[slave1@hadoop ~]$ scp .ssh/id_rsa.pub master@hadoop.master:~/

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@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @

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The RSA host key for hadoop.master has changed,

and the key for the corresponding IP address 192.168.62.130

is unchanged. This could either mean that

DNS SPOOFING is happening or the IP address for the host

and its host key have changed at the same time.

Offending key for IP in /home/slave1/.ssh/known_hosts:2

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@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @

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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

b9:01:69:34:98:01:9d:39:ed:a2:9a:2c:79:98:34:3d.

Please contact your system administrator.

Add correct host key in /home/slave1/.ssh/known_hosts to get rid of this message.

Offending key in /home/slave1/.ssh/known_hosts:5

RSA host key for hadoop.master has changed and you have requested strict checking.

Host key verification failed.

lost connection