首先制作密码匙∶
ssh-keygen -t rsa 按三次 Return 键
scp ~/.ssh/ida_dsa.pub username@somewhere.com:~/.ssh/authorized_keys2

$ssh-keygen -t rsa
$Generating public/private rsa key pair.
$Enter file in which to save the key (/root/.ssh/id_rsa): ←直接回车
$Enter passphrase (empty for no passphrase): ←直接回车
$Enter same passphrase again: ←直接回车
$Your identification has been saved in /root/.ssh/id_rsa.
$Your public key has been saved in /root/.ssh/id_rsa.pub.
$The key fingerprint is:
$49:9c:8a:8f:bc:19:5e:8c:c0:10:d3:15:60:a3:32:1c root@Client

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