My Overcloud deploy does not have any VM images associates with it. I want to test launching a VM.

Get the VM from Centos:

curl -O  http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2.xz
unxz < CentOS-7-x86_64-GenericCloud.qcow2.xz >CentOS-7-x86_64-GenericCloud.qcow2
glance --os-image-api-version 2 image-create --name 'CentOS-7-x86_64-GenericCloud' --disk-format qcow2 --container-format bare --file CentOS-7-x86_64-GenericCloud.qcow2

Wait for that to finish, and check with

$ openstack image list
+--------------------------------------+------------------------------+--------+
| ID                                   | Name                         | Status |
+--------------------------------------+------------------------------+--------+
| 06841fb4-df1c-458d-898e-aea499342905 | CentOS-7-x86_64-GenericCloud | active |
+--------------------------------------+------------------------------+--------+

Now launch it:

openstack server create --flavor m1.small --image CentOS-7-x86_64-GenericCloud testrun

And it becomes active pretty quickly:

$ openstack server list
+--------------------------------------+---------+--------+----------+
| ID                                   | Name    | Status | Networks |
+--------------------------------------+---------+--------+----------+
| 76585723-e2c3-4acb-88d5-837b69000f72 | testrun | ACTIVE |          |
+--------------------------------------+---------+--------+----------+

It has no network capability. To Destroy:

openstack server delete 76585723-e2c3-4acb-88d5-837b69000f72