How to extend a bootable volume using Openstack CLI

The tutorial only applies to Fuga Cloud release 2 and was tested with OpenStack CLI version 3.19.0


In this tutorial, we will show you how to increase the size of your (bootable) volume.


STEP 1: Volume ID

In order to extend the volume storage, we need to know the volume ID. You can look it up using the following command.

openstack volume list

STEP 2: Extend (bootable) volume

Now, let’s extend our volume to 100GB using the Cinder API. This only works with a specific version of the Cinder API, we will force the version of it in the command. Replace the <volume-id> with that of your own.

OS_VOLUME_API_VERSION=3.42 cinder extend <volume-id> 100

STEP 3: Stop and restart

To let your instance know that you have more disk space available on your volume, you have to shut down the machine and start it again, a restart will not do it.

openstack server stop <server-name>
openstack server start <server-name>

That's it, to confirm that your operating system sees the new volume size you can log in using SSH and use the list block device command:



You have now extended the bootable volume of your instance using the OpenStack CLI tools.