What's this?
- Take a snapshot of Nova instance
- Restore from the snapshot (= Create new Nova instance)
Take a snapshot 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 snapshot
# nova image-create --poll admin_vm01 admin_vm01_ss
Server snapshotting... 100% complete
Finished
# nova help image-create
usage: nova image-create [--show] [--poll] <server> <name>
Create a new image by taking a snapshot of a running server.
Positional arguments:
<server> Name or ID of server.
<name> Name of snapshot.
Optional arguments:
--show Print image info.
--poll Blocks while server snapshots so progress can be reported.
Check the snapshot
# nova image-list | egrep "ID|admin_vm01_ss"
| ID | Name | Status | Server |
| 88648405-a9f5-40ae-bfb0-0ff2d7608258 | admin_vm01_ss | ACTIVE | 7961383e-7528-4e26-8889-ab452bae0e7f |
# glance image-list | egrep "ID|admin_vm01_ss"
| ID | Name | Disk Format | Container Format | Size | Status |
| 88648405-a9f5-40ae-bfb0-0ff2d7608258 | admin_vm01_ss | raw | bare | 1073741824 | active |
# glance image-show admin_vm01_ss
+---------------------------------------+--------------------------------------+
| Property | Value |
+---------------------------------------+--------------------------------------+
| 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' | snapshot |
| 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 | 1fdf144151c4cb2350dbd6955576dcf9 |
| container_format | bare |
| created_at | 2015-02-17T02:45:33 |
| deleted | False |
| disk_format | raw |
| id | 88648405-a9f5-40ae-bfb0-0ff2d7608258 |
| is_public | False |
| min_disk | 1 |
| min_ram | 0 |
| name | admin_vm01_ss |
| owner | a8085d1871f847bdb906ef4a28d1bd48 |
| protected | False |
| size | 1073741824 |
| status | active |
| updated_at | 2015-02-17T02:46:26 |
+---------------------------------------+--------------------------------------+
Restore from the snapshot (= Create new Nova instance)
Check necessary information
# 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 |
# nova secgroup-list
+--------------------------------------+---------+-------------+
| Id | Name | Description |
+--------------------------------------+---------+-------------+
| 319b5bc2-5df2-44c1-b2d9-8d08689e4a8a | default | default |
+--------------------------------------+---------+-------------+
# 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(snapshot) (= Create new Nova instance)
# nova boot --flavor m1.nano \
--image admin_vm01_ss \
--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_ss (88648405-a9f5-40ae-bfb0-0ff2d7608258) |
| 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
