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================================
Launch an instance from a volume
================================
You can boot instances from a volume instead of an image.
To complete these tasks, use these parameters on the
:command:`openstack server create` command:
.. list-table::
:header-rows: 1
:widths: 30 10 30
* - Task
- nova boot parameter
- Information
* - Boot an instance from an image and attach a non-bootable
volume.
- ``--block-device``
- :ref:`Boot_instance_from_image_and_attach_non-bootable_volume`
* - Create a volume from an image and boot an instance from that
volume.
- ``--block-device``
- :ref:`Create_volume_from_image_and_boot_instance`
* - Boot from an existing source image, volume, or snapshot.
- ``--block-device``
- :ref:`Create_volume_from_image_and_boot_instance`
* - Attach a swap disk to an instance.
- ``--swap``
- :ref:`Attach_swap_or_ephemeral_disk_to_an_instance`
* - Attach an ephemeral disk to an instance.
- ``--ephemeral``
- :ref:`Attach_swap_or_ephemeral_disk_to_an_instance`
.. note::
To attach a volume to a running instance, see
:ref:`Attach_a_volume_to_an_instance`.
.. _Boot_instance_from_image_and_attach_non-bootable_volume:
Boot instance from image and attach non-bootable volume
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Create a non-bootable volume and attach that volume to an instance that
you boot from an image.
To create a non-bootable volume, do not create it from an image. The
volume must be entirely empty with no partition table and no file
system.
#. Create a non-bootable volume.
.. code-block:: console
$ openstack volume create --size 8 my-volume
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| consistencygroup_id | None |
| created_at | 2016-11-25T10:37:08.850997 |
| description | None |
| encrypted | False |
| id | b8f7bbec-6274-4cd7-90e7-60916a5e75d4 |
| migration_status | None |
| multiattach | False |
| name | my-volume |
| properties | |
| replication_status | disabled |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| type | None |
| updated_at | None |
| user_id | 0678735e449149b0a42076e12dd54e28 |
+---------------------+--------------------------------------+
#. List volumes.
.. code-block:: console
$ openstack volume list
+--------------------------------------+--------------+-----------+------+-------------+
| ID | Display Name | Status | Size | Attached to |
+--------------------------------------+--------------+-----------+------+-------------+
| b8f7bbec-6274-4cd7-90e7-60916a5e75d4 | my-volume | available | 8 | |
+--------------------------------------+--------------+-----------+------+-------------+
#. Boot an instance from an image and attach the empty volume to the
instance.
.. code-block:: console
$ openstack server create --flavor 2 --image 98901246-af91-43d8-b5e6-a4506aa8f369 \
--block-device source=volume,id=d620d971-b160-4c4e-8652-2513d74e2080,dest=volume,shutdown=preserve \
myInstanceWithVolume
+--------------------------------------+--------------------------------------------+
| Field | Value |
+--------------------------------------+--------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-SRV-ATTR:host | - |
| OS-EXT-SRV-ATTR:hypervisor_hostname | - |
| OS-EXT-SRV-ATTR:instance_name | instance-00000004 |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | scheduling |
| OS-EXT-STS:vm_state | building |
| OS-SRV-USG:launched_at | - |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| adminPass | ZaiYeC8iucgU |
| config_drive | |
| created | 2014-05-09T16:34:50Z |
| flavor | m1.small (2) |
| hostId | |
| id | 1e1797f3-1662-49ff-ae8c-a77e82ee1571 |
| image | cirros-0.3.1-x86_64-uec (98901246-af91-... |
| key_name | - |
| metadata | {} |
| name | myInstanceWithVolume |
| os-extended-volumes:volumes_attached | [{"id": "d620d971-b160-4c4e-8652-2513d7... |
| progress | 0 |
| security_groups | default |
| status | BUILD |
| tenant_id | ccef9e62b1e645df98728fb2b3076f27 |
| updated | 2014-05-09T16:34:51Z |
| user_id | fef060ae7bfd4024b3edb97dff59017a |
+--------------------------------------+--------------------------------------------+
.. _Create_volume_from_image_and_boot_instance:
Create volume from image and boot instance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You can create a volume from an existing image, volume, or snapshot.
This procedure shows you how to create a volume from an image, and use
the volume to boot an instance.
#. List the available images.
.. code-block:: console
$ openstack image list
+-----------------+---------------------------------+--------+
| ID | Name | Status |
+-----------------+---------------------------------+--------+
| 484e05af-a14... | Fedora-x86_64-20-20131211.1-sda | active |
| 98901246-af9... | cirros-0.3.1-x86_64-uec | active |
| b6e95589-7eb... | cirros-0.3.1-x86_64-uec-kernel | active |
| c90893ea-e73... | cirros-0.3.1-x86_64-uec-ramdisk | active |
+-----------------+---------------------------------+--------+
Note the ID of the image that you want to use to create a volume.
If you want to create a volume to a specific storage backend, you need
to use an image which has *cinder_img_volume_type* property.
In this case, a new volume will be created as *storage_backend1* volume
type.
.. code-block:: console
$ openstack image show 98901246-af9...
+------------------+------------------------------------------------------+
| Field | Value |
+------------------+------------------------------------------------------+
| checksum | ee1eca47dc88f4879d8a229cc70a07c6 |
| container_format | bare |
| created_at | 2016-10-08T14:59:05Z |
| disk_format | qcow2 |
| file | /v2/images/9fef3b2d-c35d-4b61-bea8-09cc6dc41829/file |
| id | 98901246-af9d-4b61-bea8-09cc6dc41829 |
| min_disk | 0 |
| min_ram | 0 |
| name | cirros-0.3.4-x86_64-uec |
| owner | 8d8ef3cdf2b54c25831cbb409ad9ae86 |
| protected | False |
| schema | /v2/schemas/image |
| size | 13287936 |
| status | active |
| tags | |
| updated_at | 2016-10-19T09:12:52Z |
| virtual_size | None |
| visibility | public |
+------------------+------------------------------------------------------+
#. List the available flavors.
