hadoop@master:~$ scp /home/hadoop/.ssh/authorized_keys node3:/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 a host key has just been changed.The fingerprint for the ECDSA key sent by the remote host isa8:68:2e:0e:1e:67:33:db:0f:f8:d0:0b:43:fe:17:e2.Please contact your system administrator.Add correct host key in /home/hadoop/.ssh/known_hosts to get rid of this message.Offending ECDSA key in /home/hadoop/.ssh/known_hosts:6  remove with: ssh-keygen -f "/home/hadoop/.ssh/known_hosts" -R node3ECDSA host key for node3 has changed and you have requested strict checking.Host key verification failed.lost connection

hadoop@master:~$ cd .sshhadoop@master:~/.ssh$ lsauthorized_keys  id_rsa  id_rsa.pub  known_hostshadoop@master:~/.ssh$ sudo vim known_hosts[sudo] password for hadoop:hadoop@master:~/.ssh$ scp authorized_keys node1:/home/hadoop/.ssh/authorized_keys                                                                                                                                             100%  395     0.4KB/s   00:00hadoop@master:~/.ssh$ scp authorized_keys node2:/home/hadoop/.ssh/authorized_keys                                                                                                                                             100%  395     0.4KB/s   00:00hadoop@master:~/.ssh$ scp authorized_keys node3:/home/hadoop/.ssh/hadoop@node3‘s password:authorized_keys                                                                                                                                             100%  395     0.4KB/s   00:00hadoop@master:~/.ssh$