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CentOS High Performance by Gabriel Cánepa

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Chapter 3. A Closer Look at High Availability

In this chapter, we will look at the components of a high-availability cluster in greater detail than we were able to do initially during Chapter 1, Cluster Basics and Installation on CentOS 7; you may want to review that chapter in order to refresh your memory before proceeding further.

In this chapter, we will cover the following topics:

  • Failover—a premier on high availability and performance
  • Fencing — isolating the malfunctioning nodes
  • Split brain — preparing to avoid inconsistencies
  • Quorum — scoring inside your cluster
  • Configuring our cluster via PCS GUI

We will set out on this chapter by asking ourselves a few questions about how to achieve high availability, and we will attempt to get our answers as ...

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