Rebuild a VM with a new image
Warning
Rebuilding Instances will result in loss of data. You should always refer to Creating Snapshots from Instance to backup your data.
OpenStack has a useful rebuild function that allows you to rebuild an instance from a fresh image while maintaining the same fixed and floating IP addresses, amongst other metadata.
Web Interface
Log-in to the STFC cloud (https://openstack.stfc.ac.uk/)
In the Web Interface, Go to Compute → Instances
Click the drop-down menu on the right-hand side (in Actions column) and select REBUILD INSTANCE
Select the image from the drop-down menu in the pop-up. Click on the REBUILD button.
The instance will be rebuilt with the new image
Command-line
Note
See Using OpenStack Command-line Interface on how to set-up the command line client.
Get the
Server ID(The VM to rebuild) and theImage ID
$ openstack image list
+--------------------------------------+----------------------------------------------------------+-------------+
| ID | Name | Status |
+--------------------------------------+----------------------------------------------------------+-------------+
| ae4a8e18-627c-484a-9909-7bd93d9e3e97 | ubuntu-focal-20.04-gui | active |
+--------------------------------------+----------------------------------------------------------+-------------+
$ openstack server list
+--------------------------------------+--------------------------+--------+----------------------------------------+---------------------------------------------------------+--------------+
| ID | Name | Status | Networks | Image | Flavor |
+--------------------------------------+--------------------------+--------+----------------------------------------+---------------------------------------------------------+--------------+
| b5acb398-76b4-48fe-9b9a-d480636fdfd9 | test-rebuild | ACTIVE | Internal=172.16.101.195 | scientificlinux-7-nogui | c3.small |
+--------------------------------------+--------------------------+--------+----------------------------------------+---------------------------------------------------------+--------------+
Run
openstack server rebuild --image <image-id> <server-id>
Example
$ openstack server rebuild --image ae4a8e18-627c-484a-9909-7bd93d9e3e97 b5acb398-76b4-48fe-9b9a-d480636fdfd9
+-------------------+------------------------------------------------------------------+
| Field | Value |
+-------------------+------------------------------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| accessIPv4 | |
| accessIPv6 | |
| addresses | Internal=172.16.101.195 |
| adminPass | yoTq5HDrhH6a |
| created | 2021-12-03T10:31:27Z |
| flavor | c3.small (026ace2c-5247-4bdc-8929-81d129cc69bf) |
| hostId | ff3c5830640867370bd8fb9228356baee63ff24e5baa381e41798dc9 |
| id | b5acb398-76b4-48fe-9b9a-d480636fdfd9 |
| image | ubuntu-focal-20.04-gui (ae4a8e18-627c-484a-9909-7bd93d9e3e97) |
| name | test-rebuild |
| progress | 0 |
| project_id | 80ab2bd11e5f46bf96bf47658d07499d |
| properties | |
| status | REBUILD |
| updated | 2021-12-03T10:57:41Z |
| user_id | 3ae4ecf4b9e0e66260b7aaebc2cc98aac3c95221e42f1cb49113ed751d8b9f2c |
+-------------------+------------------------------------------------------------------+