删除ssh key

背景，通过ssh远程机器，第一次都会给出关于key的提示，输入：yes 可继续，此时远程机器的ssh key就保留本地，以后使用就能直接ssh。

如果远程机器重装系统了，我们再ssh，由于本地存储的是之前远端机器的ssh key，就造成无言验证通过。ssh被远端拒绝。

如下报错信息：

[root@localhost sharefile]# scp iomonitor-src.tar.gz root@ 10.49.32.150:/root
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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 ED25519 key sent by the remote host is
SHA256:ww0vBoLq47smkOJyRA7BNLZoCkN14qx1EAHrsQp/htc.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:2
Host key for 10.49.32.150 has changed and you have requested strict checking.
Host key verification failed.
Connection closed
 

此时就需要清除之前的key，运行如下命令即可：

ssh-keygen -R 10.32.49.150