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Release It! by Michael T. Nygard

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Virtual IP Addresses

images/general_design_issues/virtual_ip_failover.png
Figure 28. Virtual IP Address Migration

Believe it or not, not every application is written to run across a cluster. For whatever reason, these applications can be active on only one server at a time. How can you get high availability out of an application, without the redundancy of running it on multiple servers?

Cluster servers are the answer. A cluster server is an application that acts like a controller for other applications. A cluster server such as Veritas Cluster Server, HP ServiceGuard, or Microsoft Cluster Server[77] runs on multiple servers, collaborating across the servers to ensure that a specific “package” runs ...

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