Detaching volumes from an instance

Ordinarily, Cinder volumes can only be attached to one instance at a time. Thus, you need to detach it from one instance before attaching it to another. To detach a volume, we will use another OpenStack client command called openstack server remove volume.

Getting ready

To detach a volume from an instance, you will need the following:

• The openstack command-line client

• An openrc file with appropriate credentials for the environment

• The name or ID of the volume to detach

• The name or ID of the instance to detach the volume from

For our example, these values are as follows:

• Volume: cookbook.volume

• Instance: cookbook.test

• Mount point: /mnt1

How to do it...

Carry out the following steps to detach a volume to an instance using the openstack client:

1. List running instances to get the ID of our instance:

   

2. List the volumes that are available and in-use in our environment:

   openstack volume list
   

   This will bring back an output like the following. Note that the information provided...