1.安装virtualbox
	https://www.virtualbox.org/
2.安装centos6.6
3.配置网络
	右键-->网络-->网卡2-->host-only

	cd /etc/sysconfig/network-scripts/
	vi ifcfg-eth0
	将此处改为yes ONBOOT=yes
	此时可ping外网

	cp ifcfg-eth0 ifcfg-eth1
	加入以下内容
	DEVICE=eth1
	ONBOOT=yes
	BOOTPROTO=static
	IPADDR=192.168.56.101
	NETMASK=255.255.255.0

4.使用工具连接centos
	https://winscp.net/eng/download.php
	https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html