linux中远程连接（如SSH）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)!
网上查了一下，用

rm -rf .ssh/known_hosts
删除主机列表就行了。