错误：

guoqiang@linux-PowerEdge-R730:~$ ssh nku08@10.10.1.215
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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:K3MCgW1OPTPf2toZG561y3aUx3/5PcPYONTK11USw2g.
Please contact your system administrator.
Add correct host key in /home/guoqiang/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/guoqiang/.ssh/known_hosts:2
  remove with:
  ssh-keygen -f "/home/guoqiang/.ssh/known_hosts" -R 10.10.1.215
ECDSA host key for 10.10.1.215 has changed and you have requested strict checking.
Host key verification failed.
guoqiang@linux-PowerEdge-R730:

解决方式

第一种：

输入命令ssh-keygen -f "/home/guoqiang/.ssh/known_hosts" -R 10.10.1.215

第二种：

输入命令rm ~/.ssh/known_hosts