linux中远程连接（如SCP）出现someone could be eavesdropping on you right now的解决办法
今天用SSH连接我的远程主机，出现了以下错误：
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
因为keys 发生变化，建议先备份在删除（如果是生产一定要备份）
rm -rf .ssh/known_hosts
[root@qudao cas-server]# rm -fr ~/.ssh/known_hosts
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