What is the Linux Virtual Server?

The Linux Virtual Server is a highly scalable and highly available server built on a cluster of real servers, with the load balancer running on the Linux operating system. The architecture of the server cluster is fully transparent to end users, and the users interact as if it were a single high-performance virtual server. For more information, click here.
Linux虚拟服务器是建立在真实服务器集群上的高度可扩展且高度可用的服务器，负载平衡器在Linux操作系统上运行。服务器集群的体系结构对最终用户是完全透明的，用户的交互就像它是单个高性能虚拟服务器一样。有关更多信息，请单击此处。

Applications of the Linux Virtual Server

The Linux Virtual Server as an advanced load balancing solution can be used to build highly scalable and highly available network services, such as scalable web, cache, mail, ftp, media and VoIP services.
Linux虚拟服务器作为高级负载平衡解决方案，可用于构建高度可扩展且高度可用的网络服务，例如可扩展的web，缓存，邮件，ftp，媒体和VoIP服务。

What is virtual server?

Virtual server is a highly scalable and highly available server built on a cluster of real servers. The architecture of server cluster is fully transparent to end users, and the users interact with the cluster system as if it were only a single high-performance virtual server. Please consider the following figure.
虚拟服务器是建立在真实服务器集群上的高度可扩展且高度可用的服务器。服务器集群的体系结构对最终用户是完全透明的，用户与集群系统的交互就像它只是单个高性能虚拟服务器一样。请考虑下图。

The real servers and the load balancers may be interconnected by either high-speed LAN or by geographically dispersed WAN. The load balancers can dispatch requests to the different servers and make parallel services of the cluster to appear as a virtual service on a single IP address, and request dispatching can use IP load balancing technolgies or application-level load balancing technologies. Scalability of the system is achieved by transparently adding or removing nodes in the cluster. High availability is provided by detecting node or daemon failures and reconfiguring the system appropriately.
实际服务器和负载平衡器可以通过高速LAN或地理上分散的WAN互连。负载均衡器可以将请求调度到不同的服务器，并使群集的并行服务在单个ip地址上显示为虚拟服务，并且请求调度可以使用IP负载平衡技术或应用程序级负载平衡技术。通过透明地添加或删除群集中的节点来实现系统的可伸缩性。通过检测节点或守护程序故障并适当地重新配置系统来提供高可用性。

Goals

The basic goal of the Linux Virtual Server Project is to:

The LVS cluster system is also known as load balancing server cluster.
LVS集群系统也称为负载平衡服务器集群。