Create a volume
Pre-requisities
- Create a virtual machine
Creating a volume
This allows an arbitrary sized disk to be attached to your virtual machine, like plugging in a USB stick. The steps below create a disk of 20GB.
$ openstack volume create --size 20 my-volume
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2014-09-29T09:38:04.837127 |
| display_description | None |
| display_name | my-volume |
| encrypted | False |
| id | cfd4040d-197a-4c47-9131-45b88521594c |
| properties | |
| size | 20 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| type | standard |
+---------------------+--------------------------------------+
The volume can be checked using volume list.
$ openstack volume list
+--------------------------------------+----------------+-----------+------+----------+
| ID | Display Name | Status | Size | Attached |
+--------------------------------------+----------------+-----------+------+----------+
| cf6bc40d-147a-4c47-9131-45b88521594c | my-vm | available | 20 | |
+--------------------------------------+----------------+-----------+------+----------+
Attaching the volume to a VM
Once the status is created, it can be attached to a virtual machine. The following command attaches the volume my-volume
to the virtual machine my-vm
openstack server add volume my-vm my-volume
Logging into the VM, this can be seen in /proc/partitions as an additional disk
# cat /proc/partitions
major minor #blocks name
252 0 20971520 vda
252 1 409600 vda1
252 2 10075136 vda2
253 0 1572864 dm-0
253 1 8486912 dm-1
252 16 20971520 vdb
and then formatted and mounted:
# mkfs -t ext4 /dev/vdb
# mount /dev/vdb /mnt
# df -H
Filesystem Size Used Avail Use% Mounted on
...
/dev/vdb 22G 181M 20G 1% /mnt
Last update: December 3, 2021