Editing Category:Spectranet (section)

==Spectra PCS cluster failover process. - Tetra Support Staff - Manish Singh==

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'''Video summary:''' Live demo of the PCS cluster failover process for Spectranet's Nagios monitoring server. Before failing over, checks that DRBD (application data) and MySQL master-slave replication are fully synced between the two nodes. Failover itself is done by putting the currently-active node into standby (`pcs node standby`), which cleanly stops its services in order (Apache, cron, NPCD, Nagios) while the other node starts the same services and takes over the virtual IP -- verified both from the Nagios admin panel and from the backend PCS/fencing status. Demonstrates the failover in both directions (node 2 to node 1, then back), including running a manual `resource cleanup` when one stop step reported a failure. Confirms the web interface stays reachable throughout via the shared virtual IP.