One of the many use cases for DRBD® replication technology is to replicate a device that backs a storage volume that is in a backing storage role for a KVM virtual machine (VM) image. You can use this replication strategy, with Pacemaker configured as the cluster manager, to create a high-availability (HA) KVM virtualization solution.
After a failover event, Pacemaker will make available an up-to-date (thanks to DRBD) copy of the active KVM domain on a peer node in the cluster. This solution also makes it possible to migrate a KVM domain from one cluster node to another, using a single pcs resource move command!
LINBIT® has recently updated a how-to technical guide with instructions on setting this solution up in a two-node cluster environment running Red Hat Enterprise Linux (RHEL) 9 or AlmaLinux 9
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