Prompt "warning: remote host identification has changed" when SSH

Reprinted from ：known_hosts The function of documents , And FAQs

When encountering the following problems ：

[email protected]:~# ssh 192.168.20.46
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
SHA256:6C6zDl5/8R8dUGhQVW8YjCpGN6wj+a95LgyoUm7B6bI.
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:13
ECDSA host key for 192.168.20.46 has changed and 

when , Never delete it directly known_hosts file , Otherwise ssh Connect other linux When the equipment , I want to reenter yes, But when there are many remote devices , Input yes It is also a relatively large workload ！！

Input yes after ,ssh It will record the public key information of the other party to the local known_hosts In the document , The next time you log in, you don't have to enter yes.

All of them have such hints , Because the public key information of the remote host and known_hosts The records in the file are different . So the solution is , Put the machine known_hosts Delete the public key information corresponding to the remote host in the file , The article reproduced at the beginning describes how to delete .