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什么是VNC？什么是IPMI？ 他们有什么区别？

什么是VNC?


　　VNC (Virtual Network Console)是虚拟网络控制台的缩写。它 是一款优秀的远程控制工具软件,由著名的 AT&T 的欧洲研究实验室开发的。VNC 是在基于 UNIX 和 Linux 操作系统的免费的开源软件,远程控制能力强大,高效实用,其性能可以和 Windows 和 MAC 中的任何远程控制软件媲美。 在 Linux 中,VNC 包括以下四个命令:vncserver,vncviewer,vncpasswd,和 vncconnect。大多数情况下用户只需要其中的两个命令:vncserver 和 vncviewer。


　　VNC工作原理流程:


　　(1) 在服务器端启动 VNC Server。


　　(2) VNC客户端通过浏览器或 VNC Viewer 连接至VNC Server。


　　(3) VNC Server传送一对话窗口至客户端,要求输入连接密码, 以及存取的VNC Server显示装置。


　　(4) 在客户端输入联机密码后,VNC Server验证客户端是否具有存取权限。


　　(5) 若是客户端通过 VNC Server 的验证,客户端即要求VNC Server显示桌面环境。


　　(6) VNC Server通过X Protocol 要求X Server将画面显示控制权交由VNC Server负责。


　　(7) VNC Server将来由 X Server 的桌面环境利用VNC通信协议送至客户端, 并且允许客户端控制VNC Server的桌面环境及输入装置。


　　什么是IPMI?


　　智能平台管理接口(IPMI)是一种开放标准的硬件管理接口规格,定义了嵌入式管理子系统进行通信的特定方法。IPMI信息通过基板管理控制器(BMC)(位于IPMI规格的硬件组件上)进行交流。使用低级硬件智能管理而不使  用操作系统进行管理,具有两个主要优点:首先,此配置允许进行带外服务器管理;其次,操作系统不必负担传输系统状态数据的任务。


　　IPMI核心是一个专用芯片/控制器(叫做服务器处理器或基板管理控制器(BMC)),是一个单独在系统内运行的无代理管理子系统,只要有BMC与IPMI固件其便可开始工作,而BMC通常是一个安装在服务器主板上的独立的板卡  ,现在也有服务器主板提供对IPMI支持的。IPMI监视服务器的物理健康特征,如温度、电压、风扇工作状态、电源状态等。

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