Load balancing method, device and system of server

Abstract

The invention provides a load balancing method, a load balancing device and a load balancing system of a server to achieve load balancing over a network segment by a linux virtual server (LVS). Three-layer interconnection is adopted between the LVS and a real server (RS); and the LVS is subjected to conversion of a source address and a target address from a client and a data packet received by the real server, thus, the LVS can serve many different network segments of RSs. A real sense of cross-network segment load balance is achieved in a three-layer interconnection manner; and the quantity of RSs capable of providing service on the LVS is not limited, so that hierarchical network topology can be expanded. Furthermore, configuration and operation maintenance of the LVS and RS are simplified.

Description

technical field [0001] The present application relates to load balancing technology, in particular to a server load balancing method, device and system. Background technique [0002] In Internet application technology, load balancing has always been a hot topic, and LVS load balancing is one of the load balancing technologies. The full English name of LVS is Linux Virtual Server, that is, Linux virtual server. LVS is mainly used for multi-server load balancing, works at the network layer, and can realize high-performance and high-availability server cluster technology. [0003] The system structure of LVS load balancing is as follows: figure 1 As shown, it mainly includes a client (Client), a virtual server (LVS) and a real server (Real Server, RS for short). Among them, the main function of LVS is to provide packet forwarding and load balancing. LVS uses a virtual IP (vip) for external access. When a user accesses vip, it arrives at LVS. LVS selects an RS according to ce...

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Problems solved by technology

[0008] In the above three working modes, LVS and the back-end RS need two-layer interconnection, that is, LVS and RS are in the same network segment and use two-layer protocol communication. The resulting problem is that it limits LVS and RS LVS cannot provide services for RSs across network segments, and can only use a relatively flat network topology, which greatly limits the network topology

[0012] This way of tagging on the LVS network card can make LVS serve RSs in multiple network segments, but the ports on the same router / switch are relatively limited, which limits the number of RSs that can provide services on LVS

Moreover, there is still a two-layer interconnection between LVS and RS, and no real cross-network segment service has been realized.

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