ssh 免密码登录root用户
1 每台虚拟机分别执行 ssh-****** -t rsa
2 将从机公钥追加到主机上 ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop
3 主机执行 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
3 复制到所有从机 scp ~/.ssh/authorized_keys [email protected]:~/.ssh/
4 设置文件夹权限
chmod 700 /root/.ssh
chmod 600 /root/.ssh/authorized_keys
5 重启ssh service sshd restart
6 免密登陆 ssh hadoop002