Installing DRBD on two Linux servers
In this recipe, we will take two freshly installed CentOS 5.3 servers and configure DRBD to synchronize a LVM logical volume on both nodes, running MySQL. We will demonstrate how to manually failover the service.
Getting ready
Ensure that both nodes are freshly installed and, if possible, have a clean kernel. When you install MySQL, ensure that you are not allocating all of the space to the / logical volume (the default in the CentOS / RHEL installer Anaconda). You can either create the LVM logical volume that DRBD will use during setup, or leave the space unallocated in a volume group and create the logical volume later. You can check the space available in a volume group using the vgs command:
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