Ảo hóa ứng dụng đầy đủ đòi hỏi một ảo hóa lớp ảo hóa phải được cài đặt trên máy tính để đánh chặn các tập tin và các hoạt động đăng ký thực hiện bởi một ứng dụng ảo hóa, nơi mà nó minh bạch có thể chuyển hướng những hoạt động để một điểm đến ảo hóa. Các ứng dụng thực | 98 Cloud Computing the virtual operating system and all related resources that are managed by it rather than an actual physical implementation of that operating system. Full application virtualization requires a virtualization 31 The virtualization layer must be installed on a machine to intercept file and registry operations performed by a virtualized application where it can transparently redirect those operations to a virtualized destination. The application that performs file operations never knows that it is not directly accessing a physical resource. Using this approach applications can be made portable by redirecting their I O tasks to a single physical file and traditionally incompatible applications can be executed side by side. Using application virtualization allows applications to run in nonnative environments. For example Wine allows Linux users to run Microsoft Windows applications from the Linux platform. Virtualization also helps protect the operating system and isolate other applications fr om poorly written or buggy code. With application virtualization physical resources can be shared so an implementation uses fewer resources than a separate virtual machine. Simplified operating system migrations are possible because administrators are able to maintain a standardized configuration in the underlying operating system and propagate that configuration across multiple servers in an organization regardless of whatever applications may be used. In the next few sections we will take a look at some of the more popular virtualization environments in use today. VMWare The VMware virtualization platform is built to virtualize hardware resources found on an x86-based computer . the CPU RAM hard disk and network controller to create a fully functional virtual machine that can run its own operating system and applications just like a standard computer. Each virtual machine is completely encapsulated in order to eliminate any potential conflicts. .
