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In general, "No Valid Host Was Found" error meesage is raised when not enough resources(vCUP, Mem, Storage, ...) are availabe to launch an instance on compute nodes. In other words, nova-scheduler can not find a compute node with enough resources(vcpu, disk, ram,...) to launch instance.

Make sure that your target compute node has enough virtual resources that your instance requested. For further details, check your scheduler(nova-scheduler.log) and nova-api(nova-api.log) log files and put the error messages in your post. Both files are stored at: