Connect to rancher node to trouble shooting

hi. i am running rancher 2.0 with AWS EC2 configuration with all default setting. It always show"Waiting for SSH to be available…".
I suspect there is something wrong with connection. I am wondering how to connect to rancher node to troubleshoot. The problem is rancher node was spawn with some self-generated keypair, which I don’t. How can I fetch that keypair or add my ssh key to node’s authorize_key file.

I haven’t done much with Rancher 2.0 at this point. But that message in Rancher 1.6 would indicate the node didn’t have port 22 open in the security group allowing the Rancher host to connect and setup the node.