用ssh连接的方式访问virtual-box里面的虚拟机

0 安装ubuntu-server时，software selection时按tab键选择openssh-server

1 添加.bash_aliases(clear,ll -h，为了使用方便，非必须，与ssh登录也毫无关系)

2 Append the following lines at the end of the file /etc/network/interfaces:

auto eth1

iface eth1 inet dhcp

3 vim  /etc/ssh/sshd_config,找到PasswordAuthentication no， 改为yes保存

4 sudo poweroff。

5 In VirtualBox Manager, choose the VM, then click the Settings button in the tool bar. This will invoke a window for VM configuration.  
Select the Network category on the left.Select the Adapter 2 tab on the right.Enable "Adapter 2", and modify the Attached to attribute of Adapter 2 to Host-only Adapter. The Name attribute should become VirtualBox Host-Only Ethernet Adapter by default.
Now launch the VM

6 sudo ifconfig eth1，You should see some information about the network interface "eth1"。现在可以用类似“inet addr:192.168.56.102”这里面的ip地址加速putty连接virtualbox虚拟机里面的ubuntu-server了