When you launch vms, nova scheduler determines what hosts to add the VMs to depending on the criteria you have defined in the schedule filter.

To assign vms to a particular host, you can specify the host using the availability zone option in the nova boot command.

$ nova boot --image <image-id> --flavor <flavor-id> <vm-name> --availability-zone <availability-zone> Where <availability-zone> is zone:host as seen in you $ nova service-list

If you want to create a Instances on Compute node use this command.

$ nova boot --image <image-id> --flavor <flavor-id> <vm-name>

this command will creatre vms on compute node.

now, you can see vms in

$ nova list