.md

@@ -59,10 +59,9 @@ Kubernetes service IP范围：10.254.0.0/16
 ```bash
 git clone https://github.com/rootsongjc/kubernetes-vagrant-centos-cluster.git
 cd kubernetes-vagrant-centos-cluster
-wget https://storage.googleapis.com/kubernetes-release/release/v1.11.0/kubernetes-server-linux-amd64.tar.gz
 ```
 
-注：您可以在[这里](https://kubernetes.io/docs/imported/release/notes/)找到Kubernetes的发行版下载地址。
+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。
 
 使用vagrant启动集群。
 

README.md

@@ -62,10 +62,9 @@ Clone this repo into your local machine and download kubernetes binary release f
 vagrant plugin install vagrant-winnfsd
 git clone https://github.com/rootsongjc/kubernetes-vagrant-centos-cluster.git
 cd kubernetes-vagrant-centos-cluster
-wget https://storage.googleapis.com/kubernetes-release/release/v1.11.0/kubernetes-server-linux-amd64.tar.gz
 ```
 
-Note: you can find download address of the Kubernetes releases [here](https://kubernetes.io/docs/imported/release/notes/).
+**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.
 
 Set up Kubernetes cluster with vagrant.
 
@@ -75,8 +74,6 @@ vagrant up
 
 Wait about 10 minutes the kubernetes cluster will be setup automatically.
 
-**Note**
-
 If you have difficult to vagrant up the cluster because of have no way to downlaod the `centos/7` box, you can download the box and add it first.
 
 **Add centos/7 box manually**

install.sh

@@ -8,10 +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"
 # Download Kubernetes
-if [ $(hostname) = "node1" ]
-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