目标重装服务器以后，本地添加密钥到这个服务器，发生如下报错：

[root@kvm_salt_zabbix gitlab]# ssh-copy-id -i   /root/.ssh/id_rsa.pub   root@47.52.x.x

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    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

de:af:f7:0e:b8:aa:87:a7:b7:79:c4:0a:59:fc:d2:46.

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:1

RSA host key for 47.52.x.x has changed and you have requested strict checking.

Host key verification failed.

原因目标服务器重装以后，key发生变化。

解决办法1：

当前服务器（非目标服务器）vim  ~/.ssh/known_hosts   删除这个目标服务器记录以后，重新添加即可。

解决办法2：

ssh-keygen -R 目标服务器IP    执行完命令以后重新添加。