ssh连接报错“WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED“问题原因及解决方法

一、问题描述

用Ansible的ping模块测试主机连通性时，第一次ping过主机192.168.18.80，但该主机有点问题，将它下线，换了一台新的替换它，然后再次ping 192.168.18.80时，出现如下所示的错误信息

[root@server ~]# ansible all -m ping
192.168.18.80 | UNREACHABLE! => {"changed": false,"msg": "Failed to connect to the host via ssh: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @\r\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\nIT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!\r\nSomeone could be eavesdropping on you right now (man-in-the-middle attack)!\r\nIt is also possible that a host key has just been changed.\r\nThe fingerprint for the ECDSA key sent by the remote host is\nSHA256:zbEO7l6AqnhvNiZvVoy5KcYGHrn10CJw0ul169LeyHU.\r\nPlease contact your system administrator.\r\nAdd correct host key in /root/.ssh/known_hosts to get rid of this message.\r\nOffending ECDSA key in /root/.ssh/known_hosts:2\r\nPassword authentication is disabled to avoid man-in-the-middle attacks.\r\nKeyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.\r\nroot@192.168.18.80: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).","unreachable": true
}

用ssh远程连接时，则出现如下所示错误

[root@server ~]# ssh 192.168.18.80
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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:zbEO7l6AqnhvNiZvVoy5KcYGHrn10CJw0ul169LeyHU.
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
ECDSA host key for 192.168.18.80 has changed and you have requested strict checking.
Host key verification failed.

二、问题原因

前后两个错误均提示 host key has just been changed和REMOTE HOST IDENTIFICATION HAS CHANGED!
中文意思就是远程主机标识已更改。

SSH远程连接主机的标识默认保存在~/.ssh/known_hosts 中，每次访问时都会到此处对比主机标识是否相同，若不相同，则提示错误或警告，目的是防止中间人攻击。

三、解决办法

删除~/.ssh/known_hosts 中对应IP所在行的信息即可，如下图所示

[root@server ~]# vim  ~/.ssh/known_hosts
192.168.18.99 ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBGEsej5rHzUx+GX65oiHKfOqDqFP2OdNhb0i80Hns0b2TObWTQMvscKjaryuh2oZbq+Esekhn98HXDNc30aEjzA=
192.168.18.199 ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHhaJ4VDE3HxK1AcsHNac4MTjv4IUauTLazQDwgh6lhCIt0qN5Zjj0+rh+isAZYOXdBp4S8K5p/YkTXalmU0CHQ=
192.168.18.80 ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHKpwuBsqrI1ogpSvLkJKJpKcXIO49sJJH3gJmykHWOp3cqfekCpXIppiEzhKslxgFEmd971DILXrpPguDEQ3UE=

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