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"No valid host found error" is raised when your compute nodes have not enough resources to lunch an instance. When you issue create instance command, the nova-scheduler looks for host to find the best host with enough resources you requested. But when no host found, this error will be raised, as probably in your case.

"No valid host found error" is raised when your compute nodes have not enough resources to lunch an instance. When you issue create instance command, the nova-scheduler looks for host to find the best host with enough resources you requested. But when no host found, this error will be raised, as probably in your case.case. Check your host available resources(RAM, CPU, Disk).

"No valid host found error" is raised when your compute nodes have not enough resources to lunch an instance. When you issue create instance command, the nova-scheduler looks for host to find the best host with enough resources you requested. But when no host found, this error will be raised, as probably in your case. Check your host available resources(RAM, CPU, Disk).

Also check your nova-scheduler log file.