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• The Cluster Service is used to operate a passive cluster of JOC Cockpit instances and to perform fail-over and switch-over operations between cluster members.
• All other JS7 - Services depend on the Cluster Service in order to be started for the active JOC Cockpit instance.

Fail-over

Any running JOC Cockpit instances which are running and connected to the same JS7 - Database implement a passive cluster. The active cluster member runs the Cluster Service, any passive cluster members watch for the active cluster members' ongoing operation by checking its heartbeats. In case of failure of the active cluster member one of the passive cluster members will become active and will start its Cluster Service.

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The switch-over operation is technically similar to the fail-over operation, however, switch-over is caused by the GUI or by the API and allows the Cluster Service to normally stop any background services that which are running.

Configuration

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• The Cluster Service logs general messages, warnings and errors to in the joc.log file.
• More detailed information in addition is additionally logged to in the Main Log service-cluster.log file.
• In addition to the Main Log, detailed debug information is logged to in the Debug Log service-cluster-debug.log file.
• For details see see the JS7 - Log Files and Locations article.