[Cloud Computing]Mechanisms: Virtual Firewall

本文介绍了虚拟防火墙的概念及其在保护虚拟服务器中的作用。虚拟防火墙作为一款运行在虚拟服务器上的软件,可以有效过滤并控制进出虚拟服务器的通信。文中还讨论了虚拟服务器的安全需求,包括加密虚拟磁盘内容及禁用不必要的服务。

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Virtual Firewall

A virtual firewall is a virtual appliance (virtual software) running as a virtual server that controls and filters communication to virtual servers, from virtual servers, and between virtual servers. Virtual servers need to be protected via physical and virtual firewalls. The data, virtual servers, LUNs and networks of different cloud consumers need to be isolated so that they cannot access each other's services.

Virtual servers are similar to physical servers in that they also require protection and security, although they have additional requirements:

  • Encryption mechanisms need to be used to protect the virtual servers' disk content. This prevents someone who has gained access to the virtual disk file from being able to access the actual data stored inside the virtual disk file.
  • Unnecessary services need to be disabled.
  • Virtual servers can be deployed from a hardened virtual server image.

In Figure 1, a virtual firewall and three virtual servers are hosted on the same hypervisor. Traffic is received and inspected by the virtual firewall before being forwarded to and from the virtual servers.

Figure 1 - A virtual firewall example.

Related Patterns:

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