Configure Auto-Start for Instances After Host Reboot

Problem

When a compute host is rebooted, regardless of the reason, Nova is configured by default to leave all instances on that hypervisor in a shutoff state. If this behavior is considered undesirable, an optional Nova configuration option can be set on a per-host basis to automatically start guests that were running before the host rebooted.

Environment

• Platform9 Managed OpenStack - All Versions
• Nova

Procedure

1. Set the following on each host where this behavior is desired in the /opt/pf9/etc/nova/conf.d/nova_override.conf file.

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[DEFAULT]resume_guests_state_on_host_boot = True

2. Restart the Compute service.

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# systemctl restart pf9-ostackhost

Additional Information

For more details on this option, refer to the OpenStack Docs - Nova - Configuration Options.