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CentOS High Availability by Mitja Resman

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Chapter 14. Two-node Cluster Considerations on CentOS 7

In previous chapters, you learned what high availability is all about and how to achieve it. You also learned how to install and configure a three-node cluster on CentOS 7. A guide to high availability on CentOS 7 cannot be complete without mentioning considerations for a two-node cluster configuration. In this chapter, you will learn the downsides of using a two-node cluster configuration and workarounds for these issues.

Quorum in a two-node cluster

You learned about quorum in Chapter 2, Meet the Cluster Stack on CentOS. Quorum is the minimum number of cluster member votes required to perform a cluster operation. Without Quorum, the cluster cannot operate. Quorum is achieved when the majority ...

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