第一节: hadoop安装

1. hadoop下载地址 :  https://archive.apache.org/dist/hadoop/

2. ssh 免密登录:

$ ssh-keygen -t rsa 
$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys 
$ chmod 0600 ~/.ssh/authorized_keys 

 3. 实例网址: https://blog.csdn.net/bingduanlbd/article/details/51874195