ping 

注：Extra Packages for Enterprise Linux是为“红帽系”的操作系统提供额外的软件包，适用于RHEL、CentOS和Scientific Linux。相当于
是一个软件仓库，大多数rpm包在官方 repository 中是找不到的）
yum install -y epel-release

net-tool：工具包集合，包含ifconfig等命令
yum install -y net-tools 

vim：编辑器
yum install -y vim

关闭防火墙
systemctl stop firewalld
systemctl disable firewalld.service

useradd atguigu
echo '123456'|passwd --stdin atguigu

方便后期加sudo执行root权限的命令
vim /etc/sudoers
修改/etc/sudoers文件，在%wheel这行下面添加一行，如下所示：
%wheel  ALL=(ALL)       ALL
atguigu   ALL=(ALL)     NOPASSWD:ALL
注意：atguigu这一行不要直接放到root行下面，因为所有用户都属于wheel组，你先配置了atguigu具有免密功能，但是程序执行到%wheel行时，
该功能又被覆盖回需要密码。所以atguigu要放到%wheel这行下面。

rpm -qa | grep -i java | xargs -n1 rpm -e --nodeps

#rpm -qa：查询所安装的所有rpm软件包
#grep -i：忽略大小写
#xargs -n1：表示每次只传递一个参数
#rpm -e –nodeps：强制卸载软件

cat /etc/hosts
192.168.10.131 k8s01
192.168.10.132 k8s02
192.168.10.133 k8s03

mkdir -p /opt/module/
unzip jdk1.8.0_171.zip
mv jdk1.8.0_171 /opt/module/
chown -R atguigu.atguigu /opt/module/
su - atguigu

sudo vim /etc/profile.d/my_env.sh
#JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_171
export PATH=$PATH:$JAVA_HOME/bin

. /etc/profile
java -version

[atguigu@k8s01 ~]$ ssh-keygen -t rsa
[atguigu@k8s01 ~]$ ssh-copy-id 192.168.10.131
[atguigu@k8s01 ~]$ ssh-copy-id 192.168.10.132
[atguigu@k8s01 ~]$ ssh-copy-id 192.168.10.133

[atguigu@k8s01 ~]$ sudo yum install -y rsync
[atguigu@k8s01 ~]$ echo $PATH
/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/atguigu/.local/bin:/home/atguigu/bin:/opt/module/jdk1.8.0_171/bin

[atguigu@k8s01 ~]$ cd /home/atguigu
[atguigu@k8s01 ~]$ ls
[atguigu@k8s01 ~]$ mkdir bin
[atguigu@k8s01 ~]$ cd bin/
[atguigu@k8s01 bin]$ vim xsync
#!/bin/bash

#1. 判断参数个数
if [ $# -lt 1 ]
then
    echo Not Enough Arguement!
    exit;
fi

#2. 遍历集群所有机器
for host in 192.168.10.131 192.168.10.132 192.168.10.133
do
    echo ====================  $host  ====================
    #3. 遍历所有目录，挨个发送

    for file in $@
    do
        #4. 判断文件是否存在
        if [ -e $file ]
            then
                #5. 获取父目录
                pdir=$(cd -P $(dirname $file); pwd)

                #6. 获取当前文件的名称
                fname=$(basename $file)
                ssh $host "mkdir -p $pdir"
                rsync -av $pdir/$fname $host:$pdir
            else
                echo $file does not exists!
        fi
    done
done

[atguigu@k8s01 bin]$ chmod +x xsync
[atguigu@k8s01 bin]$ xsync /home/atguigu/bin
==================== 192.168.10.131 ====================
sending incremental file list

sent 93 bytes  received 17 bytes  220.00 bytes/sec
total size is 754  speedup is 6.85
==================== 192.168.10.132 ====================
sending incremental file list
bin/
bin/xsync

sent 893 bytes  received 39 bytes  1,864.00 bytes/sec
total size is 754  speedup is 0.81
==================== 192.168.10.133 ====================
sending incremental file list
bin/
bin/xsync

将脚本复制到/bin中，以便全局调用
[atguigu@k8s01 module]$ sudo cp /home/atguigu/bin/xsync /bin/