.>ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/ecwuliu/.ssh/id_rsa):
>scp ~/.ssh/id_rsa.pub root@10.175.183.246:/root/.ssh/authorized_keys
root@10.175.183.246's password:
id_rsa.pub 100% |********
>ssh root@10.175.183.246