环境：两台CentOS 5.4主机，分别为CentOSA（192.168.1.102）和CentOSB（192.168.1.104）
 
一、在A主机
1)         创建transport用户、密码；切换用户
[root@CentOSA ~]# adduser transport
[root@CentOSA ~]# passwd transport
Changing password for user transport.
New UNIX password:
BAD PASSWORD: it is too simplistic/systematic
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root@CentOSA ~]# su - transport
[transport@ CentOSA ~]$
2)         创建密钥
[transport@CentOS ~]$ ssh-keygen
有的系统可能会输入ssh-keygen –t rsa，具体情况可以查看帮助：man ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/transport/.ssh/id_rsa):
指定路径，不用变，直接回车
/home/transport/.ssh/id_rsa already exists.
Enter passphrase (empty for no passphrase):
输入密码（无密码为空）：
Enter same passphrase again:
再次输入相同的密码：
Your identification has been saved in /home/transport/.ssh/id_rsa.
Your public key has been saved in /home/transport/.ssh/id_rsa.pub.
The key fingerprint is:
7e:44:4e:ac:eb:1c:2b:68:94:1f:9e:fc:2f:7a:4c:73 transport@CentOSA
二、在B主机
3)         创建transport用户、密码；切换用户
[root@CentOSB ~]# adduser transport
[root@CentOSB ~]# su - transport
[transport@ CentOSB ~]$
4)         创建密钥
[transport@CentOSB ~]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/transport/.ssh/id_rsa):
指定路径，不用变，直接回车
/home/transport/.ssh/id_rsa already exists.
Enter passphrase (empty for no passphrase):
输入密码（无密码为空）：
Enter same passphrase again:
再次输入相同的密码：
Your identification has been saved in /home/transport/.ssh/id_rsa.
Your public key has been saved in /home/transport/.ssh/id_rsa.pub.
The key fingerprint is:
7e:44:4e:ac:eb:1c:2b:68:94:1f:9e:fc:2f:7a:4c:73 transport@CentOSB
5)         创建authorized_keys
[transport@CentOSB ~]$ cd /.ssh
[transport@CentOSB .ssh]$ cat id_rsa.pub > authorized_keys
6)         修改authorized_keys的权限
[transport@CentOS .ssh]$ chmod 600 authorized_keys
7)         传输authorized_keys文件到A主机
[transport@CentOSB .ssh]$ rsync -av authorized_keys 192.168.1.102:/home/transport/.ssh/
……
[email protected]'s password:
输入密码
三、在主机A
8)         追加A的密钥到刚才从主机B传过来的authorized_keys
[transport@CentOSA .ssh]$ cat id_rsa.pub >> authorized_keys
9)         传输追加好的文件(注意权限600)到B主机
[transport@CentOSA .ssh]$ rsync -av authorized_keys 192.168.1.104:/home/transport/.ssh/
到此基于SSH信任就配置完成了。以后主机A、B之间可以用transport用户传输文件。传输工具可以选择rsync等，并配置crontab周期性的备份。