服务器重装系统之后，MacOS的ssh登陆不了，参考线上的资料，顺便做个记录 ssh报错：

The fingerprint for the ECDSA key sent by the remote host is
SHA256:9cca1Zbt5wy8i6p5yJM9EcuTlpLKjjUNfLMYRpgq81s.
Please contact your system administrator.
Add correct host key in /var/root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /var/root/.ssh/known_hosts:1
ECDSA host key for x.x.x.x has changed and you have requested strict checking.
Host key verification failed.

解决方案： 当重装系统时，本地的ssh 连接key要更新，mac是这样，需要重新执行脚本，生成新的key

ssh-keygen -R x.x.x.x(服务器ip)