ssh、scp不能远程登录与复制都失败解决方案

问题导读：
1.当我们遇到scp，ssh都不能成功会遇到下面错误，该如何解决？
2.出现这个问题的原因是什么？




aboutyun@master:~$ ssh slave1
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
4b:d3:4f:1e:6f:e6:3e:02:19:64:33:0b:2f:24:a2:6a.
Please contact your system administrator.
Add correct host key in /home/aboutyun/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/aboutyun/.ssh/known_hosts:1
  remove with: ssh-keygen -f "/home/aboutyun/.ssh/known_hosts" -R slave1
ECDSA host key for slave1 has changed and you have requested strict checking.
Host key verification failed.
解决办法:
1.追加上面红字部分1，则为1d，是2则为2d,然后执行下面命令即可
sed -i '1d' ~/.ssh/known_hosts
2.备份一份known_hosts1，然后删除known_hosts




重新链接各台机器
例如：重新连接slave1节点：
输入下面命令：（slave1）

ssh slave1
复制代码

Linux会自动把登录的远程电脑记录到本台pc机器(master)的~/.ssh中的known_hosts中。