问题:对一台机器重装并配置原来的IP之后无法使用scp或ssh

[root@rac1 ~]# scp installpackage.sh 192.168.8.237:/tmp/
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
08:bc:6b:6a:cb:1f:05:51:a5:33:ac:8b:28:50:a2:4d.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:6
RSA host key for 192.168.8.237 has changed and you have requested strict checking.
Host key verification failed.
lost connection

因为同一个IP远端的信息有变动,与存在本地的公钥不相符.

解决办法:删除本地的记录信息
[root@rac1 ~]# cd .ssh/
[root@rac1 .ssh]# ls
known_hosts
[root@rac1 .ssh]# vi known_hosts

192.168.2.71 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEArL+Gg9PZi536IRjYRur18qKrB+qeiPpSETFi7EnzFBqhqlGW8nIB3etufKFiX/E68dM6XcU4USQllwKebz373hjxXj3F5Ahr8/+ualDDkjh8ujSJnysioPtbrZS57RDtmMR8BXusETFCwjZjxSUQ9q+rKwSh4WpAQc6O5yoaGZlhntv7/Ij+s8PlGBb5ZbR2tUASxz/cbUAhhdvhnYlIijx9XV4jZJApS7g7s38h8T0gysYSH44lEYRmRXz+L3bQciHYx+i2s1kF4H0XnRkUpK9kRpZ0NddWXnAPLN192j/SKh1pic7/6aUH1HrGNv2jgC9wzZvs3I+zyQ==
192.168.7.25 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEArFgDJR1xVUBGOP2EDYe/ZFdVpNLxu9VTUiYXIvOJV43uJXd0JyHRK7qb1NMG32AXk8YW+upfSPzmu+56M3WaGs0MSU4piOJbgiIzz1gLjYrMzPIiVyeaPhupNpNycEllPcNHbzQ3C1zCOL6V4pW8I/YfLbP4G4PDh9uywyE5IKOldVuZ/B9j8CmiQPN4WcRuxM9aFfISLnpkY9lw+d9kqAfBfIgN+bbsinfuXfgs6xXILr79Fd3thk3wkN87KoWO5iSbFA7Biw0Q7qNpOB2ictBsy+9L1kU3YJk8CsCD1NJby1GUbtB2vLB4J0zGwsPkGtYpU2Q1ix4qZ6iiMB94Cw==
192.168.8.237 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA4KxpYBtTbj0DCKhcb7g03Qe3zJC3LQNOJzUn8yZlja1kLmqPdFsOy//Ot10pqrSS5sFG84qEf/ojfigfalGJxpe0sHb5uyfpz9DHLxSnjSz3dtAojZtC+AMDRDjIfjKyC66qzdzurRdbzxQ44C58oR+OHW0ajOXB7LCg9szYarc3WeK40Zvrb8zR07KT3Vke/8WKGQ7X+Aim9BbJOQ/y56PL2isB3MYwDLk4xPpHwMO3aLJtrU1TBsvqcPgplfm5aZQnWnFhkiyBG/TUObqp2JKPZffnRbPChHc9T4BG2oKlPeEEywR2mr6Fyh4EZHjIJ4/EUQ+R5LgUk8dDWkgQ==
 

删除对应IP所对应的那条记录,保存退出即可.