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check the connectivity between the compute nodes you have, and check the rabbitmq-server logs, because if rabbit-mq fails during the vm's starting stage it will fail,if rabbit-mq is the problem restart the rabbit-mq service. if you changed the hostname, try to reset the rabbit-mq credentials. Or maybe The compute and controller nodes had FQDNs configured for their hostnames. The contents of /etc/hostname, and the value returned by hostname were FQDNs.If you have no data in tables,, dropping all the SQL tables for Nova, nova_api, and nova_cell0, and again sync the database and restart the service

sync commands

su -s /bin/sh -c "nova-manage api_db sync" nova

su -s /bin/sh -c "nova-manage db sync" nova

Verify nova cell0 and cell1 are registered correctly:

nova-manage cell_v2 list_cells

IN nova database there is a table compute node will there,in that table change mapped column's value form 0 to 1

In nova api-database host mapping table will there,you can manually map your hosts in that table