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CentOS High Availability by Mitja Resman

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A theoretical cluster service example

In order to make it easy for you to understand the cluster service, you will be presented with a theoretical example of a two-node active/passive computer cluster providing a website cluster service. The active/passive cluster configuration only provides operational cluster services on the master cluster member at a given time, while the secondary cluster member waits on standby to take over if there is a master node failure. If the currently active cluster member fails, the cluster resources will be relocated and recovered on the operational secondary cluster member.

The following resources are required to run a simple website:

  • IP address—web server
  • Database server
  • Shared storage solution

All the listed resources ...

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