Are you sure you want to continue connecting etc ssh ssh_config StrictHostKeyChecking no

Are you sure you want to continue connecting (yes/no)

每次ssh 进入一台新机器都会跳出如下的提示:

The authenticity of host '111.222.333.444 (111.222.333.444)' can't be established.
RSA key fingerprint is f3:cf:58:ae:71:0b:c8:04:6f:34:a3:b2:e4:1e:0c:8b.
Are you sure you want to continue connecting (yes/no)? 

感觉很烦，有以下方法可以解决这个问题：

1. 加入一个参数：

ssh -o "StrictHostKeyChecking no" user@host

2.修改配置文件

在文件/etc/ssh/ssh_config(全局)或者~/.ssh/config(某用户)开头加入以下内容:

Host 192.168.0.*

   StrictHostKeyChecking no

   UserKnownHostsFile=/dev/null

or 

Host *
   StrictHostKeyChecking no
   UserKnownHostsFile=/dev/null