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High Availability != High-cost
Norman Maurer discusses how to build low-cost master/slave clusters on Linux using Linux-HA (Heartbeat and DRBD) to provide high availability for mission critical services. Linux-HA allows configuring clusters that can failover services between nodes to ensure availability. DRBD replicates data between nodes, while Heartbeat monitors nodes and fails over services if needed. Configuring DRBD, Heartbeat, and associated scripts allows building clusters for services like Apache HTTPD, databases, mail servers, and more.
