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CentOS High Availability by Mitja Resman

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Computer clusters

A computer cluster is a group of computers joined to work together in order to provide high availability of some services. The services are usually built with a number of applications operating in the so-called application layer. As shown in the example from the previous section, single points of failure are spread across all layers of a system design, and the application layer is one of the critical layers. It is usual for an application to encounter an error, or bug, and stop responding or crash. Such a situation will lead to service downtime and probably financial loss as well, so it is necessary to provide redundancy on the application layer also. This is the reason we need to implement a computer cluster solution into our ...

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