Fencing in Cloud Enviroment ( pacemaker Azure)

This document (000020363) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Availability Extension 12

Situation

If not using SBD as Fence Device in a cloud environment, the following should used as fence action for shutdown:

stonith-action=off

Resolution

To set the option issue the following command:

crm configure property stonith-action=off

Cause

If one uses the reboot option in a cloud environment, the hypervisor will generally issue a graceful shutdown to the Guest which might show like

hv_utils: Shutdown request received - graceful shutdown initiated

A graceful OS shutdown in a cluster environment is not a good idea as the cluster node is out of control and likely to hang on this shutdown. Also, this means, in most cases, a controlled de-allocation by the hypervisor, which takes time and can lead to a timeout on the fence action for the fencing node, which would break the cluster.

Disclaimer

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