4.3 KiB
Glance based cinder volume protection plugin
https://blueprints.launchpad.net/karbor/+spec/backup-volume-data-to-bank
Problem description
Currently, karbor support using cinder backup, cinder snapshot and freezer plugins to do cinder volume backup. These plugins all store the backup metadata to the bank but not the volume backup data.
In the use case of cross site, we need to do cinder volume backup and restore cross different sites (with different cinder/nova/glance service endpoints), this requires karbor to save the volume data in an independent storage media (bank), so that we can do backup in one site and do restore in another site that the two sites use the same volume backup data in one bank.
Obviously the cinder volume protection plugins in karbor can not satisfy the cross site needs now. So we should introduce a new volume protection plugin which can save volume data to karbor's bank, like image protection plugin. Backup cinder volume through glance may be a valid choice.
Use Cases
As explained, users who want to do cross site backup and restore of cinder volumes.
Proposed change
Volume glance protection plugin
Add a new volume protection plugin which do the backup and restore of cinder volumes by glance service. Volume data would be stored in the bank as chunks like what image protection plugin do.
Steps of protect operation: 1. Create a temporary snapshot to the volume you want to backup 2. Create a temporary volume based on the snapshot in step 1 3. Create a temporary glance image of the temporary volume 4. Download the temporary image and save it to karbor bank 5. Clean all the temporary resources in step 1 to 4 6. Save the backup metadata to bank
Steps of restore operation: 1. Create an image with the volume data in bank 2. Create a volume with the created image in step 1 3. Wait for the volume status being available 4. Clean the created image in step 1
Steps in delete operation: 1. List and delete the objects (volume data and metadata) in bank.
Volume glance protection plugin schema:
OPTIONS_SCHEMA = {
"title": "Volume Glance Protection Options",
"type": "object",
"properties": {
"backup_name": {
"type": "string",
"title": "Backup Name",
"description": "The name of the backup.",
"default": None
},
"description": {
"type": "string",
"title": "Description",
"description": "The description of the backup."
}
},
"required": ["backup_name"]
}
RESTORE_SCHEMA = {
"title": "Volume Glance Protection Restore",
"type": "object",
"properties": {
"restore_name": {
"type": "string",
"title": "Restore Resource Name",
"description": "The name of the restore resource ",
"default": None
},
},
"required": ["restore_name"]
}
Alternatives
None
Data model impact
None.
REST API impact
None
Security impact
None
Notifications impact
None
Other end user impact
None
Performance Impact
This plugin may be slower than cinder backup and cinder snapshot plugin.
Other deployer impact
Add the volume by glance protection plugin endpoint to setup.cfg. Add the volume by glance protection plugin configuration to provider file.
Developer impact
None
Implementation
Assignee(s)
Primary assignee: Pengju Jiao <jiaopengju@cmss.chinamobile.com>
Work Items
- Write volume by glance protection plugin
- Write tests
Dependencies
None
Testing
Unit tests in Karbor.
Documentation Impact
Add a usage example about volume by glance protection.
References
None