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High Availability of compute node's instances

My requirement is when a compute node fails due to some reason say power failure or something or an instance is not accessible to the user due to the network problem in compute node then those instances running on that compute node should come up with the same volumes on other compute nodes (in which physical resources are available). For Example we have given instances to the customers as IaaS only so highly availability is required for compute nodes so down time is very low and instances should come up automatically without any manual intervention. How can I achieved this in Openstack?