.. code-block:: console
$ openstack flavor list
+-----+-----------+-------+------+-----------+-------+-----------+
| ID | Name | RAM | Disk | Ephemeral | VCPUs | Is_Public |
+-----+-----------+-------+------+-----------+-------+-----------+
| 1 | m1.tiny | 512 | 1 | 0 | 1 | True |
| 2 | m1.small | 2048 | 20 | 0 | 1 | True |
| 3 | m1.medium | 4096 | 40 | 0 | 2 | True |
| 4 | m1.large | 8192 | 80 | 0 | 4 | True |
| 5 | m1.xlarge | 16384 | 160 | 0 | 8 | True |
+-----+-----------+-------+------+-----------+-------+-----------+
Note the ID of the flavor that you want to use to create a volume.
#. To create a bootable volume from an image and launch an instance from
this volume, use the ``--block-device`` parameter.
For example:
.. code-block:: console
$ openstack server create --flavor FLAVOR --block-device \
source=SOURCE,id=ID,dest=DEST,size=SIZE,shutdown=PRESERVE,bootindex=INDEX \
NAME
The parameters are:
- ``--flavor`` FLAVOR. The flavor ID or name.
- ``--block-device``
source=SOURCE,id=ID,dest=DEST,size=SIZE,shutdown=PRESERVE,bootindex=INDEX
**source=SOURCE**
The type of object used to create the block device. Valid values
are ``volume``, ``snapshot``, ``image``, and ``blank``.
**id=ID**
The ID of the source object.
**dest=DEST**
The type of the target virtual device. Valid values are ``volume``
and ``local``.
**size=SIZE**
The size of the volume that is created.
**shutdown={preserve\|remove}**
What to do with the volume when the instance is deleted.
``preserve`` does not delete the volume. ``remove`` deletes the
volume.
**bootindex=INDEX**
Orders the boot disks. Use ``0`` to boot from this volume.
- ``NAME``. The name for the server.
#. Create a bootable volume from an image. Cinder makes a volume bootable
when ``--image`` parameter is passed.
.. code-block:: console
$ openstack volume create --image IMAGE_ID --size SIZE_IN_GB bootable_volume
#. Create a VM from previously created bootable volume. The volume is not
deleted when the instance is terminated.
.. code-block:: console
$ openstack server create --flavor 2 --volume VOLUME_ID \
--block-device source=volume,id=$VOLUME_ID,dest=volume,size=10,shutdown=preserve,bootindex=0 \
myInstanceFromVolume
+--------------------------------------+--------------------------------+
| Field | Value |
+--------------------------------------+--------------------------------+
| OS-EXT-STS:task_state | scheduling |
| image | Attempt to boot from volume |
| | - no image supplied |
| OS-EXT-STS:vm_state | building |
| OS-EXT-SRV-ATTR:instance_name | instance-00000003 |
| OS-SRV-USG:launched_at | None |
| flavor | m1.small |
| id | 2e65c854-dba9-4f68-8f08-fe3... |
| security_groups | [{u'name': u'default'}] |
| user_id | 352b37f5c89144d4ad053413926... |
| OS-DCF:diskConfig | MANUAL |
| accessIPv4 | |
| accessIPv6 | |
| progress | 0 |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-AZ:availability_zone | nova |
| config_drive | |
| status | BUILD |
| updated | 2014-02-02T13:29:54Z |
| hostId | |
| OS-EXT-SRV-ATTR:host | None |
| OS-SRV-USG:terminated_at | None |
| key_name | None |
| OS-EXT-SRV-ATTR:hypervisor_hostname | None |
| name | myInstanceFromVolume |
| adminPass | TzjqyGsRcJo9 |
| tenant_id | f7ac731cc11f40efbc03a9f9e1d... |
| created | 2014-02-02T13:29:53Z |
| os-extended-volumes:volumes_attached | [{"id": "2fff50ab..."}] |
| metadata | {} |
+--------------------------------------+--------------------------------+
#. List volumes to see the bootable volume and its attached
``myInstanceFromVolume`` instance.
.. code-block:: console
$ openstack volume list
+---------------------+-----------------+--------+------+---------------------------------+
| ID | Display Name | Status | Size | Attached to |
+---------------------+-----------------+--------+------+---------------------------------+
| c612f739-8592-44c4- | bootable_volume | in-use | 10 | Attached to myInstanceFromVolume|
| b7d4-0fee2fe1da0c | | | | on /dev/vda |
+---------------------+-----------------+--------+------+---------------------------------+
.. _Attach_swap_or_ephemeral_disk_to_an_instance:
Attach swap or ephemeral disk to an instance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Use the nova ``boot`` ``--swap`` parameter to attach a swap disk on boot
or the nova ``boot`` ``--ephemeral`` parameter to attach an ephemeral
disk on boot. When you terminate the instance, both disks are deleted.
Boot an instance with a 512 MB swap disk and 2 GB ephemeral disk.
.. code-block:: console
$ openstack server create --flavor FLAVOR --image IMAGE_ID --swap 512 \
--ephemeral size=2 NAME
.. note::
The flavor defines the maximum swap and ephemeral disk size. You
cannot exceed these maximum values.
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