How to launch an instance from a DreamCompute volume

You can boot instances from a volume instead of an image.

To complete these tasks, use these parameters on the nova boot command:

Task nova boot parameter Information
Boot an instance from an image and attach a non-bootable volume. --block-device Boot instance from image and attach non-bootable volume
Create a volume from an image and boot an instance from that volume. --block-device Create volume from image and boot instance
Boot from an existing source image, volume, or snapshot. --block-device Create volume from image and boot instance

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.

  1. Create a non-bootable volume.

    $ cinder create --display-name my-volume 8
    +--------------------------------+--------------------------------------+
    |            Property            |                Value                 |
    +--------------------------------+--------------------------------------+
    |          attachments           |                  []                  |
    |       availability_zone        |                 nova                 |
    |            bootable            |                false                 |
    |           created_at           |      2014-05-09T16:33:11.000000      |
    |          description           |                 None                 |
    |           encrypted            |                False                 |
    |               id               | d620d971-b160-4c4e-8652-2513d74e2080 |
    |            metadata            |                  {}                  |
    |              name              |              my-volume               |
    |     os-vol-host-attr:host      |                 None                 |
    | os-vol-mig-status-attr:migstat |                 None                 |
    | os-vol-mig-status-attr:name_id |                 None                 |
    |  os-vol-tenant-attr:tenant_id  |   ccef9e62b1e645df98728fb2b3076f27   |
    |              size              |                  8                   |
    |          snapshot_id           |                 None                 |
    |          source_volid          |                 None                 |
    |             status             |               creating               |
    |            user_id             |   fef060ae7bfd4024b3edb97dff59017a   |
    |          volume_type           |                 None                 |
    +--------------------------------+--------------------------------------+
    
  2. List volumes.

    $ cinder list
    +-----------------+-----------+-----------+------+-------------+----------+-------------+
    |       ID        |   Status  |    Name   | Size | Volume Type | Bootable | Attached to |
    +-----------------+-----------+-----------+------+-------------+----------+-------------+
    | d620d971-b16... | available | my-volume |  8   |     None    |  false   |             |
    +-----------------+-----------+-----------+------+-------------+----------+-------------+
    
  3. Boot an instance from an image and attach the empty volume to the instance.

    $ nova boot --flavor 100 --image 98901246-af91-43d8-b5e6-a4506aa8f369 \
      --block-device source=volume,id=d620d971-b160-4c4e-8652-2513d74e2080,dest=volume,shutdown=preserve \
      myInstanceWithVolume
    +--------------------------------------+--------------------------------------------+
    | Property                             | 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                               | gp1.subsonic (100)                         |
    | 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

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.

  1. List the available images.

    $ nova image-list
    +-----------------+---------------------------------+--------+--------+
    | ID              | Name                            | Status | Server |
    +-----------------+---------------------------------+--------+--------+
    | 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.

  2. List the available flavors.

    $ nova flavor-list
    +-----+----------------+-----------+------+-----------+------+-------+-------------+-----------+
    | ID  | Name           | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
    +-----+----------------+-----------+------+-----------+------+-------+-------------+-----------+
    | 100 | gp1.subsonic   | 1024      | 80   | 0         |      | 1     | 1.0         | True      |
    | 200 | gp1.supersonic | 2048      | 80   | 0         |      | 1     | 1.0         | True      |
    | 300 | gp1.lightspeed | 4096      | 80   | 0         |      | 2     | 1.0         | True      |
    | 400 | gp1.warpspeed  | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
    | 50  | gp1.semisonic  | 512       | 80   | 0         |      | 1     | 1.0         | True      |
    | 500 | gp1.hyperspeed | 16384     | 80   | 0         |      | 8     | 1.0         | True      |
    +-----+----------------+-----------+------+-----------+------+-------+-------------+-----------+
    

    Note the ID of the flavor that you want to use to create a volume.

  3. To create a bootable volume from an image and launch an instance from this volume, use the --block-device parameter.

    For example:

    $ nova boot --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.

  4. Create a bootable volume from an image, before the instance boots. The volume is not deleted when the instance is terminated.

    $ nova boot --flavor 2 \
      --block-device source=image,id=484e05af-a14d-4567-812b-28122d1c2260,dest=volume,size=10,shutdown=preserve,bootindex=0 \
      myInstanceFromVolume
    +--------------------------------------+--------------------------------+
    | Property                             | 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 | []                             |
    | metadata                             | {}                             |
    +--------------------------------------+--------------------------------+
    
  5. List volumes to see the bootable volume and its attached myInstanceFromVolume instance.

    $ cinder list
    +-------------+--------+--------------+------+-------------+----------+-------------+
    |      ID     | Status | Display Name | Size | Volume Type | Bootable | Attached to |
    +-------------+--------+--------------+------+-------------+----------+-------------+
    | 2fff50ab... | in-use |              |  10  |     None    |   true   | 2e65c854... |
    +-------------+--------+--------------+------+-------------+----------+-------------+
    

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