Failovers, recovery tests and maintenance without downtime

50 min Debian 12 Versions HAProxy 2.4-3.0, Keepalived 2.2, Pacemaker 2.1

Objective

Turn an architecture that is “redundant in theory” into a proven one: know how to move a service without clients noticing, regularly test failure recovery while measuring the real RTO, and apply updates without a downtime window.

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