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If you add the following option to your nova.conf file then when nova-compute restarts (at boot or simple on a restart) it will check the instances in the DB and attempt to start any instances that are marked as running in the DB but not running on the hypervisor.

resume_guests_state_on_host_boot=True

> On May 21, 2015, at 21:16, Lily.Sing <lily.sing at gmail.com> wrote:
> 
> Hi experts,
> 
> I setup an OpenStack multinode environment without Horizon installed. After host rebooting, the instances are in 'shutoff' status. I hope to re-use these instances, but seems there is no command line for this. Any suggestion?
> 
> Thanks.
> 
> Best regards,
> Lily Xing(邢莉莉)
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