We should add a section here that uses the overcloud-full-qcow2 image for testing, before generating a custom user image:
~~~
(overcloud) [stack@undercloud-0 ~]$ tar -xf /usr/share/rhosp-director-images/overcloud-full-latest.tar -C images2/
(overcloud) [stack@undercloud-0 ~]$ ls images2
overcloud-full.initrd  overcloud-full.qcow2  overcloud-full-rpm.manifest  overcloud-full-signature.manifest  overcloud-full.vmlinuz
(overcloud) [stack@undercloud-0 ~]$ cd images2
(overcloud) [stack@undercloud-0 images2]$ ll
total 1557048
-rw-r--r--. 1 stack stack   67300366 Dec  6 11:50 overcloud-full.initrd
-rw-r--r--. 1 stack stack 1520173056 Dec  6 12:02 overcloud-full.qcow2
-rw-r--r--. 1 stack stack      56026 Dec  6 11:59 overcloud-full-rpm.manifest
-rw-r--r--. 1 stack stack     146884 Dec  6 11:59 overcloud-full-signature.manifest
-rwxr-xr-x. 1 stack stack    6734128 Dec  6 11:50 overcloud-full.vmlinuz
(overcloud) [stack@undercloud-0 images2]$ KERNEL_ID=$(openstack image create \
>   --file overcloud-full.vmlinuz --public \
>   --container-format aki --disk-format aki \
>   -f value -c id overcloud-full.vmlinuz)
(overcloud) [stack@undercloud-0 images2]$ RAMDISK_ID=$(openstack image create \
>   --file overcloud-full.initrd --public \
>   --container-format ari --disk-format ari \
>   -f value -c id overcloud-full.initrd)
(overcloud) [stack@undercloud-0 images2]$ openstack image create \
>   --file overcloud-full.qcow2   --public \
>   --container-format bare \
>   --disk-format qcow2 \
>   --property kernel_id=$KERNEL_ID \
>   --property ramdisk_id=$RAMDISK_ID \
>   overcloud-full

~~~

Reported by: akaris

https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/bare_metal_provisioning/sect-configure#annotations:7f2dfa9e-7ed0-4568-9e2c-699d16836bbb