SSH 密钥登录远程服务器

重新安装了腾讯服务器的系统，改为ubuntu18.04, 默认登陆方式是SSH（放弃了账号密码方式），按照教程设置了，发现登录失败，失败内容如下：

BendeMacBook-Pro:Downloads ben$ ssh -i "/Users/ben/Downloads/ssh_key_tencent" ubuntu@1.2.3.4
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 is
SHA256:TCLyp/7oq9scAdpYXgflbM75zvo1OaoCudzzuxzT8Ew.
Please contact your system administrator.
Add correct host key in /Users/ben/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/ben/.ssh/known_hosts:6
ECDSA host key for 1.2.3.4 has changed and you have requested strict checking.
Host key verification failed.

发现这一句：ECDSA host key for 1.2.3.4 has changed and you have requested strict checking

修改此IP下的公钥内容

vim ~/.ssh/known_hosts

1.2.3.4 ecdsa-sha2-nistp256 xxx

xxx改为控制台中的公钥内容即可。

保存，按照文档中的方式可以登录，文档地址：https://cloud.tencent.com/document/product/213/35700#.E4.BD.BF.E7.94.A8.E5.AF.86.E9.92.A5.E7.99.BB.E5.BD.95

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