What's this?

Take a backup of Nova instance
Restore from the backup (= Create new Nova instance)

Take a backup of Nova instance

Initial state

# nova list
+--------------------------------------+------------+--------+------------+-------------+---------------------+
| ID                                   | Name       | Status | Task State | Power State | Networks            |
+--------------------------------------+------------+--------+------------+-------------+---------------------+
| 7961383e-7528-4e26-8889-ab452bae0e7f | admin_vm01 | ACTIVE | -          | Running     | net04=192.168.12.78 |
+--------------------------------------+------------+--------+------------+-------------+---------------------+

Take a backup (1st)

# nova backup admin_vm01 admin_vm01_bkup daily 1


# nova help backup
usage: nova backup <server> <name> <backup-type> <rotation>

Backup a server by creating a 'backup' type snapshot.

Positional arguments:
  <server>       Name or ID of server.
  <name>         Name of the backup image.
  <backup-type>  The backup type, like "daily" or "weekly".
  <rotation>     Int parameter representing how many backups to keep around.

Note:

<backup-type> is kind of TAG
<rotation> is How many backups you want to keep
Nova backup is not automatically backup function, it is just how many backups with having same TAG you want to keep.

Check the backup

Nova command

# nova image-list | egrep "ID|admin_vm01_bkup"
| ID                                   | Name                                     | Status | Server                               |
| 9b641354-3875-49c5-9cc0-3b722791ccab | admin_vm01_bkup                          | ACTIVE | 7961383e-7528-4e26-8889-ab452bae0e7f |

Glance command

# glance image-list | egrep "ID|admin_vm01_bkup"
| ID                                   | Name                                     | Disk Format | Container Format | Size       | Status |
| 9b641354-3875-49c5-9cc0-3b722791ccab | admin_vm01_bkup                          | raw         | bare             | 1073741824 | active |

# glance image-show admin_vm01_bkup
+---------------------------------------+--------------------------------------+
| Property                              | Value                                |
+---------------------------------------+--------------------------------------+
| Property 'backup_type'                | daily                                |
| Property 'base_image_ref'             | a5232547-4ccf-4ebb-9ab8-79e4daf73e9d |
| Property 'description'                | cirros-changed-password              |
| Property 'image_location'             | snapshot                             |
| Property 'image_state'                | available                            |
| Property 'image_type'                 | backup                               |
| Property 'instance_type_ephemeral_gb' | 0                                    |
| Property 'instance_type_flavorid'     | 318a3051-4304-4f3a-bda7-6f3a7637152b |
| Property 'instance_type_id'           | 2                                    |
| Property 'instance_type_memory_mb'    | 256                                  |
| Property 'instance_type_name'         | m1.nano                              |
| Property 'instance_type_root_gb'      | 1                                    |
| Property 'instance_type_rxtx_factor'  | 1.0                                  |
| Property 'instance_type_swap'         | 0                                    |
| Property 'instance_type_vcpus'        | 1                                    |
| Property 'instance_uuid'              | 7961383e-7528-4e26-8889-ab452bae0e7f |
| Property 'network_allocated'          | True                                 |
| Property 'owner_id'                   | a8085d1871f847bdb906ef4a28d1bd48     |
| Property 'user_id'                    | a1c2ec19759040e39f219fcf82028bf6     |
| checksum                              | 070cf4308133712b8711fa797a0d1f5f     |
| container_format                      | bare                                 |
| created_at                            | 2015-02-17T03:17:26                  |
| deleted                               | False                                |
| disk_format                           | raw                                  |
| id                                    | 9b641354-3875-49c5-9cc0-3b722791ccab |
| is_public                             | False                                |
| min_disk                              | 1                                    |
| min_ram                               | 0                                    |
| name                                  | admin_vm01_bkup                      |
| owner                                 | a8085d1871f847bdb906ef4a28d1bd48     |
| protected                             | False                                |
| size                                  | 1073741824                           |
| status                                | active                               |
| updated_at                            | 2015-02-17T03:18:19                  |
+---------------------------------------+--------------------------------------+

Take a backup (2nd)

# nova backup admin_vm01 admin_vm01_bkup daily 1


# nova help backup
usage: nova backup <server> <name> <backup-type> <rotation>

Backup a server by creating a 'backup' type snapshot.

Positional arguments:
  <server>       Name or ID of server.
  <name>         Name of the backup image.
  <backup-type>  The backup type, like "daily" or "weekly".
  <rotation>     Int parameter representing how many backups to keep around.

Note:

<backup-type> is kind of TAG
<rotation> is How many backups you want to keep
Nova backup is not automatically backup function, it is just how many backups with having same TAG you want to keep.

Check the backup

Being Backup

Once the backup has been completed. 1st backup (9b641354-3875-49c5-9cc0-3b722791ccab) will be deleted. Because <rotation> is set "1".

