1.2. A Three-Tier LVS Configuration

图 1.2 “A Three-Tier LVS Configuration” shows a typical three-tier LVS topology. In this example, the active LVS router routes the requests from the Internet to the pool of real servers. Each of the real servers then accesses a shared data source over the network.

此​​​​​​​配​​​​​​​置​​​​​​​对​​​​​​​于​​​​​​​繁​​​​​​​忙​​​​​​​的​​​​​​​ FTP 服​​​​​​​务​​​​​​​器​​​​​​​最​​​​​​​合​​​​​​​适​​​​​​​，服​​​​​​​务​​​​​​​器​​​​​​​中​​​​​​​可​​​​​​​访​​​​​​​问​​​​​​​的​​​​​​​数​​​​​​​据​​​​​​​都​​​​​​​被​​​​​​​保​​​​​​​存​​​​​​​在​​​​​​​一​​​​​​​个​​​​​​​集​​​​​​​中​​​​​​​的​​​​​​​高​​​​​​​度​​​​​​​可​​​​​​​用​​​​​​​的​​​​​​​服​​​​​​​务​​​​​​​器​​​​​​​中​​​​​​​，且​​​​​​​每​​​​​​​个​​​​​​​真​​​​​​​实​​​​​​​服​​​​​​​务​​​​​​​器​​​​​​​都​​​​​​​可​​​​​​​通​​​​​​​过​​​​​​​一​​​​​​​个​​​​​​​导​​​​​​​出​​​​​​​的​​​​​​​ NFS 目​​​​​​​录​​​​​​​或​​​​​​​者​​​​​​​ Samba 共​​​​​​​享​​​​​​​访​​​​​​​问​​​​​​​这​​​​​​​些​​​​​​​数​​​​​​​据​​​​​​​。​​​​​​​我​​​​​​​们​​​​​​​还​​​​​​​推​​​​​​​荐​​​​​​​在​​​​​​​使​​​​​​​用​​​​​​​集​​​​​​​中​​​​​​​、​​​​​​​高​​​​​​​度​​​​​​​可​​​​​​​用​​​​​​​数​​​​​​​据​​​​​​​库​​​​​​​进​​​​​​​行​​​​​​​传​​​​​​​送​​​​​​​的​​​​​​​网​​​​​​​站​​​​​​​使​​​​​​​用​​​​​​​此​​​​​​​布​​​​​​​局​​​​​​​。​​​​​​​另​​​​​​​外​​​​​​​，使​​​​​​​用​​​​​​​Red Hat Cluster Manager的​​​​​​​ active-active 配​​​​​​​置​​​​​​​，管​​​​​​​理​​​​​​​员​​​​​​​可​​​​​​​配​​​​​​​置​​​​​​​一​​​​​​​个​​​​​​​高​​​​​​​度​​​​​​​可​​​​​​​用​​​​​​​的​​​​​​​群​​​​​​​集​​​​​​​来​​​​​​​同​​​​​​​时​​​​​​​扮​​​​​​​演​​​​​​​这​​​​​​​两​​​​​​​个​​​​​​​角​​​​​​​色​​​​​​​。​​​​​​​

上​​​​​​​面​​​​​​​示​​​​​​​例​​​​​​​中​​​​​​​提​​​​​​​到​​​​​​​的​​​​​​​第​​​​​​​三​​​​​​​层​​​​​​​不​​​​​​​一​​​​​​​定​​​​​​​要​​​​​​​使​​​​​​​用​​​​​​​Red Hat Cluster Manager，但​​​​​​​无​​​​​​​法​​​​​​​使​​​​​​​用​​​​​​​高​​​​​​​度​​​​​​​可​​​​​​​用​​​​​​​解​​​​​​​决​​​​​​​方​​​​​​​案​​​​​​​会​​​​​​​导​​​​​​​致​​​​​​​严​​​​​​​重​​​​​​​的​​​​​​​单​​​​​​​点​​​​​​​失​​​​​​​败​​​​​​​。​​​​​​​