Change the size of your server¶

Change the size of a server by changing its flavor.

1. 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 (397e71...  |
   | private network                     | 10.0.0.3                            |
   | hostId                              | 6e1e69b71ac9b1e6871f91e2dfc9a9b9... |
   | 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 ima...|
   | 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).

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       | 1    | 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     |
   +-----+-----------+-----------+------+-----------+------+-------+-------------+----------+
   

3. To resize the server, use the nova resize command and add the server ID or name and the new flavor. Include the --poll parameter to display the resize progress. For example:

     $ nova resize myCirrosServer 4 --poll
   
   Instance resizing... 100% complete
   Finished
   

   Note

   By default, the nova resize command gives the guest operating system a chance to perform a controlled shutdown before the instance is powered off and the instance is resized. The shutdown behavior is configured by the shutdown_timeout parameter that can be set in the nova.conf file. Its value stands for the overall period (in seconds) a guest operation system is allowed to complete the shutdown. The default timeout is 60 seconds. See Description of Compute configuration options for details.

   The timeout value can be overridden on a per image basis by means of os_shutdown_timeout that is an image metadata setting allowing different types of operating systems to specify how much time they need to shut down cleanly.

4. Show the status for your server.

   $ nova list
   +----------------------+----------------+--------+-----------------------------------------+
   | ID                   | Name           | Status | Networks                                |
   +----------------------+----------------+--------+-----------------------------------------+
   | 84c6e57d-a6b1-44b... | myCirrosServer | RESIZE | private=172.16.101.6, public=10.4.113.6 |
   +----------------------+----------------+--------+-----------------------------------------+
   

   When the resize completes, the status becomes VERIFY_RESIZE.

5. Confirm the resize,for example:

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

   The server status becomes ACTIVE.

6. If the resize fails or does not work as expected, you can revert the resize. For example:

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

   The server status becomes ACTIVE.