High availability: HAProxy, Keepalived, Pacemaker and Corosync
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Lesson 8 of 12 · Failover and clusters

Fencing (STONITH), resources and constraints in Pacemaker

55 min Rocky Linux 9 Versions Pacemaker 2.1, pcs 0.11 (Rocky 9), pcs 0.11 / crmsh 4.6 (Debian 12, Ubuntu 24.04)

Objective

Configure a safe Pacemaker cluster (one that never starts a service in two places), declare the resources of a highly available web service in it, and control where they run, when they move and when they stay.

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