[root@controller ~(keystone_admin)]# glance image-create --name "Test5" --disk-format qcow2 --container-format bare --visibility public --file cirros-0.3.4-x86_64-disk.qcow2
+------------------+--------------------------------------+
| Property         | Value                                |
+------------------+--------------------------------------+
| checksum         | 56730d3091a764d5f8b38feeef0bfcef     |
| container_format | bare                                 |
| created_at       | 2017-09-19T13:48:01Z                 |
| disk_format      | qcow2                                |
| id               | ab96b1ad-1c87-4900-a5aa-9b63ac3e7284 |
| min_disk         | 0                                    |
| min_ram          | 0                                    |
| name             | Test5                                |
| owner            | df503b76d47b4bc1bbbcf14e8a68c5a8     |
| protected        | False                                |
| size             | 41126400                             |
| status           | active                               |
| tags             | []                                   |
| updated_at       | 2017-09-19T13:48:07Z                 |
| virtual_size     | None                                 |
| visibility       | public                               |
+------------------+--------------------------------------+

===================================================================================================
[root@ceph-server ~]# rbd ls images -l
NAME                                        SIZE PARENT FMT PROT LOCK
ab96b1ad-1c87-4900-a5aa-9b63ac3e7284      40162k          2
ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap 40162k          2 yes
[root@ceph-server ~]# rbd resize --size 20 --allow-shrink images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284
Resizing image: 100% complete...done.
[root@ceph-server ~]# rbd ls images -l
NAME                                        SIZE PARENT FMT PROT LOCK
ab96b1ad-1c87-4900-a5aa-9b63ac3e7284      20480k          2
ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap 40162k          2 yes
[root@ceph-server ~]# rbd snap create images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap1
[root@ceph-server ~]# rbd snap remove images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap1
[root@ceph-server ~]# rbd snap remove images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap
rbd: snapshot 'snap' is protected from removal.
2017-09-19 19:21:03.011080 7fcb6d154d80 -1 librbd::Operations: snapshot is protected
[root@ceph-server ~]# rbd snap unprotect images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap
[root@ceph-server ~]# rbd snap remove images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap
[root@ceph-server ~]# rbd snap create images/ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap
[root@ceph-server ~]# rbd ls images -l
NAME                                        SIZE PARENT FMT PROT LOCK
ab96b1ad-1c87-4900-a5aa-9b63ac3e7284      20480k          2
ab96b1ad-1c87-4900-a5aa-9b63ac3e7284@snap 20480k          2
[root@ceph-server ~]#
=================================================================================

[root@controller ~(keystone_admin)]# glance image-download ab96b1ad-1c87-4900-a5aa-9b63ac3e7284 --file /root/debashis7   <================ CLI is hanged during download
^C... terminating glance client