Manage volumes
A volume is a detachable block storage device, similar to a
USB hard drive. You can attach a volume to only one instance.
To create and manage volumes, you use a combination of nova
and cinder client commands.
This example creates a volume named
my-new-volume based on an image.
Create a volume
List images, and note the ID of the image to use for
your volume:
$ nova image-list
+--------------------------------------+---------------------------------+--------+--------------------------------------+
| ID | Name | Status | Server |
+--------------------------------------+---------------------------------+--------+--------------------------------------+
| 397e713c-b95b-4186-ad46-6126863ea0a9 | cirros-0.3.1-x86_64-uec | ACTIVE | |
| df430cc2-3406-4061-b635-a51c16e488ac | cirros-0.3.1-x86_64-uec-kernel | ACTIVE | |
| 3cf852bd-2332-48f4-9ae4-7d926d50945e | cirros-0.3.1-x86_64-uec-ramdisk | ACTIVE | |
| 7e5142af-1253-4634-bcc6-89482c5f2e8a | myCirrosImage | ACTIVE | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 |
| 89bcd424-9d15-4723-95ec-61540e8a1979 | mysnapshot | ACTIVE | f51ebd07-c33d-4951-8722-1df6aa8afaa4 |
+--------------------------------------+---------------------------------+--------+--------------------------------------+
List the availability zones, and note the ID of the
availability zone in which to create your
volume:
$ nova availability-zone-list
+-----------------------+----------------------------------------+
| Name | Status |
+-----------------------+----------------------------------------+
| internal | available |
| |- devstack-grizzly | |
| | |- nova-conductor | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-consoleauth | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-scheduler | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-cert | enabled :-) 2013-07-25T16:50:44.000000 |
| | |- nova-network | enabled :-) 2013-07-25T16:50:44.000000 |
| nova | available |
| |- devstack-grizzly | |
| | |- nova-compute | enabled :-) 2013-07-25T16:50:39.000000 |
+-----------------------+----------------------------------------+
Create a volume with 8 GBs of space. Specify the
availability zone and image, as follows:
$ cinder create 8 --display-name my-new-volume --image-id 397e713c-b95b-4186-ad46-6126863ea0a9 --availability-zone nova
+---------------------+--------------------------------------+
| Property | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2013-07-25T17:02:12.472269 |
| display_description | None |
| display_name | my-new-volume |
| id | 573e024d-5235-49ce-8332-be1576d323f8 |
| image_id | 397e713c-b95b-4186-ad46-6126863ea0a9 |
| metadata | {} |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| volume_type | None |
+---------------------+--------------------------------------+
To verify that your volume was created successfully,
list the available volumes:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 573e024d-5235-49ce-8332-be1576d323f8 | available | my-new-volume | 8 | None | true | |
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
If your volume was created successfully, its status
is available. If its status is
error, you might have
exceeded your quota.
Attach a volume to an instance
Attach your volume to a server:
$ nova volume-attach 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 573e024d-5235-49ce-8332-be1576d323f8 /dev/vdb
+----------+--------------------------------------+
| Property | Value |
+----------+--------------------------------------+
| device | /dev/vdb |
| serverId | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 |
| id | 573e024d-5235-49ce-8332-be1576d323f8 |
| volumeId | 573e024d-5235-49ce-8332-be1576d323f8 |
+----------+--------------------------------------+
Note the ID of your volume.
Show information for your volume:
$ cinder show 573e024d-5235-49ce-8332-be1576d323f8
+------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| attachments | [{u'device': u'/dev/vdb', u'server_id': u'84c6e57d-a6b1-44b6-81eb-fcb36afd31b5', u'id': u'573e024d-5235-49ce-8332-be1576d323f8', u'volume_id': u'573e024d-5235-49ce-8332-be1576d323f8'}] |
| availability_zone | nova |
| bootable | true |
| created_at | 2013-07-25T17:02:12.000000 |
| display_description | None |
| display_name | my-new-volume |
| id | 573e024d-5235-49ce-8332-be1576d323f8 |
| metadata | {} |
| os-vol-host-attr:host | devstack-grizzly |
| os-vol-tenant-attr:tenant_id | 66265572db174a7aa66eba661f58eb9e |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | in-use |
| volume_image_metadata | {u'kernel_id': u'df430cc2-3406-4061-b635-a51c16e488ac', u'image_id': u'397e713c-b95b-4186-ad46-6126863ea0a9', u'ramdisk_id': u'3cf852bd-2332-48f4-9ae4-7d926d50945e', u'image_name': u'cirros-0.3.1-x86_64-uec'} |
| volume_type | None |
+------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
The output shows that the volume is attached to the
server with ID
84c6e57d-a6b1-44b6-81eb-fcb36afd31b5,
is in the nova availability zone, and is
bootable.
Delete a volume
To delete your volume, you must first detach it from
the server.
To detach the volume from your server, pass the
server ID and volume ID to the command, as
follows:
$ nova volume-detach 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 573e024d-5235-49ce-8332-be1576d323f8
The volume-detach command does
not return any output.
List volumes:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 573e024d-5235-49ce-8332-be1576d323f8 | available | my-new-volume | 8 | None | true | |
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
Note that the volume is now available.
Now you can delete the volume, as follows:
$ cinder delete my-new-volume
The delete command does not return any
output.
List the volumes again, and note that the status of
your volume is deleting:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| 573e024d-5235-49ce-8332-be1576d323f8 | deleting | my-new-volume | 8 | None | true | |
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
When the volume is fully deleted, it disappears from
the list of volumes:
$ cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
| bd7cf584-45de-44e3-bf7f-f7b50bf235e3 | available | my-bootable-vol | 8 | None | true | |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+