我有一个脚本dynamic创buildAmazon EC2实例，并将其ssh密钥添加到我的〜/ .ssh / known_hosts。 但是，每当我需要通过终止并重新创build实例来刷新实例时，我会收到令人厌恶的警告消息，如：
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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 <fingerprint>. Please contact your system administrator. Add correct host key in ~/.ssh/known_hosts to get rid of this message. Offending ECDSA key in ~/.ssh/known_hosts:94 remove with: ssh-keygen -f "~/.ssh/known_hosts" -R <hostname> Password authentication is disabled to avoid man-in-the-middle attacks. Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks. 警告是可以理解的，但即使我运行该命令来删除旧密钥，login仍然给我警告：
Warning: Permanently added '<hostname>' (ECDSA) to the list of known hosts. Warning: the ECDSA host key for '<hostname>' differs from the key for the IP address '<ip>' Offending key for IP in ~/.ssh/known_hosts:96
解决办法是手动删除我的known_hosts中的那一行，但有没有办法通过预先运行一个单一的命令来自动执行此操作？
从man ssh-keygen （SSH-KEYGEN（1））
-R hostname Removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts (see the -H option above).
尝试这个：
ssh-keygen -R hostname [-f known_hosts_file]