Change the size of your server

Show information about your server, including its size, which is shown as the value of the flavor property.

$ nova show myCirrosServer
        +-------------------------------------+----------------------------------------------------------------+
| Property                            | Value                                                          |
+-------------------------------------+----------------------------------------------------------------+
| status                              | ACTIVE                                                         |
| updated                             | 2013-07-18T15:08:20Z                                           |
| OS-EXT-STS:task_state               | None                                                           |
| OS-EXT-SRV-ATTR:host                | devstack                                                       |
| key_name                            | None                                                           |
| image                               | cirros-0.3.2-x86_64-uec (397e713c-b95b-4186-ad46-6126863ea0a9) |
| private network                     | 10.0.0.3                                                       |
| hostId                              | 6e1e69b71ac9b1e6871f91e2dfc9a9b9ceca0f05db68172a81d45385       |
| OS-EXT-STS:vm_state                 | active                                                         |
| OS-EXT-SRV-ATTR:instance_name       | instance-00000005                                              |
| OS-EXT-SRV-ATTR:hypervisor_hostname | devstack                                                       |
| flavor                              | m1.small (2)                                                   |
| id                                  | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5                           |
| security_groups                     | [{u'name': u'default'}]                                        |
| user_id                             | 376744b5910b4b4da7d8e6cb483b06a8                               |
| name                                | myCirrosServer                                                 |
| created                             | 2013-07-18T15:07:59Z                                           |
| tenant_id                           | 66265572db174a7aa66eba661f58eb9e                               |
| OS-DCF:diskConfig                   | MANUAL                                                         |
| metadata                            | {u'description': u'Small test image', u'creator': u'joecool'}  |
| accessIPv4                          |                                                                |
| accessIPv6                          |                                                                |
| progress                            | 0                                                              |
| OS-EXT-STS:power_state              | 1                                                              |
| OS-EXT-AZ:availability_zone         | nova                                                           |
| config_drive                        |                                                                |
+-------------------------------------+----------------------------------------------------------------+

The size (flavor) of the server is m1.small (2).

List the available flavors with the following command:

$ nova flavor-list
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name      | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| 1  | m1.tiny   | 512       | 0    | 0         |      | 1     | 1.0         | True      |
| 2  | m1.small  | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 3  | m1.medium | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
| 4  | m1.large  | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 5  | m1.xlarge | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+

To resize the server, pass the server ID or name and the new flavor to the nova resize command. Include the --poll parameter to report the resize progress.

$ nova resize myCirrosServer 4 --poll

Instance resizing... 100% complete
Finished   

Show the status for your server:

$ nova list
+--------------------------------------+----------------+--------+-----------------------------------------+
| ID                                   | Name           | Status | Networks                                |
+--------------------------------------+----------------+--------+-----------------------------------------+
| 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 | myCirrosServer | RESIZE | private=172.16.101.6, public=10.4.113.6 |
+--------------------------------------+----------------+--------+-----------------------------------------+

When the resize completes, the status becomes VERIFY_RESIZE.

Confirm the resize:

$ nova resize-confirm 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5

The server status becomes ACTIVE.

If the resize fails or does not work as expected, you can revert the resize:

$ nova resize-revert 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5

The server status becomes ACTIVE.