root@ian-devstack-glance:~# nova image-meta 
34763240-9a37-4891-ad37-c5861b1edee9 set key=value
root@ian-devstack-glance:~# nova image-show 
34763240-9a37-4891-ad37-c5861b1edee9
+----------------------+--------------------------------------+
| Property             | Value                                |
+----------------------+--------------------------------------+
| OS-EXT-IMG-SIZE:size | 4969360                              |
| created              | 2014-12-26T17:29:45Z                 |
| id                   | 34763240-9a37-4891-ad37-c5861b1edee9 |
| metadata key         | value                                |
| minDisk              | 0                                    |
| minRam               | 0                                    |
| name                 | cirros-0.3.2-x86_64-uec-kernel       |
| progress             | 100                                  |
| status               | ACTIVE                               |
| updated              | 2014-12-26T21:32:09Z                 |
+----------------------+--------------------------------------+
root@ian-devstack-glance:~# nova image-meta 
34763240-9a37-4891-ad37-c5861b1edee9 set key2='value\nnewline'
root@ian-devstack-glance:~# nova image-show 
34763240-9a37-4891-ad37-c5861b1edee9
+----------------------+--------------------------------------+
| Property             | Value                                |
+----------------------+--------------------------------------+
| OS-EXT-IMG-SIZE:size | 4969360                              |
| created              | 2014-12-26T17:29:45Z                 |
| id                   | 34763240-9a37-4891-ad37-c5861b1edee9 |
| metadata key         | value                                |
| metadata key2        | value                                |
|                      | newline                              |
| minDisk              | 0                                    |
| minRam               | 0                                    |
| name                 | cirros-0.3.2-x86_64-uec-kernel       |
| progress             | 100                                  |
| status               | ACTIVE                               |
| updated              | 2014-12-26T21:32:35Z                 |
+----------------------+--------------------------------------+