01-SSH免密登录

三台机器  hadoop01 ， hadoop02，hadoop03

1：将hadoop02和hadoop03的共钥id_ras.pub拷贝到hadoop01中的authorized_keys文件中。

      [hadoop@hadoop02 ~]$cat ~/.ssh/id_rsa.pub | ssh hadoop@hadoop01 'cat >> ~/.ssh/authorized_keys'

      [hadoop@hadoop03 ~]$cat ~/.ssh/id_rsa.pub | ssh hadoop@hadoop01 'cat >> ~/.ssh/authorized_keys'

2：hadoop01中的authorized_keys文件分发到hadoop02和hadoop03节点。

      [hadoop@hadoop01 .ssh]$scp -r authorized_keys hadoop@hadoop02:~/.ssh/

      [hadoop@hadoop01 .ssh]$scp -r authorized_keys hadoop@hadoop03:~/.ssh/

hadoop01节点就可以免密登录hadoop02和hadoop03节点