git问题解决：WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

git问题解决：WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

今天连接git时，发现连接失败，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 RSA key sent by the remote host is
da:f7:3e:ba:f7:00:e6:44:76:f2:58:6e:48:******.
Please contact your system administrator.
Add correct host key in /用户/.ssh/known_hosts to get rid of this message.
Offending RSA key in /用户/.ssh/known_hosts:1
RSA host key for ip地址 has changed and you have requested strict checking.
Host key verification failed.

经排查，是github服务器升级，导致客服端known_hosts过期。原因如下：
第一次使用SSH连接时，会生成一个认证，储存在客户端的known_hosts中，远程git服务器更新时，本地known_hosts过期。

查看git服务器ip地址：

ssh-keygen -l -f ~/.ssh/known_hosts

解决方法

ssh-keygen -R 服务器端的ip地址（上面命令后缀的ip地址）

会出现以下提示：

# Host [服务器IP] found: line 1 type RSA
/用户/.ssh/known_hosts updated.
Original contents retained as /用户/.ssh/known_hosts.old

重新连接,出现一下提示（git pull 或者 git fetch --all 都可）

The authenticity of host '[服务器IP] (服务器IP)' can't be established.
RSA key fingerprint is de:f7:3e:b1:f7:01:e6:44:76:f2:56:6r:56:****.
Are you sure you want to continue connecting (yes/no)?

输入yes确认即可连接成功。