    # glance image-list
    +--------------------------------------+------------------------------------------+-------------+------------------+------------+--------+
    | ID                                   | Name                                     | Disk Format | Container Format | Size       | Status |
    +--------------------------------------+------------------------------------------+-------------+------------------+------------+--------+
    | 9b641354-3875-49c5-9cc0-3b722791ccab | admin_vm01_bkup                          | raw         | bare             | 1073741824 | active |
    | 7cd46251-edbd-444b-a34f-8369420b40ce | admin_vm01_bkup                          | raw         | bare             |            | queued |
    +--------------------------------------+------------------------------------------+-------------+------------------+------------+--------+

Complete

1st backup (9b641354-3875-49c5-9cc0-3b722791ccab) has been deleted.

    # glance image-list
    +--------------------------------------+------------------------------------------+-------------+------------------+------------+--------+
    | ID                                   | Name                                     | Disk Format | Container Format | Size       | Status |
    +--------------------------------------+------------------------------------------+-------------+------------------+------------+--------+
    | 7cd46251-edbd-444b-a34f-8369420b40ce | admin_vm01_bkup                          | raw         | bare             | 1073741824 | active |
    +--------------------------------------+------------------------------------------+-------------+------------------+------------+--------+

Restore from the backup (= Create new Nova instance)

Check necessary infomation

Network

# neutron net-list | egrep " id |net04"
| id                                   | name           | subnets                                               |
| b3fa9d4d-4c21-47f5-be07-cf2ff518035e | net04          | 77267538-9be9-47db-a983-9139de4efe50 192.168.12.0/24  |

Security Group

# nova secgroup-list
+--------------------------------------+---------+-------------+
| Id                                   | Name    | Description |
+--------------------------------------+---------+-------------+
| 319b5bc2-5df2-44c1-b2d9-8d08689e4a8a | default | default     |
+--------------------------------------+---------+-------------+

Flavor

# nova flavor-list
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| ID                                   | Name          | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| 1                                    | m1.tiny       | 512       | 1    | 0         |      | 1     | 1.0         | True      |
| 12d7efd2-2d1d-44ec-ad66-ce7ca8927c0b | m1.medium     | 4096      | 0    | 0         |      | 2     | 1.0         | True      |
| 2                                    | m1.small      | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 318a3051-4304-4f3a-bda7-6f3a7637152b | m1.nano       | 256       | 1    | 0         |      | 1     | 1.0         | True      |
| 4                                    | m1.large      | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 5                                    | m1.xlarge     | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+

Restore from the image(backup) (= Create new Nova instance)

# nova boot --flavor m1.nano \
            --image admin_vm01_bkup \
            --security-groups default \
            --availability-zone nova \
            --nic net-id=b3fa9d4d-4c21-47f5-be07-cf2ff518035e \
            admin_vm02
+--------------------------------------+--------------------------------------------------------+
| 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-00000444                                      |
| 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                            | Df9gLcC7nkHq                                           |
| config_drive                         |                                                        |
| created                              | 2015-02-17T03:02:25Z                                   |
| flavor                               | m1.nano (318a3051-4304-4f3a-bda7-6f3a7637152b)         |
| hostId                               |                                                        |
| id                                   | 94c75110-54a7-408a-b7e6-13b6961617bf                   |
| image                                | admin_vm01_bkup (7cd46251-edbd-444b-a34f-8369420b40ce) |
| key_name                             | -                                                      |
| metadata                             | {}                                                     |
| name                                 | admin_vm02                                             |
| os-extended-volumes:volumes_attached | []                                                     |
| progress                             | 0                                                      |
| security_groups                      | default                                                |
| status                               | BUILD                                                  |
| tenant_id                            | a8085d1871f847bdb906ef4a28d1bd48                       |
| updated                              | 2015-02-17T03:02:25Z                                   |
| user_id                              | a1c2ec19759040e39f219fcf82028bf6                       |
+--------------------------------------+--------------------------------------------------------+

Check the restored Nova instance

# nova list
+--------------------------------------+------------+--------+------------+-------------+---------------------+
| ID                                   | Name       | Status | Task State | Power State | Networks            |
+--------------------------------------+------------+--------+------------+-------------+---------------------+
| 7961383e-7528-4e26-8889-ab452bae0e7f | admin_vm01 | ACTIVE | -          | Running     | net04=192.168.12.78 |
| 94c75110-54a7-408a-b7e6-13b6961617bf | admin_vm02 | ACTIVE | -          | Running     | net04=192.168.12.79 |
+--------------------------------------+------------+--------+------------+-------------+---------------------+

Environment

Openstack : Juno
Ceph : Firefly

Reference

Nova Snapshot/Restore
Nova Backup/Restore