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Once the system hosting devstack installation is rebooted, you only need to execute the rejoin-stack.sh script (if you run stack.sh, it will recreate all the databases, thus losing data of all the images, users, instances, etc). The rejoin-stack.sh script will attempt starting all the services (that were earlier installed using the stack.sh). The users, images should still be available after the host reboots. Not sure about whether all the instances that were running as the system went down will be up again. PS: Some services like Cinder volume might not start right away after a reboot (since you need to create the volume group).