ssh链接服务器报错

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@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
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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:e/FvpcXaA824parORQ6NUZbrXHRARHsPbbxGB/DkZZs.
Please contact your system administrator.
Add correct host key in /home/user1/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/user1/.ssh/known_hosts:1
ECDSA host key for [1.1.2.2]:22 has changed and you have requested strict checking.
Host key verification failed.

原因：
WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
翻译过来就是
警告：远程主机标识已更改！

此报错是由于远程的主机的公钥发生了变化导致的。
ssh服务是通过公钥和私钥来进行连接的，它会把每个曾经访问过计算机或服务器的公钥（public key），记录在~/.ssh/known_hosts 中，当下次访问曾经访问过的计算机或服务器时，ssh就会核对公钥，如果和上次记录的不同，OpenSSH会发出警告

解决办法：
删除对应ip的在known_hosts相关信息

vim /root/.ssh/known_hosts

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scp链接传输文件时报同样的错，同理，删除对应ip的相关信息