ssh-copy-id（双机互信）

使用下例中ssky-keygen和ssh-copy-id，仅需通过3个步骤的简单设置而无需输入密码就能登录远程Linux主机。 

ssh-keygen 创建公钥和密钥。 

ssh-copy-id 把本地主机的公钥复制到远程主机的authorized_keys文件上。

ssh-copy-id 也会给远程主机的用户主目录（home）和~/.ssh, 和~/.ssh/authorized_keys设置合适的权限 。

步骤1: 用 ssh-key-gen 在本地主机上创建公钥和密钥

#ssh-keygen -t rsa

Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] 

Enter passphrase (empty for no passphrase): [Press Enter key]

Enter same passphrase again: [Pess Enter key]

Your identification has been saved in /home/jsmith/.ssh/id_rsa.

Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub. 

The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 

ligh@local-host

步骤2: 用 ssh-copy-id 把公钥复制到远程主机上

#ssh-copy-id -i ~/.ssh/id_rsa.pub  [email protected]

ligh@remote-host‘s password:

Now try logging into the machine, with �Dssh ?remote-host‘‖, and check in: 

.ssh/authorized_keys to make sure we haven‘t added extra keys that you weren‘t expecting.

[注: ssh-copy-id 把密钥追加到远程主机的 .ssh/authorized_key 上.]

步骤3: 直接登录远程主机

#ssh remote-host 

Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 

[注: SSH 不会询问密码.] 

ligh@remote-host$ 

[注: 你现在已经登录到了远程主机上]