How to Build a High-Availability Cluster with DRBD and Keepalived

 

The Danger of Single Points of Failure When hosting mission-critical databases, ecommerce platforms, or enterprise software on a dedicated server, relying on a single machine is a massive gamble. Drive crashes, motherboard failures, or sudden network drops can destroy uncommitted data and create hours of downtime.

While database-level replication (like MySQL Master-Slave or Galera) is popular, it is notoriously difficult to manage and useless if underlying system files or configurations are corrupted.

The Solution: Enterprise "Network RAID 1" To achieve enterprise redundancy without expensive Storage Area Network (SAN) hardware, system administrators use DRBD (Distributed Replicated Block Device) combined with Keepalived.

DRBD operates directly at the kernel block level. Every byte written to the raw storage of your Primary node is synchronously replicated over EPY Host's internal private network to a Secondary standby node using DRBD's Protocol C.

Automating Failover with Keepalived Replication is only half the battle—you also need automated failover. Keepalived uses Virtual Router Redundancy Protocol (VRRP) to assign a shared Floating IP (VIP) to your primary server.

If the Primary server crashes:

  1. Keepalived detects the loss of heartbeat pulses.

  2. The Floating IP instantly migrates to the Secondary node.

  3. Keepalived executes custom event scripts to promote DRBD on the backup server to Primary, mounts the file system, and starts your applications.

Build Your HA Cluster Today Step through our complete engineering walkthrough on EPY Host and build a bulletproof cluster with Ubuntu or AlmaLinux: 🔗 https://www.epyhost.com/tutorials/howto/build-ha-cluster-drbd-keepalived/

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