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There are many things that could be wrong here. I'll list a few to give you an idea.

  1. Image is not compatible with hypervisor. If using KVM make sure image is QCOW2.
  2. Make sure nova service-list has the compute node as enabled and up. If it is down you might need to restart the nova-compute service on the compute node and or make sure that you have your networking from controller to compute node configured correctly. Can you ping controller node from compute node?
  3. Check that rabbitmq is ok.
  4. Make sure your instance flavor requirements are below the limits of the compute node.
  5. Make sure libvirt is up on compute node.

These are some of the things that come to mind.