[hadoop@zb02 .ssh]$ scp authorized_keys hadoop@zb03:/home/hadoop/.ssh
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
47:9e:c6:8c:ab:46:90:70:b4:0f:e6:67:53:90:c8:63.
Please contact your system administrator.
Add correct host key in /home/hadoop/.ssh/known_hosts to get rid of this message.
Offending key in /home/hadoop/.ssh/known_hosts:1
RSA host key for zb03 has changed and you have requested strict checking.
Host key verification failed.
lost connection
解決辦法：
在.ssh目錄下有一個 known_hosts文件 把這個文件刪除或者改名 即可