Docker - SSH to Docker Machine - remote host identification has changed!

Since I've been deleting a docker-machine and recreate constantly, and the docker-machine ip is dynamically assigned, I got the "warning: remote host identification has changed!" a lot.

Here is the solution:

http://stackoverflow.com/questions/20840012/ssh-remote-host-identification-has-change

And the following is the screenshot of my process:

1.could not connect, got error message

2.run solution commend

3.successfully connected