(2)Ubuntu配置SSH免密码登陆

1. 安装SSH：

$ sudo apt-get install ssh

2. 查看是否生成目录.ssh：

$ ls -al /home/xsj/

3. 如果没有，手动创建目录.ssh：

$ mkdir /home/xsj/.ssh

4. 生成公、私密钥：

$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa

或

$ ssh-keygen -t rsa

5. 将公钥加到用于认证的公钥文件中：

$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

或

cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

6. 验证是否SSH安装成功：

$ ssh -version

7. 免密码登陆：

$ ssh localhost

Linux xsj-virtual-machine 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 GNU/Linux

Ubuntu 10.10

Welcome to Ubuntu!

 * Documentation:  https://help./

New release 'natty' available.

Run 'do-release-upgrade' to upgrade to it.

Last login: Wed May 23 21:26:46 2012 from xsj-virtual-machine