配置Hadoop，

安装Hadoop

hadoop伪分布式配置

4, 配置ssh免密码登录

    ssh-keygen -t rsa -P '' ~/.ssh/id_rsa
    cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

如果文件~/.ssh/authorized_keys不存在，则通过touch ~/.ssh/authorized_keys新建
通过ssh localhost来测试是否还需要密码登录。