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Pro Linux High Availability Clustering by Sander van Vugt

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CHAPTER 11

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Use Case: Configuring a Load-Balanced Mail Front End with a Database Back End

Customer Situation

The configuration that is described in this chapter is part of the most complex cluster that I have ever created. In fact, it’s not just a cluster, it’s a group of clusters working together to provide a highly redundant environment that is used by medical doctors in France to access a web-based mailbox. In this chapter, I’m only discussing a part of the configuration, in which two clusters are working together to deliver e-mail.

The customer expected a substantial workload, so it wanted an environment that is not only redundant from the ...

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