In this chapter, you read about how you can use the Linux Heartbeat software to make Linux services highly available. As you saw, setting up a cluster involves much more than just setting up the Heartbeat environment. You learned how to set up a shared storage device using DRBD or iSCSI. You learned what the role of the file system is in this, and regarding this, you saw how to set up an OCFS2 volume. You also read how to create cluster resources, both if using Heartbeat 1 functionality or Heartbeat 2 features. Also, I described how you can use Stonith to avoid split-brain situations on the cluster. In the next chapter, you will learn how to configure the SUSE Linux firewall on your server.
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