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Please look at the nova-api.log and nova-scheduler.log. The NoValidHost error indicates that the scheduler was unable to locate a compute node with enough available vCPUs, RAM, or HDD space to host an instance of the selected flavour. Ensure that the nova-compute service is active on the compute node and that the compute node has enough available resources to host the instance being launched. Note that the baremetal-* commands are only relevant to users of the baremetal driver. Please look at the nova-api.log and nova-scheduler.log. Check whether rabbitmq is running on controller. Appropriate password set for rabbitmq in nova.conf on controller and compute. Compute should be connecting to rabitmq on controller itself. You can set the flag scheduler_default_filters=AllHostsFilter in nova.conf. Restart the all service on controller and compute.