Using Lvs With Red Hat Cluster - Red Hat ENTERPRISE LINUX 4 - VIRTUAL SERVER ADMINISTRATION Manual

Appendix A. Using LVS with Red Hat
Cluster
You can use LVS routers with a Red Hat Cluster to deploy a high-availability e-commerce site that
provides load balancing, data integrity, and application availability.
Figure A.1, "LVS with a Red Hat Cluster"
The configuration in represents an e-commerce site used
for online merchandise ordering through a URL. Client requests to the URL pass through the firewall
to the active LVS load-balancing router, which then forwards the requests to one of the Web servers.
The Red Hat Cluster nodes serve dynamic data to the Web servers, which forward the data to the
requesting client.
Figure A.1. LVS with a Red Hat Cluster
Figure A.1,
Serving dynamic Web content with LVS requires a three-tier configuration (as shown in
"LVS with a Red Hat Cluster"). This combination of LVS and Red Hat Cluster allows for the
configuration of a high-integrity, no-single-point-of-failure e-commerce site. The Red Hat Cluster can
run a high-availability instance of a database or a set of databases that are network-accessible to the
Web servers.
49