Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Installation Guide download pdf (Page 37)

Chapter 1. Red Hat Cluster Suite Overview 27

of the active LVS router. During failover, the backup LVS router takes over the VIP ad-

dresses serviced by the failed router using a technique known as ARP spooﬁng — where

the backup LVS router announces itself as the destination for IP packets addressed to the

failed node. When the failed node returns to active service, the backup LVS router assumes

its backup role again.

The simple, two-tier conﬁguration in Figure 1-20 is suited best for clusters serving data

that does not change very frequently — such as static web pages — because the individual

real servers do not automatically synchronize data among themselves.

1.8.2. Three-Tier LVS Topology

Figure 1-21 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.

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Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Installation Guide Page 37