1.8.2. Three-Tier LVS Topology

图 1.21 “Three-Tier LVS Topology” shows a typical three-tier LVS configuration. In the example, the active LVS router routes the requests from the public network (Internet) to the second tier — real servers. Each real server then accesses a shared data source of a Red Hat cluster in the third tier over the private network.

这​​​​​​​种​​​​​​​拓​​​​​​​扑​​​​​​​结​​​​​​​构​​​​​​​适​​​​​​​合​​​​​​​于​​​​​​​繁​​​​​​​忙​​​​​​​的​​​​​​​ FTP 服​​​​​​​务​​​​​​​器​​​​​​​，其​​​​​​​可​​​​​​​访​​​​​​​问​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​存​​​​​​​储​​​​​​​在​​​​​​​中​​​​​​​央​​​​​​​的​​​​​​​、​​​​​​​高​​​​​​​可​​​​​​​用​​​​​​​的​​​​​​​服​​​​​​​务​​​​​​​器​​​​​​​上​​​​​​​，而​​​​​​​每​​​​​​​个​​​​​​​真​​​​​​​实​​​​​​​服​​​​​​​务​​​​​​​器​​​​​​​都​​​​​​​通​​​​​​​过​​​​​​​导​​​​​​​出​​​​​​​的​​​​​​​ NFS 目​​​​​​​录​​​​​​​或​​​​​​​ Samba 共​​​​​​​享​​​​​​​访​​​​​​​问​​​​​​​该​​​​​​​服​​​​​​​务​​​​​​​器​​​​​​​。​​​​​​​我​​​​​​​们​​​​​​​也​​​​​​​推​​​​​​​荐​​​​​​​在​​​​​​​访​​​​​​​问​​​​​​​用​​​​​​​于​​​​​​​事​​​​​​​务​​​​​​​的​​​​​​​中​​​​​​​央​​​​​​​的​​​​​​​、​​​​​​​高​​​​​​​可​​​​​​​用​​​​​​​性​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​库​​​​​​​的​​​​​​​网​​​​​​​站​​​​​​​上​​​​​​​应​​​​​​​用​​​​​​​这​​​​​​​种​​​​​​​拓​​​​​​​扑​​​​​​​结​​​​​​​构​​​​​​​。​​​​​​​此​​​​​​​外​​​​​​​，在​​​​​​​ Red Hat 群​​​​​​​集​​​​​​​中​​​​​​​使​​​​​​​用​​​​​​​ active-active 配​​​​​​​置​​​​​​​，您​​​​​​​可​​​​​​​以​​​​​​​配​​​​​​​置​​​​​​​高​​​​​​​可​​​​​​​用​​​​​​​性​​​​​​​的​​​​​​​群​​​​​​​集​​​​​​​来​​​​​​​同​​​​​​​时​​​​​​​行​​​​​​​使​​​​​​​这​​​​​​​个​​​​​​​两​​​​​​​种​​​​​​​功​​​​​​​能​​​​​​​。​​​​​​​