RSA host key for mysharebook.cn has changed and you have requested strict checking. Host key verification failed. 密钥添加报错解决八法

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。

问题解决。
解决办法参考：
1，解决办法1参考方式  http://www.cnblogs.com/jackyzzy/p/3216096.html
2，解决办法2参考方式  http://blog.csdn.net/sebarsunny/article/details/7167828

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