You have several options for using clustering in a Linux environment. One of the most popular is the Linux-HA project. The software from this project, also known as Heartbeat, allows administrators to configure a high-availability cluster solution in which vital applications can fail over to another node when the node currently hosting them goes down. In this chapter, you will learn what high-availability clustering is. I'll cover the following topics:
• Introducing Linux clustering
• Designing a high-availability (HA) cluster
• Configuring shared storage for the clustered environment
• Configuring failover clustering with Heartbeat
• Shooting the other node in the head and the meatware device
• Configuring a Heartbeat 2-style cluster with YaST
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