Distributed load solution for Web Application Server cluster system

&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; The Web application server cluster system is a cluster system composed of a group of servers running the same Web application at the same time, which looks like a server to the outside world. In order to balance the load of cluster server and to optimize the performance of the system, the cluster server distributed many requests to different nodes in the system. This enables greater effectiveness and stability, which is what web-based enterprise applications must have.

Two ways to compute the load on a Web server

The Web application server cluster system is a cluster system composed of a group of servers running the same Web application at the same time, which looks like a server to the outside world. In order to balance the load of cluster server and to optimize the performance of the system, the cluster server distributed many requests to different nodes in the system. This enables greater effectiveness and stability, which is what web-based enterprise applications must have.

High reliability can be seen as a redundancy setting for the system. For a specific request, if the requested server can not be processed, then other servers can be effective processing it? For an efficient system, if a Web server fails, the other server can immediately replace its location, processing the requested request, And this process for users, to be as transparent as possible, so that users do not perceive!

Stability determines whether an application can support a growing number of user requests, which is a capability of the application itself. Stability is an effective measure of many factors affecting system performance, including the maximum number of users that can be supported by the cluster system and the time required to process a request.

Among the many existing methods of balancing server load, the following two methods are widely studied and used:

DNS Load Balancing Method Rr-dns (Robin Domain Name System)

Load Balancer

Below, we will discuss the two approaches.