Create an image (nova)You can use the nova client to take a snapshot of a
running instance to create an image.To minimize the potential for data loss and ensure that you create an
accurate image, you should shut down the instance before you take a
snapshot.You cannot create a snapshot from an instance that has an attached
volume. Detach the volume, create the image, and remount the
volume.Write any buffered data to disk.For more information, see Taking Snapshots in the
OpenStack Operations
Guide.List instances to get the server name:$nova list+--------------------------------------+----------------------+--------+------------+-------------+------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+----------------------+--------+------------+-------------+------------------+
| 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 | myCirrosServer | ACTIVE | None | Running | private=10.0.0.3 |
+--------------------------------------+----------------------+--------+------------+-------------+------------------+In this example, the server is named
myCirrosServer.Use this server to create a snapshot:
$nova image-create myCirrosServer myCirrosImageThe
command creates a qemu snapshot and automatically uploads the
image to your repository. Only the tenant that creates the image
has access to it.Get details for your image to check its status:$nova image-show myCirrosImage+-------------------------------------+--------------------------------------+
| Property | Value |
+-------------------------------------+--------------------------------------+
| metadata owner_id | 66265572db174a7aa66eba661f58eb9e |
| minDisk | 0 |
| metadata instance_type_name | m1.small |
| metadata instance_type_id | 5 |
| metadata instance_type_memory_mb | 2048 |
| id | 7e5142af-1253-4634-bcc6-89482c5f2e8a |
| metadata instance_type_root_gb | 20 |
| metadata instance_type_rxtx_factor | 1 |
| metadata ramdisk_id | 3cf852bd-2332-48f4-9ae4-7d926d50945e |
| metadata image_state | available |
| metadata image_location | snapshot |
| minRam | 0 |
| metadata instance_type_vcpus | 1 |
| status | ACTIVE |
| updated | 2013-07-22T19:46:42Z |
| metadata instance_type_swap | 0 |
| metadata instance_type_vcpu_weight | None |
| metadata base_image_ref | 397e713c-b95b-4186-ad46-6126863ea0a9 |
| progress | 100 |
| metadata instance_type_flavorid | 2 |
| OS-EXT-IMG-SIZE:size | 14221312 |
| metadata image_type | snapshot |
| metadata user_id | 376744b5910b4b4da7d8e6cb483b06a8 |
| name | myCirrosImage |
| created | 2013-07-22T19:45:58Z |
| metadata instance_uuid | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 |
| server | 84c6e57d-a6b1-44b6-81eb-fcb36afd31b5 |
| metadata kernel_id | df430cc2-3406-4061-b635-a51c16e488ac |
| metadata instance_type_ephemeral_gb | 0 |
+-------------------------------------+--------------------------------------+The image status changes from
SAVING to
ACTIVE. Only the tenant who
creates the image has access to it.To launch an instance from your image, include the image ID
and flavor ID, as in the following example:$nova boot newServer --image 7e5142af-1253-4634-bcc6-89482c5f2e8a \
--flavor 3+-------------------------------------+--------------------------------------+
| Property | Value |
+-------------------------------------+--------------------------------------+
| OS-EXT-STS:task_state | scheduling |
| image | myCirrosImage |
| OS-EXT-STS:vm_state | building |
| OS-EXT-SRV-ATTR:instance_name | instance-00000007 |
| flavor | m1.medium |
| id | d7efd3e4-d375-46d1-9d57-372b6e4bdb7f |
| security_groups | [{u'name': u'default'}] |
| user_id | 376744b5910b4b4da7d8e6cb483b06a8 |
| 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 | 2013-07-22T19:58:33Z |
| hostId | |
| OS-EXT-SRV-ATTR:host | None |
| key_name | None |
| OS-EXT-SRV-ATTR:hypervisor_hostname | None |
| name | newServer |
| adminPass | jis88nN46RGP |
| tenant_id | 66265572db174a7aa66eba661f58eb9e |
| created | 2013-07-22T19:58:33Z |
| metadata | {} |
+-------------------------------------+--------------------------------------+