linux重装系统后ssh 登录失败

linux重装系统后ssh 登录失败

前段时间买了一台linux服务器，今天心血来潮想要重装下系统，结果发现重装之后ssh 连接服务器失败，报错如下： @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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:kIBiWLcDm7llv9KqOy/XjDQKGOtupTOCwpAbPybDY8g. Please contact your system administrator. Add correct host key in /Users/user/.ssh/known_hosts to get rid of this message. Offending ECDSA key in /Users/user/.ssh/known_hosts:11 ECDSA host key for x.x.x.x has changed and you have requested strict checking. Host key verification failed.

当client通过ssh 连接server时,会把server的信息保存在自己的家目录下，(~/.ssh/known_hosts),如果server被重装，server的信息肯定就改变了（但是ip并未发生改变），与之前known_hosts里的信息不一致，从而导致密钥认证失败。

解决方法如下：根据提示信息，server的信息在/Users/user/.ssh/known_hosts:11，直接把known_hosts里server的信息删掉即可。 即类似这个key信息：11.11.11.34 ssh-rsa AAAAB3NzakjfksfhHIHhlQEA0Whm0wOOL7eN0XHfHd7NDl6JwUJbtat2V4sYaU4tW0TiuZEOyIeoX7dfpQS2sMtIMkt4u56St+zCLqncNO24pr6YlxNmLGs8/a/2gff+6cAiDqOFP+kbZycIatgZaVLlCm2jjz2J61CClC9g3WK9xXpRoDuynwB2WYo5Uc6kptsAresbCpKZnok8YTsNC9stXYn5Pfxt3jFssT9iIX30lOtrJNDoU5oZZ2oLKX5DHMoGzzoz2Nhr8hdFkTHbA6xa0VwKDI2T7CphzNZxcxlVihTcxUWZZYbyOiA0RGE9NIpsezVNWLi0m5Zz8lcdAylxo6JtP/Mav7/6wOnVQk9Ovw==

删除之后，尝试重新连接server,会提示 The authenticity of host ‘111.11.11.111 (111.11.11.111)’ can’t be established. ECDSA key fingerprint is SHA256:kIBiWLcDm7llv9KqOy/XjDQKGOtupTOCwpAbPybDY8g. Are you sure you want to continue connecting (yes/no)?

输入yes，server与本地重新建立对应关系，这时/Users/user/.ssh/known_hosts又生成了新的key 之后你就可以正常使用server了

亲测有效