云计算为e-Learing提供了更好的平台。现在多数e-Learning平台不能在公有或私有云平台与私有网络架构之间共享资源，一般需要花费额外代价去部署环境。本文提出了一种基于VPN和私有云的e-Learning架构，能帮助学生在低成本的情况下，轻松建立和配置自己的在线学习环境，高效分享资源。

本文主要工作分为如下三个方面：

（1）提出基于私有云的e-Learning的整体架构

该架构由私有云、在线学习、校园网络和VPN部分组成。通过开源软件实现私有云，并可在虚拟机上高效运行；e-Learning系统主要包括计算机科学课程虚拟机、备份系统以及管理用户账户的基于角色认证系统；并采用Eucalyptus结构和虚拟隧道完成交互功能。

（2）利用VPN将校园网与私有云进行集成

VPN为校园网和私有云之间的通信提供了专用网络。当有地址链接到VPN时，云管理员允许用户使用任意的IP地址去访问其中的资源而不用考虑冲突。虚拟私有云使用VPN来创建安全信道，消除了云计算和企业级组件中的复杂配置问题；把安全VPN链接扩展到了云架构虚拟机之中，e-Learning平台与其他位置的多平台之间的连接也变得可行和可扩展。说明了该架构能够允许本地网络与基于桉树（Eucalyptus）的带有VPN隧道的私有云之间的互通信。

（3）所提出架构的实现

 给出了架构搭建所需的软硬件环境并做出了整体部署策略；通过呈现节点控制器，集群控制器以及云控制器的所有配置展示了私有云架构的建立，并描述了在私有云架构中，图像管理、实例、卷和快照的创建。其中：e-Learning平台实现了基于角色的认证系统，用户账户通过轻量级目录访问协议存储在中心数据库中；在私有云域以服务器模式运行OpenVPN来实现VPN服务器，客户端以客户端模式运行OpenVPN，连接到服务器，从私有云内网获得路由，然后通过VPN隧道在内网中访问服务器。

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