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You can change the size of an instance by changing its flavor. This rebuilds the instance and therefore results in a restart

Web Interface

1. 

In Web Interface Compute->Instances, select the VM you wish to resize

2.

Shut down the Instance and create a snapshot to prevent data loss.

3

Click the drop-down menu on the right-hand side (in Actions column) and select RESIZE INSTANCE

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4.

Select the new flavor from the drop-down menu in the pop-up.

Click on the RESIZE button

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Command Line

Get the serverID and flavorID 

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$ openstack server list
+--------------------------------------+--------------------------+---------+----------------------------------------+---------------------------------------------------------+--------------+
| ID                                   | Name                     | Status  | Networks                               | Image                                                   | Flavor       |
+--------------------------------------+--------------------------+---------+----------------------------------------+---------------------------------------------------------+--------------+
| b5acb398-76b4-48fe-9b9a-d480636fdfd9 | test-rebuild             | SHUTOFF | Internal=172.16.101.195                | ubuntu-focal-20.04-gui                                  | c3.small     |
+--------------------------------------+--------------------------+---------+----------------------------------------+---------------------------------------------------------+--------------+
$ openstack flavor list
+--------------------------------------+--------------+--------+------+-----------+-------+-----------+
| ID                                   | Name         |    RAM | Disk | Ephemeral | VCPUs | Is Public |
+--------------------------------------+--------------+--------+------+-----------+-------+-----------+
| 6cf0813c-1ba2-4999-b7eb-34d71a2a4199 | c3.medium    |   8192 |   40 |         0 |     4 | True      |
+--------------------------------------+--------------+--------+------+-----------+-------+-----------+

Run

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openstack server resize --flavor <falvor-id> <server-id>

Example

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$ openstack server resize --flavor 6cf0813c-1ba2-4999-b7eb-34d71a2a4199 b5acb398-76b4-48fe-9b9a-d480636fdfd9

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